Who was the first to identify DNA and what was the name given to it by him Class 12?
Answers
Answer:
The molecule now known as DNA was first identified in the 1860s by a Swiss chemist called Johann Friedrich Miescher. Johann set out to research the key components of white blood cells. part of our body's immune system. The main source of these cells was pus-coated bandages collected from a nearby medical clinic.
Explanation:
Related Questions
which of the following was not one of darwin's observations?group of answer choicessome characteristics afford their possessor a better chance of survivalchanges in organisms were gradual and took place over long periods of timesome characteristics are heritable and passed on to offspringmembers of the same species may exhibit considerable variationmost individuals have an equal chance to survive and reproduce
Answers
The correct answer is: 1. Most individuals have an equal chance to survive and reproduce. This statement was not one of Darwin's observations.
The statement - Most individuals have an equal chance to survive and reproduce was not one of Darwin's observations.
Darwin observed that individuals within a population vary in their traits and that some traits can provide advantages for survival and reproduction.
This leads to differential survival and reproduction, with individuals possessing advantageous traits being more likely to pass them on to the next generation.
Darwin's observation was that individuals with certain advantageous traits have a better chance of survival and reproduction compared to others, which leads to the accumulation of favorable traits in a population over time. This concept is known as natural selection.
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The correct question is:
Which of the following was not one of darwin's observations?
1. some characteristics afford their possessor a better chance of survival
2. changes in organisms were gradual and took place over long periods of time
3. some characteristics are heritable and passed on to offspring
4. members of the same species may exhibit considerable variation
5. most individuals have an equal chance to survive and reproduce
What happens to nature when forest animals aren't present? Explain.
Answers
When forest animals aren't present, they often are hiding from you or some type of machine. When they're present, they can be just as aggressive as if you were being chased by a bear.
Answer:
Explanation:
This is what I found.
If there are no animals in forests, then there will be a lack of Carbon Dioxide which is required by Plants for Photosynthesis. If plants wont be able to do photosynthesis to get food,then they will die, resulting in lack of oxygen in that place, and slowly the Humans and Animals would finish due to the lack of oxygen.
Hope this helps you
Why can't we measure genetic variation in a population using only phenotypes? select all that apply.
Answers
The correct options about why we can't measure genetic variation in a population using only phenotype are:
C) The environment can also affect the phenotype.
D) Many traits are encoded by multiple genes.
E) A single genotype can produce multiple phenotypes.
How to measure Genetic Variation?Let us look at each of the given options:
A) Phenotypes are not influenced by genes:
This statement is wrong because a phenotype is an observable physical or biochemical trait of an individual that is determined by the interaction between an organism's genotype (genetic makeup) and the environment, and is therefore influenced by genes.
B) Each trait is encoded by a single gene.
This statement is wrong. Many traits are controlled by multiple genes rather than by a single gene, a phenomenon known as polygenic inheritance. Multiple genes may contribute to the expression of a single phenotype.
C) The environment can also affect the phenotype:
This statement is correct because an individual's phenotype can be influenced by environmental factors such as diet, temperature, exposure to toxins, and other external influences. Environmental factors can alter or interact with genetic instructions, leading to variations in phenotypic expression.
D) Many traits are encoded by multiple genes.
This statement is correct. As mentioned earlier, polygenic inheritance is a general phenomenon in which multiple genes contribute to the expression of a particular trait. These genes interact and interact with environmental factors to shape the phenotype.
E) A single genotype can produce multiple phenotypes.
This statement is correct. Phenotypic variation can result from differential interactions between an organism's genotype and environment. Even individuals with the same genotype can exhibit different phenotypes during development due to variations in gene expression, epigenetic changes, or environmental influences.
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Complete question is:
Why can't we measure genetic variation in a population using ONLY phenotypes? Select all that apply.
A) Phenotypes are not influenced by genes.
B) Each trait is encoded by a single gene.
C) The environment can also affect the phenotype.
D) Many traits are encoded by multiple genes.
