a large population of cockroaches was sprayed with an insecticide. a few of the cockroaches survived and produced a population of cockroaches that was resistant to this spray. what can best be inferred from this example?
Answers
The inference that can be drawn when a large population of cockroaches was sprayed with an insecticide where a few of the cockroaches survived and produced a population of cockroaches that was resistant to this spray is that: Individuals with favorable variations survive and reproduce.
Insecticide are the compounds that are used to get rid of the pests and insects in the crop fields or at homes. They can be organic, synthetic, inorganic or miscellaneous.
Variations are the changes in the genetic sequence of an organism. These are also called mutations. Usually the mutations are harmful but beneficial mutations can arise as well that help the population of organisms to survive better in the unfavorable conditions.
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PLEASEEE HELP!! Ill mark brainlist
How/why does the DNA separate?
Discuss porosity or pores, electricity, DNAS charge & size of DNA pieces. Highlight all the 4 terms
Answers
Electrophoresis is a technique commonly used in the lab to separate charged molecules, like DNA, according to size.
Gel electrophoresis is a technique commonly used in laboratories to separate charged molecules like DNA?, RNA? and proteins? according to their size.
Charged molecules move through a gel when an electric current is passed across it.
An electric current is applied across the gel so that one end of the gel has a positive charge and the other end has a negative charge.
The movement of charged molecules is called migration. Molecules migrate towards the opposite charge. A molecule with a negative charge will therefore be pulled towards the positive end (opposites attract!).
The gel consists of a permeable matrix, a bit like a sieve, through which molecules can travel when an electric current is passed across it.
Smaller molecules migrate through the gel more quickly and therefore travel further than larger fragments that migrate more slowly and therefore will travel a shorter distance. As a result the molecules are separated by size.
Gel electrophoresis and DNA
Electrophoresis enables you to distinguish DNA fragments of different lengths.
DNA is negatively charged, therefore, when an electric current is applied to the gel, DNA will migrate towards the positively charged electrode.
Shorter strands of DNA move more quickly through the gel than longer strands resulting in the fragments being arranged in order of size.
The use of dyes, fluorescent? tags or radioactive? labels enables the DNA on the gel to be seen after they have been separated. They will appear as bands on the gel.
A DNA marker with fragments of known lengths is usually run through the gel at the same time as the samples.
By comparing the bands of the DNA samples with those from the DNA marker, you can work out the approximate length of the DNA fragments in the samples.
How is gel electrophoresis carried out?
Preparing the gel
Agarose gels? are typically used to visualise fragments of DNA. The concentration of agarose used to make the gel depends on the size of the DNA fragments you are working with.
The higher the agarose concentration, the denser the matrix and vice versa. Smaller fragments of DNA are separated on higher concentrations of agarose whilst larger molecules require a lower concentration of agarose.
To make a gel, agarose powder is mixed with an electrophoresis buffer and heated to a high temperature until all of the agarose powder has melted.
The molten gel is then poured into a gel casting tray and a “comb” is placed at one end to make wells for the sample to be pipetted into.
Once the gel has cooled and solidified (it will now be opaque rather than clear) the comb is removed.
Many people now use pre-made gels.
The gel is then placed into an electrophoresis tank and electrophoresis buffer is poured into the tank until the surface of the gel is covered. The buffer conducts the electric current. The type of buffer used depends on the approximate size of the DNA fragments in the sample.
Preparing the DNA for electrophoresis
A dye is added to the sample of DNA prior to electrophoresis to increase the viscosity of the sample which will prevent it from floating out of the wells and so that the migration of the sample through the gel can be seen.
A DNA marker (also known as a size standard or a DNA ladder) is loaded into the first well of the gel. The fragments in the marker are of a known length so can be used to help approximate the size of the fragments in the samples.
The prepared DNA samples are then pipetted into the remaining wells of the gel.
When this is done the lid is placed on the electrophoresis tank making sure that the orientation of the gel and positive and negative electrodes is correct (we want the DNA to migrate across the gel to the positive end).
