Photosynthesis: the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
Which elements atoms have 2 electrons in the first energy level and 4 electrons in the second energy level?
A. Carbon
B. Nitrogen
C. Helium
D. None of the above
Answer:
Carbon
Explanation:
Carbon has 2 electrons in the first energy level and 4 electrons in the third energy level.
which one has a curved shell domed tortoises or saddle back tortoises?
Answer:
Domed tortoises
Explanation:
It's in the name - 'dome'
pepsin hydrolyzes proteins in the stomach. the ph in the stomach is 2, and the optimum ph for pepsin is 2. what do you think would happen to the activity of pepsin when it reaches the small intestine, where the ph is 8? explain why.
The activity of pepsin would gradually decreases when it is exposed to higher pH in the small intestine. This is because in higher pH the enzyme pepsin denatures.
What is the role of pepsin in the stomach?The role of Pepsin in the stomach is determined by the fact that it serves to digest proteins found in ingested food. The Gastric chief cells typically secrete pepsin as an inactive zymogen called pepsinogen.
Parietal cells within the stomach lining effectively secrete hydrochloric acid that ultimately decreases the pH of the stomach. A low pH (1.5 to 2) activates pepsin.
It is thought that the role of pepsin is better played in the pH lies between 1.5-2. But when pepsin enters the region of the small intestine, the pH gradually increases and reaches 8. At this, the activity of pepsin is inhibited due to its denaturation.
Therefore, the activity of pepsin would gradually decrease when it is exposed to higher pH in the small intestine. This is because in higher pH the enzyme pepsin denatures.
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which of the following events occurs in eukaryotic cells but not in prokaryotic cells? rna polymerase attaches to a particular nucleotide sequence on the dna rna is synthesized using the 3' to 5' strand as a template two or more structural genes are transcribed onto a signle rna molecule mrna transcripts are extensively modified before they leave the nucleus trnas, rrnas, and mrnas are all involved in the translation process
The event that occurs in eukaryotic cells but not in prokaryotic cells is "mRNA transcripts are extensively modified before they leave the nucleus."
In eukaryotic cells, mRNA transcripts undergo various modifications such as the addition of a 5' cap, 3' poly-A tail, and splicing of introns before they leave the nucleus. These modifications protect the mRNA from degradation, facilitate nuclear export, and enhance translation efficiency. In prokaryotic cells, there is no nucleus, and mRNA transcripts are not extensively modified before translation.
The key difference between eukaryotic and prokaryotic cells in this context is the modification of mRNA transcripts in eukaryotes before they leave the nucleus, which does not occur in prokaryotes due to the absence of a nucleus.
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Does having two eyes instead of one improve the human ability to resolve distant objects? explain.
We can view in the third degree of depth thanks to it. Each eye sees a slightly different image because our human eyes are a few inches apart. The two images are combined in our brain to determine the separation of the items.
Why is it advantageous for humans to have two eyes as opposed to just one?We develop stereoscopic vision, or the capacity to recognize and comprehend three-dimensional space from any visual inputs, with the assistance of two eyes. With both eyes open, you can see 180°, compared to 150° with just one eye. This gives us a greater field of view. Whereas, when we close one eye, we get the angle till our nose blocks the view. We, humans, are largely binocular beings.
Our ability to perceive depth and perceive the environment in three dimensions is really improved by having two eyes. Because of the distance between our eyes, this truly works. Each image that is sent onto the retina by each eye is slightly different because each eye views things from slightly different angles.
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According to lecture, the level of emission reductions pledged by individual countries at the paris climate agreements are sufficient to prevent dramatic climate change according to many scientists. True or false?.
According to lecture, the level of emission reductions pledged by individual countries at the paris climate agreements are sufficient to prevent dramatic climate change according to many scientists. The statement is False.
The issue is that many scientists believe the existing pledged emission reductions won't stop serious climate change.Leading the way in global efforts to combat climate change has been the EU. It played a key role in negotiating the Paris Agreement and continues to lead the world.