E) A single genotype can produce multiple phenotypes.
the way that genetic information is coded in DNA is-
Answers
Answer:
with bases
Explanation:
Genetic information is coded in DNA by means of four bases: two purines (adenine and guanine) and two pyrimidines (thymine and cystosine). Each adjacent sequence of three bases (a codon) determines the insertion of a specific amino acid. In RNA, uracil replaces thymine.
hope this helps, pls mark brainliest :D
Will give Brainiest.
100pts.
Please label this.
Answers
Answer:
Explanation:
11= vena cava
12= right atrium
13= the red one that i can't see lol
14= right ventricle
15= pulmonary artery
16= pulmonary veins
17= left atrium
18= left ventricle
19=aorta
Answer:
11. Right pulmonary artery
12. Right atrium
13. Pulmonary valve
14. Right ventricle
15. Left pulmonary artery
16. Pulmonary vein
17. Left atrium
18. Left ventricle
19. Aorta
Explanation: The picture was a little blurry but I hope this helps!
Within a(n) ____________ of fish that inhabits a yellow coral reef, some fish are orange and some fish are yellow as a result of a ____________ for body color.
Answers
Within a population of fish that inhabits a yellow coral reef, some fish are orange and some fish are yellow as a result of a selective pressure for body color.
Selective pressure refers to an environmental or ecological factor that affects the reproductive success of an organism and hence indirectly affects the evolution of the population. In this case, the selective pressure is for body color and is determined by the environment of the fish - the yellow coral reef - which makes the orange and yellow fish differentially suited for survival and reproduction.
Over time, the selective pressure can lead to changes in the frequency of the traits in the population, as the organisms with the most favorable traits are more likely to survive and reproduce than those without them.
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2. Which of the following autotrophs is also a producer?
(a) a maple tree
(b) the blue-green bacteria known as cyanobacteria
(c) Laurencia, a marine genus of Red Algae from Hawaii.
(d) All of the above are producers.
Answers
a bacterial pathogen has breached the skin barrier of a human. this is the first time this human host has been exposed to this particular pathogen. which statement is not true regarding this situation?
Answers
A bacterial pathogen has breached the skin barrier of a human. this is the first time this human host has been exposed to this particular pathogen. The statement is not true regarding this situation is the pathogen will be killed by the immune system.
When a bacterial pathogen breaches the skin barrier of a human for the first time, there are a few things that happen. First, the host's immune system is triggered and recognizes the foreign bacteria. The immune system will then attempt to fight off the pathogen through the production of antibodies and other cellular responses.
However, the pathogen is able to survive and reproduce, which can lead to an infection. This is because the immune system against the new pathogen has not yet fully developed. So the answer is not true regarding situation is the pathogen will be killed by the immune system.
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In a food chain the flow of energy is Always___.
one-way
reversible
two-way or
uncontrolled
Answers
How does the body dispose of carbon dioxide?
metabolizes it through oxidation
returns it to the capillaries
stores it for later use
releases it through the lungs
Answers
\(▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪\)
The body disposes carbon dioxide while exhalation, through the lungs ~
Can someone help me with this?
Click on the image to see the question and answers
Answers
The Columbian Exchange is an important part of the history of artificial selection and selective breeding because D. It was the first transfer of products between the Old World and the Americas; apples are an example of fruit involved.
How did the Columbian Exchange show selective breeding ?The Columbian Exchange was an important factor in the development of modern agriculture and the selective breeding of plants and animals, which has led to the wide variety of food and agricultural products available today.
For example, the Columbian Exchange brought horses, cattle, and pigs to the Americas, which had not previously been present in the region. These animals were then selectively bred and adapted to the new environment, resulting in the development of new breeds and varieties.
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Imagine an invertebrate that lives in an estuary where salinity varies cyclically with the tides. If this individual is able to adjust the salt concentration of its body fluids, its salt concentration will have:____.
Answers
If the invertebrate living in an estuary can adjust the salt concentration of its body fluids, its salt concentration will have relatively constant despite the cyclic changes in salinity caused by the tides.
This ability to regulate salt concentration, known as osmoregulation, is essential for organisms living in environments with fluctuating salinity levels. Depending on the invertebrate species and its physiological adaptations, it may be able to maintain a constant internal salt concentration by actively transporting salts in and out of its body or by excreting excess salts through specialized structures. The ability to osmoregulation is critical for the survival and functioning of many aquatic organisms, including those living in estuaries.