Separating the fragments
The electrical current is then turned on so that the negatively charged DNA moves through the gel towards the positive side of the gel.
Shorter lengths of DNA move faster than longer lengths so move further in the time the current is run.
The distance the DNA has migrated in the gel can be judged visually by monitoring the migration of the loading buffer dye.
The electrical current is left on long enough to ensure that the DNA fragments move far enough across the gel to separate them, but not so long that they run off the end of the gel.
Illustration of DNA electrophoresis equipment used to separate DNA fragments by size. A gel sits within a tank of buffer. The DNA samples are placed in wells at one end of the gel and an electrical current passed across the gel. The negatively-charged DNA moves towards the postive electrode. Image credit: Genome Research Limited
tank.
Which of these does mRNA do in eukaryotic cells but not prokaryotic cells?
A. duplicate itself
B. cross a membrane
C. coil into a compact crystal form
D. break off some of its phosphates to release energy
Answers
In the case of prokaryotic cells, the mRNA does not need to cross a nuclear membrane. So the correct option is B.
What is prokaryotic mRNA?The kind of mRNA produced by transcription in prokaryotes is known as prokaryotic mRNA. In most cases, RNA polymerase is in charge of turning genes into mRNA molecules. Prokaryotic mRNA's primary characteristic is polycistronic, however.
As a result, a single mRNA molecule comprises a number of structural genes that are members of a certain operon. As a result, many locations for the start and termination of polypeptides exist inside the same mRNA molecule. This explains how several kinds of proteins may be made by a single bacterial mRNA molecule.
Prokaryotes also usually combine transcription and translation. While a result, bacterial mRNA translation begins as the DNA template is now being transcribed. Therefore, post-transcriptional changes to bacterial mRNA molecules are quite limited. They frequently undergo rapid ribonuclease degradation, shortening bacterial mRNA's half-life.
Therefore the correct option is B.
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What is population ecology?
I
Answers
Answer:
poplation is a group of individuals that are of the same species
Explanation:
Answer:
A group of individuals that. belong in the same species and live in the same area
What an enzyme?
I'll give brainliest
Answers
Answer:
Enzymes are proteins that act as biological catalysts. Catalysts accelerate chemical reactions. The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products.
Explanation:
Hope this helps
Answer:
what that guy said, brainliest please
explain how plants are involved in the carbon cycle
Answers
Compare and contrast a Keystone Species with a Keystone Predator
NEED ANSWER ASAP
Answers
A keystone species is one that has a disproportionate impact on its ecosystem when compared to its abundance. A foundation species is usually a primary producer that dominates an ecosystem in abundance and influence.
which would be the complementary strand of dna that forms on this template dna fragment during replication?
Answers
The complementary strand of DNA that forms on this template DNA fragment during replication is 3'--CCAAAGAAGTTCTCT--5'
DNA replication is the organic manner of manufacturing two identical replicas of DNA from one authentic DNA molecule. DNA replication takes place in all dwelling organisms acting as the maximum important element for organic inheritance.
DNA replication is the technique by means which a double-stranded DNA molecule is copied to supply equal DNA molecules. Replication is a crucial system because, each time a mobile divides, the two new daughter cells ought to include equal genetic data, or DNA, as the figure mobile.
DNA replication happens inside the nucleus in eukaryotic cells and in the nucleoid vicinity of prokaryotic cells. Eukaryotic cells are cells that have a nucleus and membrane sure organelles, along with plant cells and animal cells. Eukaryotic cells incorporate their DNA inside the nucleus, and as a result, this is in which DNA replication takes place.
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Disclaimer:- your question is incomplete, please see below for the complete question.
Show the complementary strand of DNA that forms on this template DNA fragment during replication.
5'--GGTTTCTTCAAGAGA--3'
What part of the brain acts as a relay station by which our senses (except for smell) must go through before reaching the neocortex
Answers
The thalamus is the part of the brain that acts as a relay station by which our senses (except for smell) must go through before reaching the neocortex. It is a small structure located just above the brainstem that receives and integrates sensory information from various parts of the body, such as vision, hearing, touch, and taste.
