Answers
Answer:
A helium atom has a heavier nucleus and two electrons, A lithium atom has a still heavier nucleus and three electrons.
Explanation:
Related Questions
How are genes expressed? A. by recombining DNA B. by producing proteins C. by producing plasmids D. Through repressor proteins
Answers
Answer:
Its actually B) By producing Proteins
Explanation:
science
Answer:
B. by producing proteins
Explanation:
Genes are expressed by producing proteins. So, option (B) is correct answer.
What is the first branch of the evolutionary tree
Answers
The first branch of the evolutionary tree is believed to be the separation between prokaryotes (organisms lacking a cell nucleus) and eukaryotes (organisms with a cell nucleus).
The evolutionary tree, also known as the tree of life or phylogenetic tree, represents the evolutionary relationships between all living organisms on Earth. It illustrates the diversification of life over time, showing how different species are related to one another through common ancestors.
1. The first step in understanding the first branch of the evolutionary tree is to recognize that all life on Earth can be classified into three main domains: Bacteria, Archaea, and Eukarya.
2. Among these domains, Bacteria and Archaea are considered prokaryotes, which are single-celled organisms lacking a membrane-bound nucleus. They are believed to have diverged from a common ancestor.
3. Eukarya, on the other hand, comprises organisms with eukaryotic cells, which possess a nucleus surrounded by a membrane. This domain includes all complex organisms such as plants, animals, fungi, and protists.
4. The separation between prokaryotes and eukaryotes is considered the first major branch in the evolutionary tree. It represents a fundamental divergence in cellular structure and complexity.
5. While the exact details and timing of this divergence are still the subject of scientific investigation, it is generally believed to have occurred billions of years ago, early in the history of life on Earth.
6. This initial split paved the way for the subsequent diversification of life, leading to the vast array of species and ecosystems we observe today.
7. It is important to note that the evolutionary tree is a constantly evolving representation of our understanding of the relationships between organisms. New discoveries and advances in scientific knowledge may lead to revisions and refinements of the tree over time.
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Either true (t) or false (f)
A) ___ The initial portions of both aerobic and anaerobic respiration involve the direct utilization of oxygen molecules during this glycolytic sequence
B) ___ The movement of protons from the matrix through the electron transport chain to the intermembrane space would be an example of facilitated diffusion.
C) ___ The proton pumps of the inner membrane of the mitochondrion are examples of integral transmembrane, active-transport carrier proteins.
D.___ During the series of reactions called Glycolysis there is a net production of 6 ATPs and 2 of these ATPs are produced (phosphorylated) during the initiation (first ½) of this process.
E.___ Ribozymes are catalytic molecules in cells that function like enzymes but are composed of nucleic acid (RNA).
F.___ The pigment molecules, that make up a component of the chloroplasts of a plant, absorb light best in the green wavelengths and that is why the plants appear so green.
G.___ Bacterial rhodopsin pigment has the ability to absorb light energy, to generate of a proton gradient, and this potential energy can be used for the production of ATPs.
H.___ Chemiosmosis and the Citric Acid Cycle take place within the cytoplasm of the cell.
I.___ During both photosynthesis and anaerobic respiration the event of chemiosmosis occurs and produces ATPs as a result of a proton motive force.
J.___ The final electron acceptor, for the electron transport chain, in anaerobic respiration is almost exclusively an organic molecule and usually NAD+.
K.___ The initial "reason" for one of your muscle cells to switch to fermentation is a lack of adequate final electron acceptor levels which then leads to a shortage of NAD+.
L.___ The final electron acceptor, that receives electrons from the molecules embedded in the chloroplast membrane (site of photophosphorylation), is a molecule of NADP+.
Answers
A. false
cellular respiration occurs both aerobically(using oxygen) and anaerobically(without oxygen).
glycolysis is the initial step similar to aerobic and anaerobic respiration; hence, it is a common pathway.
In aerobic conditions, pyruvate enters the citric acid cycle and undergoes oxidative phosphorylation leading to the net production of 32 ATP molecules.
In anaerobic conditions, pyruvate converts to lactate through anaerobic glycolysis.
Question 2
Which property of water is the result of an uneven distribution of electrons?
Answers
Answer:
Polarity
Explanation:
Water, is a chemical compound with the formula H2O. It posseses properties that makes it a unique substance on Earth. Among these properties is its POLAR NATURE. Polarity of a molecule refers to the separation of electric charges into dipole moment having an opposite charges at the end.