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The following are sources of Earth's internal heat energy EXCEPT
a. Decay of radioactive isotopes
b. Primordial heat
c. pressure from overlying layers
d. Sun’s energy
Answers
The sun's energy is not a source of Earth's internal heat. So the correct option is D.
What is the earth's internal heat?
Nobody has even gotten close to directly examining the interior of the Earth. So there is disagreement among geophysicists as to how heated the Earth's core is. However, the speed at which earthquake waves, sometimes known as "seismic waves," move may reveal a lot to scientists about the composition of the Earth.
The solidity, liquidity, or partial solidity of these materials can also be determined using seismic data. Laboratory results, meanwhile, show what pressures and temperatures the materials inside the Earth should melt at.
The temperature of the Earth's core is thought to be between 5,000 and 7,000 degrees Celsius based on this information. That is far colder than the sun's inside, yet roughly as heated as the sun's surface.
Although the amount of heat created inside the Earth is immense, the amount of heat energy received from the sun is around 5,000 times stronger. The weather is influenced by the sun's heat, which ultimately leads to erosion. It is so paradoxical that although the heat of the Earth creates mountains, the energy of the sun gradually breaks them down again.
Therefore the correct option is D.
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When formulating a new recipe, food scientists take detailed notes of their procedures and record carefully measured amounts of the ingredients. Different scientists will then follow the steps in the recipe and compare the final products. Why is it important for other food scientists to review new recipes before they are sold to the public?
Answers
Possible answers:
To ensure that the results can be duplicatedTo inspect the final product(s) for anything harmful or unexpected outcomes(such as causing the wrong kind of chemical reaction during the cooking process)To test the best way to cook or heat up the product is(microwave, oven, ect.)To ensure that the serving size is not too large or too small for the target consumer(child-size vs adult-size servings)Imagine a cell had a version of helicase that was permanently stuck at the origin of replication. Would this be considered a dominant negative mutant and why? Only one of the explanations below is correct (among the last 4 answer choices)
a yes...since it will prevent normal helicases from functioning.
b no...because it is an inactive protein.
c only if it was the only version of helicase in the cell.
d Yes...because there would be excess DNA replication.
Answers
Answer: A. yes...since it will prevent normal helicases from functioning.
Explanation: Imagine a cell had a version of helicase that was permanently stuck at the origin of replication. It would be considered a dominant negative mutant since it will prevent normal helicases from functioning.
An object with a mass of 20 kg and potential energy of 584 J is what distance above the ground
Answers
Answer:
29.2 m
Explanation:
P=mh. Plug in the values.
584 J = 20 kg x h
h = 29.2 m
If it's gravitational potential energy multiply is by gravity which I think is 10 m/s.
Which describes a feature of the physical properties of all substances?
can dissolve in water
can conduct heat and electricity
rearranges atoms to form new substances
does not change the identity of a substance
Answers
Answer:
D
Explanation:
D
Answer:answer is d
Explanation:took the test
What are created during the process of translation?
Answers
Answer:
a gene expression
Explanation:
and
which findings indicate that bart is already experiencing some complication of high glucose levels? (select all that apply. one, some, or all options may be correct.)
Answers
Diabetes, a condition that can lead to serious, long-term health issues, can be indicated by high blood sugar levels (hyperglycemia). In addition to these diseases, such as issues with your pancreas or adrenal glands, high blood sugar can also be brought on by other illnesses that influence insulin or glucose levels in your blood.
Extremely high blood sugar levels can result in potentially fatal consequences, such as diabetic ketoacidosis (DKA), a condition that occurs when the body breaks down fat for energy and can put a person into a diabetic coma. Type 1 diabetics are more likely to have DKA. An individual could feel short of breath if this happens. a flavor or odor of fruit on the breath.
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The complete question is:
What findings indicate that bart is already experiencing some complication of high glucose levels?
Which of the following is a sign that a physical reaction has occurred?
Eruption or formation of bubbles
change in chemical formula
expanding to occupy a larger, bigger volume
change in temperature
Answers
Answer: Change in temperature
Answer: Change in temperature
Explanation:
The temperature change is not actually changing anything chemically, only physically!