Here is a more detailed explanation:
Senses are constantly bombarded by an enormous amount of information that must be processed and integrated in order to produce a coherent perception of the world around us. This information is first detected by specialized cells in the sensory organs, such as the eyes, ears, skin, and tongue. From there, it is transmitted along sensory pathways to the thalamus, which acts as a relay station that filters and prioritizes the signals before sending them on to the neocortex.
The neocortex is the outermost layer of the brain and is responsible for higher cognitive functions such as perception, consciousness, thought, and language. However, it is not directly connected to the sensory organs and must rely on the thalamus to receive sensory input. This allows the thalamus to modulate and regulate the flow of sensory information to the neocortex, depending on the needs and demands of the organism at any given moment.
In addition to its role as a relay station, the thalamus also plays an important role in sensory processing and perception. It contains specialized nuclei that are dedicated to processing specific types of sensory information, such as the lateral geniculate nucleus for vision and the medial geniculate nucleus for hearing. These nuclei receive input from the sensory organs and then project their output to specific regions of the neocortex that are responsible for processing that type of information.
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Graded potentials: Group of answer choices include receptor potentials and postsynaptic potentials. are conducted decrementally. include depolarizing and hyperpolarizing potentials can be summed are described by all of these.
Answers
Graded potentials are electrical signals that are generated by changes in the membrane potential of a neuron, muscle cell, or other excitable cell. These potentials are conducted decrementally.
Here, correct option is B.
These can be either depolarizing or hyperpolarizing, depending on the type of cell and the stimulus that causes the change in membrane potential. Graded potentials are further described by their ability to be summed, meaning that multiple graded potentials can be combined to produce a single, larger response.
Receptor potentials and postsynaptic potentials are two kinds of graded potentials that are important for signaling within the nervous system. Receptor potentials are electrical signals generated in sensory neurons when they are stimulated by external stimuli.
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The molecule that enhances the ability of testosterone to promote spermatogenesis is inhibin.a. Trueb. False
Answers
The statement "The molecule that enhances the ability of testosterone to promote spermatogenesis is inhibin" is false because FSH promotes spermatogenesis.
The hormones of the male reproductive system work together to maintain appropriate levels of testosterone and sperm through a negative feedback loop. The anterior pituitary gland's gonadotropic cells produce and emit FSH, a hormone that promotes spermatogenesis. Inhibin It can only be produced by the testis, mostly by the Sertoli cells in the prepubertal testis, however, it's unclear where production takes place in the adult testis.
Utilizing a negative feedback system, inhibitin B regulates FSH secretion. When testosterone levels increase in males, the anterior pituitary and hypothalamus release the hormone inhibin, which prevents the release of GnRH, FSH, and LH. This results in a negative feedback mechanism. When the sperm count is high, the hormone inhibin, which is produced by the Sertoli cells, is released into the bloodstream.
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Which of the following could be illustrated by the bird eating the white moth?
a. reproduction
b. differentiation
C. competition
D. selection
Answers
Answer:
D
Explanation:
Because selection is a process in which environmental influences determine which type of
organism thrive better than other, regarded as a
factor of evolution.
The bird eating the white moth is the illustrated as the process of selection and the process of reproduction also takes place. Thus, option D is correct.
What is reproduction?
Reproduction has been defined as the process carried out by the living organisms and during the process of reproduction the living organisms produces their own young ones and feed them. Reproduction has been the supreme quality of the living things.The process of the reproduction in which two parents are involved has been said to be sexual mode of the reproduction and the process of reproduction in which only single parent has been involved in the known as asexual mode of the reproduction.
There are two types of the reproduction and these are the sexual and asexual reproduction. The process of the reproduction in which two parents are involved has been said to be sexual mode of the reproduction and the process of reproduction in which only single parent has been involved in the known as asexual mode of the reproduction. Reproduction has been the supreme quality of the living things.The example of the asexual reproduction are budding, fragmentation, spore formation, and binary fission.
Therefore, The bird eating the white moth is the illustrated as the process of selection and the process of reproduction also takes place. Thus, option D is correct.