The EU presented its updated and improved NDC in December 2020, along with information to promote the ICTU (clearness, transparency, and understanding) of the NDC and a target to cut emissions by at least 55% from 1990 levels by 2030.
By working together, the EU and its Member States are committed to a legally-binding goal of a net domestic reduction of greenhouse gas emissions of at least 55% from 1990 to 2030.
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Xeroderma pigmentosum (XP) causes skin cancer as a result of a genetic disorder in which _____ causes mutations that are not repaired due to a faulty _____ mechanism.
Xeroderma pigmentosum (XP) causes skin cancer as a result of a genetic disorder in which DNA damage causes mutations that are not repaired due to a faulty DNA repair mechanism.
Xeroderma pigmentosum (XP) is a rare genetic disorder that leads to a heightened risk of skin cancer. In individuals with XP, exposure to ultraviolet (UV) radiation causes DNA damage, which in turn results in mutations. These mutations are not repaired properly due to a faulty DNA repair mechanism known as nucleotide excision repair (NER).
Under normal circumstances, NER effectively identifies and rectifies UV-induced DNA damage, thus maintaining genomic integrity. However, in XP patients, defects in one or more genes involved in the NER pathway lead to an impaired repair system. Consequently, the accumulation of DNA damage and mutations increases the likelihood of skin cancer development.
To minimize the risk of skin cancer in XP patients, it is crucial to limit their exposure to UV radiation, typically from sunlight. Protective measures include wearing sun-protective clothing, using broad-spectrum sunscreen, and avoiding sun exposure during peak hours. Early diagnosis and ongoing monitoring are also essential in managing XP and its associated risks.
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Read the passage about the fluoridation of drinking water.
Since the early 1960s, fluoride has been added to many sources of drinking water to prevent cavities in teeth. This is called fluoridation. There are some who say that this is unnecessary and increases the risk of cancer.
In 1993, the Subcommittee on Health Effects of Ingested Fluoride of the National Research Council, part of the National Academy of Sciences, conducted an extensive study about the link between fluoridated drinking water and increased cancer risk. The study included data from more than 50 human disease studies and six animal studies. The Subcommittee concluded that none of the data showed a link between fluoridated drinking water and cancer. A 1999 report by the CDC supported these findings. The CDC report concluded that studies so far have produced "no credible evidence” of a link between fluoridated drinking water and an increased risk for cancer.
According to the article, what valid claim came from the National Research Council?
A. There is no link between fluoride exposure and increased cancer risk in humans.
B. There is a possible link between fluoride exposure and increased cancer risk in humans.
C. There is a definite link between fluoride exposure and increased cancer risk in humans and animals.
D. There is a possible link between fluoride exposure and increased cancer risk in animals.
Answer: A. There is no association between fluoride exposure and increased cancer risk in humans.
Explanation: just did it.
According to the text, adolescents are deficient in their intake of necessary vitamins and minerals because _____
Answer:
healthy foods cost more.
unhealthy foods are more desirable.
they eat from vending machines in schools.
All of these answers are correct.
Explanation:
what does elute mean in the context of dna extraction?
"In the context of DNA extraction, "elute" means to extract or remove the DNA from the column by adding a specific buffer or solution that washes the DNA from the column.
Elution is the process of washing the DNA sample out of the solid support by adding elution buffer or water. The DNA then becomes available in the eluate for downstream processing.The DNA can be eluted in many different ways, such as with ethanol, salt, or water. However, each of these methods requires specific conditions to ensure that the DNA is not damaged or lost during the extraction process.
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Students conducted an experiment observing the motion of beetles walking along the ground. During the experiment, one of the beetles
moved quickly away from the starting point, stopped for a short time then returned to the starting point at a slower speed.
Which graph shows the motion of the beetle observed in the experiment?