The polarity of water molecule is attributed to the uneven distribution of electrons in the atoms that forms it. Oxygen is a more electronegative atom than hydrogen, hence, it pulls most of the electrons towards itself, making hydrogen atom more electropositive. This forms the polar property of water.
what happened in apollo 12
Answers
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Apollo 12, the second manned mission to land on the Moon, was planned and executed as a precision landing. The astronauts landed the Lunar Module within walking distance of the Surveyor III spacecraft which had landed on the Moon in April of 1967.
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The first heart sound is described as lub and corresponds to which event of the cardiac cycle?
Answers
Answer:
The first heart sound correspond to the closure of atrioventricular valves which comprises of mitral and transcupid valves.
Explanation:
The first heart sounds is describe as lub and its correspond to the closure of atrioventricular valves which comprises of mitral and triscupid valves because it's coincides with ventricular contractions as the ventricular pressures surpasses the pressure of the atrial which mark the begining of ventricular systole and the end of mechanical diastole. It is a single sound because the mitral and triscupid valves closes simultaneously.
The type of membrane protein that gives cells specific identity are called:
Markers
Channels
Receptors
Pumps
Aquaporins
Answers
Answer:
Membrane markers allow cells to recognize one another, which is vital for cellular signaling processes that influence tissue and organ formation during early development. This marking function also plays a later role in the “self”-versus-“non-self” distinction of the immune response.
Explanation:
In which area would you expect to find thermal pollution?
ONear a farm
Near a recently cleared area of land with lots of erosion
ONear a power plant
Near an animal feedlot with significant manure runoff
Answers
Why are temperatures hotter in locations near the equator?
Answers
Describe the location of the positive charge of the atom in J. J. Thomson's plum pudding model.
|) the answer is B- evenly distributed throughout the entire atom.
Answers
Answer:
J. J. ... In Thomson's model, the atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges, like negatively charged “plums” surrounded by positively charged “pudding”.
Explanation:
9. Javier is a navigator for the navy His ship has just lost all power in the middle of the ocean, including access to your GPS. Which astronomical tool would be MOST helpful in this situation?
Answers
explain with examples,
simple explanation about the following disease a) flatulence b) heart burns
Answers
The correct answers are:
a) Flatulence: Excessive gas in the digestive system causing bloating and passing of gas.b) Heartburn: Burning sensation in the chest caused by stomach acid refluxing into the esophagus.a) Flatulence: Flatulence is the excessive accumulation of gas in the digestive system, resulting in bloating and the release of gas through the rectum. It is commonly caused by the digestion of certain foods that produce gas as a byproduct, such as beans, lentils, and carbonated drinks.
b) Heartburn: Heartburn is a burning sensation in the chest or throat caused by stomach acid refluxing back into the esophagus. It occurs when the lower esophageal sphincter fails to close properly, allowing acid to flow upward.
Common triggers include spicy foods, fatty foods, caffeine, and alcohol. The discomfort typically rises behind the breastbone and can be worsened by lying down or bending over. Antacids and lifestyle changes, such as avoiding trigger foods and eating smaller meals, can help alleviate heartburn symptoms.
In conclusion, flatulence refers to the excessive accumulation of gas in the digestive system, leading to bloating and gas release, while heartburn is characterized by a burning sensation in the chest caused by stomach acid reflux into the esophagus.
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A six-year-old Caucasian boy was seen by a maxillofacial surgeon to be evaluated for surgical repair of severe jaw misalignment. The boy was deemed an appropriate candidate for surgery at this time, with a second surgery planned during his teen years to complete the correction. The boy was adopted, and no family history was available. He had no personal history of excessive bleeding or bruising. The pre-surgical CBC results including platelet count were within reference ranges. Pre-surgical hemostasis testing is as follows: Ryan L. Reference RangePT 10.5 9-12 secondsAPTT 40 32-46 secondsBleeding time 7 1-9 minutesRequired:Describe the principle and reagents for the PT and APTT.
Answers
Answer: The PT and APTT are valuable blood clotting time determination principles.
Explanation:
The principle of PT or prothrombin test determines the time required for the clot formation when additional calcium factor is added.
The principle of APTT or activated partial thromboplastin time is a test which determines the time required for the formation of the blood clot after the adding the calcium and phospholipid factors. This process activates the different blood clotting factors in the blood responsible for clotting of blood.