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Impressions of tropical swamp plants were observed on rocks in polar regions. The impressions were dark black imprints, which means the fossils are examples of __. The fossils tell us that polar regions __.
blank 1
carbonization
mineralization
trace fossils
blank 2
had tropical plants that could grow in ice
might have had a different climate in the past
will have abundance of vegetation
Answers
Answer:
Impressions of tropical swamp plants were observed on rocks in polar regions. The impressions were dark black imprints, which means the fossils are examples of carbonization, mineralization, and trace fossils.
Explanation:
The fossils tell us that polar regions had tropical plants that could grow in ice,
might have had a different climate in the past, and will have abundance of vegetation.
Brainliest + 100 points if it is correct:
A political consequence describes any change, good or bad, in the way people or businesses are governed. Sometimes laws that protect the environment can make less land available for other uses. What political consequence could occur to a community that has less land for businesses?
a: The health of the growing community improves over time without new businesses.
b: New companies are prevented from building and current companies cannot expand.
c: More people will move to the community for career opportunities.
d: The lives of humans are protected, and businesses are saved in the community.
Answers
Answer: B makes the most sense
Explanation: b
I need a organism but I forgot if its a animal or plants so can someone help me bc I need to write its name, where it lives and what it's eats and what eats it. when get it Can do the rest
Answers
Answer:
Let's say... a bird. Some birds nest in brush or the lower parts of trees. Others prefer treetops. Some like the shady deep forest and others prefer a single tree or bush in a forest clearing. Many birds like the edge of a windbreak or wooded area, next to an open area. Some eat seeds, berries, fruit, insects, other birds, eggs, small mammals, fish, buds, larvae, aquatic invertebrates, acorns and other nuts, aquatic vegetation, grain, dead animals, garbage, and much more. Birds are attacked and eaten by other birds, including falcons, owls and eagles. Different kinds of serpents and other reptiles kill adult and baby birds alike. Four-legged predators such as bobcats and weasels are bird-eaters
Explanation:
yes, i was confused and suck at explaining stuff so... I get a cookie and hug >:D
The Cordon is the trunk of the grape plant
True
False
Answers
Answer:
The Cordon is the arms of the plant
Explanation:
Hope this helped Please mark brainylest.
What harm can steve do by acting in a role he isn't trained for
Answers
Steve can cause a lot of harm to himself, his team and the organisation he is working for by acting in a role he is not trained for. If Steve is not trained for the role he is acting in, he is likely to make mistakes that can have long-term consequences.
For example, if Steve is not trained to handle financial transactions, he could make mistakes in the accounting books which could lead to losses for the organisation. Furthermore, if Steve is not trained to handle difficult customers, he may not be able to resolve customer issues effectively and efficiently, leading to customer dissatisfaction and a loss of business.
Finally, if Steve is not trained to manage a team, he may not be able to manage the team effectively and could result in a lack of productivity and morale. In short, acting in a role Steve is not trained for can cause a lot of damage.
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When working out the energy in food, the equation is:
Energy of food=mass of water x temperature change of water x 4.2
why do you multiply by 4.2?
Answers
Answer: The specific heat capacity of water is 4.2 J/g C°
Explanation: The equation you provided is actually for calculating the amount of heat transferred to or from water when its temperature changes. This equation is commonly known as the specific heat capacity equation and can be expressed as follows:
Q = mcΔT
Where Q is the amount of heat transferred, m is the mass of the substance (in this case, water), c is the specific heat capacity of the substance (which is 4.2 J/g°C for water), and ΔT is the change in temperature of the substance.
To calculate the energy content of food, a different equation is used, which is known as the calorimetry equation. This equation can be expressed as follows:
Energy content of food = heat gained by water / mass of food
In this equation, the heat gained by water is the amount of heat transferred to the water when the food is burned in a calorimeter, and the mass of the food is the mass of the food sample that was burned. The energy content of the food is typically expressed in units of joules or calories.
carbohydrate loading: group of answer choices eating carbohydrate-laden foods the day before an endurance event tapering in the intensity of workouts with a corresponding increase in the percentage of carbohydrate intake minimal exercise and a high-carbohydrate diet the first 3 days, followed by heavy exercise and a low-carbohydrate diet right before competition does not increase glycogen stores to any significant degree
Answers
By increasing the amount of fuel stored in your muscles, or carbohydrate-loading diet, you can increase your athletic performance during endurance events.