Position
Position
Time
Time
Position
ca
Position
Time
Time
Please hurry
Answer:
where is the graph???????
The zone richest in life is the _____ zone.
Question options:
Intertidal
All of these
Photic
Aphotic
The zone richest in life is the Intertidal zone. The correct option is D.
What is an Intertidal?The intertidal zone is a zone that is present in between the ocean and the land. This is the part where the ocean water meets the land. This area contains animals that live in the water and the animals that live in the ocean.
The photic zone is the zone of the ocean that contains sunlight and where the sunlight passes through. The aphotic zone is the zone in which sunlight does not go. This is preset in the bottom of the water bodies,
Thus, the correct option is D. Intertidal.
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what can the reader conclude about ecosystems based on the information of this passage
Answer: Ecosystems are so developing entities of biological communities
Explanation:
What is the advantage of protecting entire ecosystems rather than individual species?
Chances of survival increase because the species is part of all the important relationships it needs for ultimate survival.
Chances of survival increase because the species will be protected by environmental societies.
There is no advantage of protecting an entire ecosystem.
Individual species can be replaced.
The advantage of protecting entire ecosystems rather than individual species is Chances of survival increase because the species will be protected by environmental societies.
Conservation of ecosystem is essential for maintaining proper functioning of ecosystems, that include steady food supply, water supply and circulation of other important resources. Conservation of ecosystem also protects plant, animal, microbial and genetic resources for food production, agriculture, and ecosystem functions such as fertilizing the soil, recycling nutrients.
Hence, ecosystems provide important services for life to be maintained and grow continuously without any alteration . Biodiversity plays a major role in maintaining the balance of the earth.
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Why do you think milk is pasteurised?
the loss of water in the urine due to unreabsorbed solutes is known as
The loss of water in the urine due to unreabsorbed solutes is known as osmotic diuresis. Osmotic diuresis refers to the increased production of urine caused by the presence of osmotically active substances in the renal tubules.
Normally, the kidneys reabsorb water and solutes from the filtrate to maintain water balance in the body. However, in certain conditions, such as uncontrolled diabetes mellitus or the administration of certain medications, high levels of solutes, such as glucose or mannitol, may be present in the renal tubules. These solutes create an osmotic gradient that prevents the reabsorption of water, resulting in increased urine production. As a consequence, excessive amounts of water are lost in the urine, leading to dehydration and electrolyte imbalances if not managed appropriately.
Osmotic diuresis can occur in conditions like uncontrolled diabetes mellitus, where glucose levels in the blood are elevated. In this case, the renal threshold for glucose reabsorption is exceeded, leading to glucose spilling into the urine. The presence of glucose in the renal tubules creates an osmotic force that prevents the reabsorption of water, resulting in increased urine output. Similarly, the administration of certain medications, such as mannitol, can also cause osmotic diuresis by increasing the osmotic pressure in the renal tubules. It is important to address the underlying cause of osmotic diuresis and manage it accordingly to prevent dehydration and electrolyte imbalances.
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Cellular respiration converts chemical energy into.
Cellular respiration converts chemical energy into ATP.
Cellular respiration is the process that cells use to produce energy by converting chemical energy stored in glucose molecules into ATP. ATP (adenosine triphosphate) is the energy currency of the cell that powers all cellular processes. It is formed through a series of chemical reactions that occur in the mitochondria of the cell.
Cellular respiration can be broken down into three main stages: glycolysis, the citric acid cycle, and the electron transport chain. During glycolysis, glucose is broken down into pyruvate, producing a small amount of ATP and NADH. In the citric acid cycle, pyruvate is further broken down and produces more ATP and NADH. Finally, during the electron transport chain, NADH and other electron carriers are used to produce a large amount of ATP.
In summary, cellular respiration converts chemical energy stored in glucose molecules into ATP, which is the energy currency of the cell and powers all cellular processes.