If the word "diversity" means "variety" and the prefix "bio-" means "life", what do you think the word "biodiversity" in an ecosystem means?
Answers
Answer:it means a verity of life
Explanation:because like you said diversity means verity and bio means life
Which of the following events occur in ventricular diastole, and which occur in ventricular systole?
Answers
Ventricular filling and atrial contraction occur in ventricular diastole, while isovolumetric contraction and ventricular ejection occur in ventricular systole.
During the cardiac cycle, the heart undergoes two main phases: diastole and systole.
Diastole refers to the relaxation phase of the heart, while systole refers to the contraction phase.
Let's explore some of the events that occur during each phase:
Events that occur during ventricular diastole:
Ventricular Filling:
During this phase, blood flows from the atria into the ventricles through the open atrioventricular valves (mitral and tricuspid valves).
The ventricles are relaxed and passively receive blood from the atria.
Atrial Contraction:
Towards the end of ventricular diastole, the atria contract to push the remaining blood into the ventricles.
This helps to further fill the ventricles before they contract.
Events that occur during ventricular systole:
Isovolumetric Contraction:
The ventricles begin to contract, causing an increase in pressure within the chambers.
The atrioventricular valves (mitral and tricuspid valves) close to prevent the backflow of blood into the atria.
However, the semilunar valves (aortic and pulmonary valves) remain closed, resulting in no blood flow out of the ventricles during this phase.
Ventricular Ejection:
As the ventricular pressure surpasses the pressure in the aorta and pulmonary artery, the semilunar valves open, allowing blood to be ejected from the ventricles into the respective arteries.
This is the phase where blood is pumped out of the heart to the systemic and pulmonary circulation.
After ventricular systole, the heart returns to ventricular diastole to repeat the cycle.
In summary, ventricular diastole includes ventricular filling and atrial contraction, while ventricular systole includes isovolumetric contraction and ventricular ejection.
These events ensure proper blood flow and circulation throughout the body.
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What is necessary for social fulfillment in the three pillars of sustainability?
Answers
Social fulfillment in the three pillars of sustainability requires equity, justice, and the satisfaction of human needs.
In the context of sustainability, social fulfillment encompasses ensuring equity, justice, and meeting the basic needs of individuals and communities. The three pillars of sustainability—environmental, economic, and social—are interconnected and rely on each other for long-term success.
Social fulfillment is necessary to achieve a sustainable society. It involves promoting social equity, ensuring fair distribution of resources and opportunities, and addressing social challenges such as poverty, inequality, and discrimination. It also requires safeguarding human rights, providing access to education, healthcare, and social services, and fostering inclusive and participatory decision-making processes.Within the three pillars of sustainability, social fulfillment is crucial because it recognizes that sustainable development cannot be achieved without considering the well-being and quality of life of individuals and communities.It emphasizes the importance of balancing economic growth and environmental protection with social progress to create a more equitable and just society for present and future generations.
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USF The chromosomes of the species known as Vulcans together contain 24% adenine. Apply Chargaff’s rules to calculate the percentages of thymine, guanine, and cytosine bases in their genomes, respectively. Group of answer choices 26%, 24%, 26% 76%, 24%, 76% 24%, 26%, 26% 26%, 26%, 24% 24%, 52%, 52% Not enough information has been provided to calculate the other percentages. 24%, 24%, 24%
Answers
Answer:
Thymine = 26%,
Adenine = 26%
Guanine = 24%
Cytosine = 24%
Explanation:
Chargaff's stated that the DNA of any cell has the same content of purine (A and G) and pyrimidine (T and C) bases. In the DNA molecule, T pairs with A (T–A), and G pairs with C (G–C). In consequence, according to this base pair-rule, the amount of Thymine (T) should be equal to the Adenine (A), and the amount of Cytocine (C) should be equal to the Guanine (G).
In this example, the content of A is 26%, and thereby the amount of the remaining bases is: 48 % (26 + 26 = 52 >> 100 - 52 = 48), where C= 24% and G=24%.
In a DNA molecule, the proportion of Adenine equals the one of thymine, while the proportion of cytosine equals the one of guanine. The chromosomes contain 24% adenine, 24% thymine, 26% guanine, 26% cytosine.