When you consume a high-carbohydrate "training diet" and reduce your activity level in the days leading up to an event, this is known as carbohydrate loading.
Purpose
Carbohydrates are the essential fuel for all physical exertion. The majority of recreational activities require your body to draw on its stored energy.
However, your body need more energy to continue when you participate in lengthy, demanding sports activity. The goal of carbohydrate loading is to increase your athletic performance by providing you with the energy you need to finish an endurance exercise with less exhaustion.
If you're an endurance athlete, such as a marathon runner, swimmer, cyclist, or all three, training for a competition that will last 90 minutes or longer, carbohydrate loading may be especially helpful. generally among other athletes
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A 0.25 m2 quadrat was placed in a 50 m2 field. 22 daisy plants were counted under the quadrat. What is the estimated number of daisies in the field?
Answers
If we assume that the distribution of daisy plants in the field is uniform, we can use the following formula to estimate the total number of daisies in the field:
Total number of daisies in the field =
(Number of daisies in the quadrat / Area of the quadrat) x Area of the field
Plugging in the given values, we get:
Total number of daisies in the field = (22 / 0.25) x 50
Total number of daisies in the field = 8.8 x 50
Total number of daisies in the field = 440
Therefore, the estimated number of daisies in the field is 440.
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If an organism required stable water temperatures and extreme pressure in order to survive, what zones would it most likely be found in, and why? Epipelagic and Abyssopelagic zones, because they are deeper than 1,000 meters and have consistent temperatures near freezing Epipelagic and Bathypelagic zones, because they are shallower than 1,000 meters and have consistent warm temperatures Abyssopelagic and Bathypelagic zones, because they are deeper than 1,000 meters and have stable temperatures near freezing Mesopelagic and Bathypelagic zones, because they are shallower than 1,000 meters and have consistent warm temperatures
Answers
Answer:
Abyssopelagic and Bathypelagic zones, because they are deeper than 1,000 meters and have stable temperatures near freezing.
Hope this helps :) !!!
Answer: Abyssopelagic and Bathypelagic zones, because they are deeper than 1,000 meters and have stable temperatures near freezing
Explanation: Took the exam.
dsdna vs ssdna complementary strand
this strand is dsdna
ATTCCGATAA
what is the ssdna complementary strand? (can there be an ssdna
complementary strand?)
Answers
The ssDNA complementary strand to the given dsDNA sequence "ATTCCGATAA" would be "TAACGCTTTT".
DNA stands for deoxyribonucleic acid and is a double-stranded, helical polymer that carries genetic information in nearly all living organisms. It serves as the blueprint for the synthesis of RNA (ribonucleic acid) and proteins, which are essential for life processes such as replication, transcription, and translation.
The dsDNA strand given is ATTCCGATAA. To obtain the ssDNA complementary strand, you must first understand the base-pairing rules. Adenine (A) only pairs with thymine (T), while cytosine (C) only pairs with guanine (G). You may utilize the complementary base-pairing rule to discover the ssDNA complementary strand.
So, the complementary strand for ssDNA is feasible, and the complementary strand for dsDNA is TAAGGCTATT.
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What type of macromolecule contains phosphorus as part of a phosphate group?.
Answers
Answer:
Nucleic acids and the lipids.
Explanation:
hope it helps
which organ of the female reproductive system produces milk?
A. mammary gland
B. breasts
C. ovary
D. uterus
Answers
What do you notice about the path oxygen
molecules take inside the Metabolism Simulation of
a healthy body? Describe in detail.