What is the major limiting factor to the numbers of producers at great depths in the ocean?
A. Type of seafloor
B. Amount of sunlight
C. Variety of consumers
D. Availability of minerals
Answers
Answer:
B. Amount of sunlight
Explanation:
The producers in the ocean are dependent on the amount of sunlight because that is one of the major things they need to get their food.
I hope this helps~
What is a stinging cell that is a distinguishing feature of all cnidarians
Answers
Corals, sea anemones, jellyfish, and their cousins make up this phylum. Cnidocytes, specialized stinging cells that line the tentacles of Cnidaria, are used to capture prey.
What cnidarians having characteristics of stinging cell?Cnidarians have specialized cells called cnidocytes, sometimes known as “stinging cells,” which contain nematocysts.
These cells, which are concentrated on the animal's mouth and tentacles, have the ability to use toxins to paralyze prey. The coiled threads in nematocysts may be studded with barbs.
Nematocysts are unique cellular weapons employed for both predation and defense found in jellyfish, sea anemones, and other cnidarians.
Therefore, Nematocysts are made up of a pressurized capsule with a coiling thread like a harpoon inside.
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Which of these statements would be MOST important to include in an objective summary of the article?
A. The health triangle is a helpful tool for visualizing your total well-being.
B. Physical health represents your biological welfare and how to protect your body from illness or injury.
C. Consuming a well-balanced diet is one of the best ways to fuel your physical health.
D. You don't have to compete in Ultra-Marathons in order to reap the physical benefits of exercise.
Answers
Answer:
A
Explanation:
Can rocks melt from heat?
A. Yes
B. No
Answers
Answer:
A
Explanation:
They become magma
The _________ has the most vigorous circulation because it is
caused by more intense heating from the sun.
A/. Ferrell cell
B/. subtropical jet stream
C/. polar jet stream
D/. westerlies
E/. Hadley cell
Answers
The Hadley cell has the most vigorous circulation because it is caused by more intense heating from the sun, option E is correct.
The Hadley cell is a tropical atmospheric circulation pattern that is responsible for the most vigorous circulation on Earth. It is caused by intense heating from the sun near the equator, which creates a region of low pressure. As the air rises near the equator, it moves poleward at high altitudes and then descends into the subtropics, creating a belt of high pressure.
The intense heating near the equator drives the Hadley cell and contributes to its vigorous circulation. This circulation pattern influences weather and climate in the tropics and beyond and plays a crucial role in the formation of tropical rainforests, deserts, and the trade winds, option E is correct.
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which of the following is a function of the nucleus.
stores sugar
packages proteins
stores dna
builds proteins.
Answers
Answer:
Stores DNA.
Explanation:
The nucleus is the control center of the cell.
If 20% of a population is eaten each generation how long will it take for them to go extinct?'
Answers
Answer:
Wild mammals have declined by 85% since the rise of humans. A diverse range of mammals once roamed the planet. This changed quickly and dramatically with the rising number of humans over the course of the last 100,000 years. Over this period, wild terrestrial mammal biomass has declined by an estimated 85%.
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Explanation:
In the nucleus, _______ tell cells what to do and how to change.
Answers
Answer: genetic material or DNA
Explanation
The genetic material of the nucleus is like a set of instructions.These instructions tell the cell how to build molecules needed for the cell to function properly. That is, the DNA tells the cell how to build molecules needed for life.Provide one biotic factor that could increase the deer population's carrying capacity. Explain why this biotic factor would increase the carrying capacity.
Answers
HELP THIS IS DUE TODAY!!!!!
Answers
Answer:
Hey ! I think I can help with this....
a.) Marine life adds carbon dioxide to ocean water during respiration.------Hydrosphere.
b.)Plants on land release oxygen during photosynthesis.----Atmosphere.
c.Bacteria living underground convert ammonia to nitrates.---- Geosphere.
d.)The waste from livestock adds nitrogen to the soil.----Geosphere.
Explanation:
I think geosphere has to do with things concerned with land and atmosphere is concerned with air and hydrosphere is concerned with water.. Thank you for the questions.