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We know that in a DNA molecule, adenine pairs thymine, and cytosine pairs guanine. So,
the percentage of thymine equals the percentage of adeninethe percentage of guanine equals the percentage of cytosinethe sum of all the percentages equals 100%In the exposed example, we know that the chromosome has 24% of adenine. So it must have 24% thymine as well.
24% + 24% = 48%
100% - 48% = 52% ⇒ This percentage corresponds to guanine and cyosine.
26% Guanine + 26% cytosine, because they must be in the same proportion.
The chromosomes of the species known as Vulcans together contain 24% adenine, 24% thymine, 26% guanine, 26% cytosine.
Options:
26%, 24%, 26% ⇒ NO
76%, 24%, 76% ⇒ NO
24%, 26%, 26% ⇒ YES
26%, 26%, 24% ⇒ NO
24%, 52%, 52% ⇒ NO
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How does stirring affect the rate of dissolving the salt in the solution?
Answers
Stirring a solute into a solvent speeds up the rate of dissolving because it helps distribute the solute particles throughout the solvent
The stirrings solute into a solvent speeds up the rate of dissolving because it helps distribute the solute particles throughout the solvent.
7. Increased
and
dries out the ground
leaving
water to move to the atmosphere fewer clouds and less
precipitation, which can lead to
Answers
Answer:
Increased evaporation and transpiration dries out the ground leaving less water to move to the atmosphere fewer clouds and less precipitation, which can lead to drought conditions.
In some areas evaporation and transpiration from plants can be so high that the amount of water available to move to the atmosphere is significantly reduced. This is usually the case in areas that are lacking in open water resources.
As there is less water moving to the atmosphere, there will be less water condensing into clouds and thus less rain. If this persists, it can lead to a drought.
BIOL 101
War on Cancer - 10 Discoveries
Malignant brain tumors in adults are fast-growing cancers with median survival rates of 15
months, even with aggressive treatment. Researchers have been searching for genetic
"signatures" (characteristic groups of cancer-causing genes) that could help in defining the
kind of brain tumor the patient has. They hope to be better able to predict the course of the
disease and more accurately design the patient's course of treatment.
Does this lead to a) reduction of cancer risks b) correction of cancer genes c) destruction of
cancerous tissue
Answers
The research described in the given statement does not directly lead to a) reduction of cancer risks, b) correction of cancer genes, or c) destruction of cancerous tissue.
What does the research lead to?Instead, it focuses on identifying genetic signatures that could help in defining the type of brain tumor a patient has. The primary goal is to improve prediction of disease progression and design more accurate treatment plans for patients with malignant brain tumors.
This research contributes to better understanding and management of the disease, but it does not directly address the reduction of cancer risks, correction of cancer genes, or destruction of cancerous tissue.
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how do Euglena reproduce?
Answers
According to Newton's 1st law of motion, called the law of inertia, if you kick a soccer ball on a field of grass, it will stop because _____.
only you can make it stop
inertia makes it stop
friction from the grass makes it stop
it won't stop
Answers
Friction from the grass makes it stop.
Law of inertia states that every object will remain in its position or rest or in a straight line of uniform motion until it is compelled to change the sate by and outside action.
So here in this case if you kick a soccer ball on a field of grass, it will stop because of the friction on the grass ground. friction is a type of force which is acting here. when we kick the ball there is an inertia acting on the ball and it starts moving as the ball is moving the friction force is acting on the ball when the friction force is greater than the ball it will stop moving.
So the friction from the grass makes the ball to a stop
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.
Which organ system is the xylem and phloem of the plant part of? A)Digestive system
B)Endocrine system
C)Respiratory system
D)Vascular system
Answers
Answer:
C is correct ans
Explanation:
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Which of the following is a density-dependent factor?
a. food availability
b. volcanic eruptions
c. cold weather
Answers
Answer:
a) food availability
Density-dependent factors have varying impacts according to population size. Different species populations in the same ecosystem will be affected differently. Factors include food availability, predator density and disease risk. Density-independent factors are not influenced by a species population size.
if you have two steel plates, one hot and one cold, and separate them in a vacuum, which of the following statements is true?
Answers
If you have two steel plates, one hot and one cold, and separate them in a vacuum, the statements true is they can exchange heat because they give off light. The hot plate gives off more light energy (electromagnetic waves) and the cold plate gives off less energy.