Answers
Answer: something that i notice about the path oxygen is that anytime i eat something oxegen comes in and then after that the remaining oxegen comes out and then the lefover oxegen stay inside the respiratory system
Explanation:
The path oxygen takes inside the metabolism simulation is ; Diffusion
When we breathe in air the oxygen molecules contained in the air we breathe in move inside into our capillaries and from the capillaries into the body cells of an individual through a specific pathway known as diffusion.
As the oxygen moves into the the body cells from the capillaries the carbon dioxide ( by product ) contained in the body cells moves into the capillaries and is expelled out through the lungs.
Hence we can conclude that the path oxygen takes inside the metabolism simulation is diffusion.
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During ___________, the cell grows, makes a DNA copy, and prepares to split into two cells
Answers
Answer:
Interphase
Explanation:
8
What is TRUE about DNA?
A.
It consists of three strands that form a triple helix shape.
B.
C.
D.
It is only found in saliva, blood, sweat, and hair.
It is not able to be replicated in any way.
It is found in every cell in the human body.
Answers
It is found in every cell in the human body.
what are the steps taken by nature to change a mountain into soil? (weathering and erosion)
Answers
Answer:
It keeps going over and over again
Explanation:
The weathering and erosion process keeps going over and over again. Weathering comes first and then erosion, depending on the seasons the methods of weathering change and same goes for erosion
A red flower and a flower with red and white spots are crossed. What is the percentage of them having an all red flower
Answers
Answer:
75%
Explanation:
Since the red seems to be to dominant trait, and the white recessive, I would assume that 75% would be the answer due to using a punnet square.
Discuss the general causes of chromosomal diseases.
Answers
Answer:
Chromosome abnormalities often happen due to one or more of these: Errors during dividing of sex cells (meiosis) Errors during dividing of other cells (mitosis) Exposure to substances that cause birth defects (teratogens)
Answer:
A chromosome abnormality, chromosomal anomaly, chromosomal aberration, chromosomal mutation, or chromosomal disorder, is a missing, extra, or irregular portion of chromosomal DNA. These can occur in the form of numerical abnormalities, where there is an atypical number of chromosomes, or as structural abnormalities, where one or more individual chromosomes are altered.
Explanation:
How does food storage and digestion take place in an amoeba?
Answers
Food storage and digestion take place in an amoeba occur through food vacuoles.
Amoeba is a monocellular organism that shows holozoic nutrition. It absorbs nutrients and food from the surroundings by contracting the vacuole. It has pseudopodia a drizzle-like structure that moves food into the vacuole. Inside this vacuole, there are lysosomes that contain the hydrolytic enzymes. These enzymes perform the breakdown of food particles. The digested food is then directly absorbed through the cytoplasm. This is circulated to organelles and stored for energy. After assimilation, the undigested food and waste are excreted out by fusing of food vacuole with the cell membrane.
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Answer:
Explanation:Amoebas are single-celled organisms that belong to group protozoa.Food storage and digestion occur through process called phagocytosis. Due the presence of flexible membrane,they can change their shape,viz essential for their feeding mechanism.
Psuedopods are temporary projections of its cell membrane which is extended when it encounters a food particle. These pseudopods surround the food particle forming a small cavity called food vacoule.
Once the food particle is enclosed within the food vacuole, the membrane of the vacuole fuses and forms a (digestive vacuole)phagosome which contains the food particle and digestive enzymes. The digestive enzymes in phagosome breakdown the food particle into smaller molecules. The enzymes include proteases for protein digestion, carbohydrases for carbohydrate digestion, and lipases for lipid digestion.
Smaller molecules are gradually absorbed into the cytoplasm of the amoeba, where they can be utilized for various metabolic processes. The digestion products are transported across the membrane of the digestive vacuole into the cytoplasm through diffusion.
Any undigested or indigestible material is eventually expelled from the amoeba's body by process of exocytosis. During exocytosis, the residual waste material is packaged into a vesicle and then released outside the cell.
Food storage and digestion in amoebas involve
1: the engulfment of food particles through phagocytosis,
2: the formation of digestive vacuoles,
3: enzymatic breakdown of the food,
4:absorption of nutrients into the cytoplasm,
5: and elimination of waste materials through exocytosis.