Electrically charged particles that are being accelerated create electromagnetic waves, and these waves can then interact with other charged particles to impose force on them. The energy, momentum, and angular momentum of EM waves are transferred from their source particle to the matter they interact with. Due to their sufficient separation from the moving charges that produced them, electromagnetic waves that are free to spread out on their own (or "radiate") without the ongoing influence of those charges are known as electromagnetic radiation. As a result, the far field is another name for EMR. The electromagnetic (EM) fields close to the charges and current that directly formed them are referred to as the near field in this context, specifically the electromagnetic induction and electrostatic induction processes.
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The claim that two steel plates may exchange heat because they emit light is valid if you have two steel plates—one hot and one cold—and separate them in a vacuum. Electromagnetic waves are emitted from both the hot and cold plates, with the hot plate emitting greater energy.
Electromagnetic waves are produced when electrically charged particles are accelerated; these waves can then interact with other charged particles to exert force on them. The matter that EM waves interact with absorbs the energy, momentum, and angular momentum that was originally carried by its source particle. Electromagnetic waves that are sufficiently free to spread out (or "radiate") without the continuing effect of the moving charges that produced them are referred to as electromagnetic radiation. The distant field is thus another term for EMR. In this context, the term "near field" refers to the electromagnetic (EM) fields close to the charges and current that directly created them, notably the electromagnetic induction and electrostatic induction processes.
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URGENT
A steroid hormone approaches its target cell. Which will happen first?
The hormone will enter the nucleus
The hormone will combine with proteins to form lipoproteins
The hormone and its receptor will interact with the DNA
The hormone and its receptor will enter the cell’s nucleus
Answers
A steroid hormone approaches its target cell, therefore the hormone will enter the nucleus and is what will happen first which is therefore denoted as option A.
What is a Hormone?This is referred to as a chemical messenger which is released directly into the bloodstream and is responsible for the control of certain metabolic reactions occurring in the cell and an example is steroid hormone such as androgens.
In a situation whereby a steroid hormone approaches its target cell, it first passes through the plasma membrane before it then becomes adhered to the receptors which are present in the nucleus or cytoplasm.
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. Mushroom is under............
i. Genus
ii. Donail
iii. Taxonomy
iv. Species
Answers
Answer:
Mushrooms are classified under the categories of "Genus" and "Species" in taxonomy. The genus refers to a group or category that includes closely related species, while the species represents a specific type or kind of organism. So, the correct options for mushrooms would be "i. Genus" and "iv. Species."
look up animal stoat to see the cutest thing ever. Add attachments of the picture you saw. who ever does this first will get BRAINLIEST
Answers
Background: You are a senior scientist at the CDC. While reviewing reports you see that there is a new infection that has surfaced in a local county. The agent who managed the incident wrote this in their notes:
“…..Infection spreads rapidly through physical contact. Once on the skin, this organism is able to break down keratin and infect the lower portions of the dermis. This organism has a Gram+ cell wall, is circular in appearance and very small. While not a traditional medication, the patient responded well to a drug that targeted mitochondria….” Do you think that this is the best medication to use on the patient? Explain why this medication would or would not work.
Thanks!
Answers
While the notes indicate that the patient responded well to the drug, there is no information provided about the mechanism of action of the drug or the specific type of infection that the patient had. It is also unclear whether the drug was specifically designed to treat this type of infection or if it was used off-label.
Additionally, while the notes mention that the organism has a Gram+ cell wall and is circular in appearance, there is no information about its genetic makeup or other characteristics that could provide insight into the most effective treatment options.
Therefore, it is not possible to say definitively whether the drug that targeted mitochondria is the best medication to use on the patient without further information. As a senior scientist at the CDC, I would recommend conducting further research and testing to identify the most effective treatment options for this new infection.
Leketa is a secret agent. She needs to send secret messages to her partner, Daniel. Leketa uses the sound waves from the beat of a drum to send her messages. Leketa and Daniel create a secret code using a pattern of drum beats to communicate with one another. In which of the following places would using a drum work to send her secret messages?
A. The drum will work on Earth, under the water, and in outer space.
B. The drum will work on Earth and under the water. The drum will not work in outer space.
C. The drum will work on Earth and in outer space. The drum will not work under the water.
D. The drum will work under the water and in outer space. The drum will not work on Earth.
Why did you choose your answer to Question 4? Explain in terms of sound waves.
Answers
Answer:
C. The drum will work on Earth and in outer space. The drum will not work under the water.