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Which part of the wave is changed when there is interference?
the amplitude
the crest
the trough
the wavelength
Answer:
the amplitude.
Explanation:
The reason why is because an interference is when 2 waves combine to form a wave with a smaller amplitude than either the original wave...It occurs when the crest of one waves overlapes the trough of another wave
Which statement best describes the observations made by students after spraying water on the model to simulate rain?
Answer: the answer is surface runoff, you’re welcome
Explanation:
I just took this test and got a 100
What kind of rock would you expect continental plates to be made of? *
A)basaltic
B)granitic
C)oliometagraphic
D)prepubescent
Answer:
B)granitic
Explanation:
Answer:
granitic
Explanation:
the continental crust is compost mostly of granite
which enzyme would be required for the entry of hexadecanoic acid into both fatty acid degradation and fatty acid elongation pathways
The pyruvate dehydrogenase enzyme complex present in mitochondria catalyzes the oxidative decarboxylation of pyruvate to acetyl CoA.
Acetyl CoA carboxylase is the key enzyme in the regulation of fatty acid synthesis because it provides the building blocks necessary for fatty acid carbon chain elongation. A fatty acid desaturase is an enzyme that removes two hydrogen atoms from a fatty acid, creating a carbon or carbon double bond. Acetyl CoA carboxylase is the key enzyme in the regulation of fatty acid synthesis because it provides the building blocks necessary for carbon chain elongation of fatty acids. The liver releases bile, which contains lecithin, bile salts, and emulsifiers that help break down even more fat. Bile sticks to fat, and emulsifiers increase its surface area, facilitating the action of digestive enzymes. After this, enzymes break down the fatty acids.
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what role does isolation play in adaptive radiation ??
Answer:
Such exploitation of a new environment gives rise to an evolutionary pattern called adaptive radiation. Through migration, isolation, or possibly a new mutation giving rise to a brand new adaptation, a population of organisms moves into a new geographic area where that species never previously existed.
SITUATION: Teddy wants to prove if gravity really acts on each object. He used a paper and crumpled paper. He threw it at same time in same height.
–Answer 1-5 each question.
–Plsss can someone answer my question? :<
1. Do you think the 2 objects will hit the floor first?
2. What makes one objects hits the floor first?
3. What factor affects the movement of 2 objects in going down?
4. Did he prove that gravity acted upon the two objects? How?
Scientists are concerned about the rising levels of carbon dioxide (CO 2). What trait about this gas makes it so concerning to scientists?
Answer:
It is a greenhouse gas i.e. Its ability to contribute to Global Warming.
Explanation:
Carbondioxide (CO2) is one of the world's colorless, odorless and tasteless gases in air. It is the major product of cellular respiration by living organisms. The increase in level of CO2 in the atmosphere is a major concern to scientisits because they have the ability to trap heat, hence, called a GREENHOUSE GAS.
CO2, in conjunction with other gases like methane, are responsible for keeping the earth warm as they help trap heat energy from the sun. However, an increase in the level of these greenhouse gases is contributing to what is called Global Warming, which is the gradual increase in the temperature of the earth's atmosphere.
HELP NOW 70 POINTS! In the United States, Canada, and many European nations, the total fertility rate has fallen below the replacement rate. What economic and social consequences do you think might result from below replacement fertility rates?
Answer:
Answer in bold
When the fertility rate falls below replacement level, the population grows older and shrinks, which can slow economic growth and strain government budgets.
Explanation:
How dose this author use parentheses to explain ph
The author use parentheses to explain pH through the power of Hydrogen.
What is the power of hydrogen?The power of hydrogen (pH) is a measure of the acidity or basicity (alkalinity) of a solution. It is defined as the negative logarithm (base 10) of the concentration of hydrogen ions (H+) in moles per liter (M) of the solution. The pH scale ranges from 0 to 14, with 7 being neutral.
Solutions with a pH below 7 are acidic, while those with a pH above 7 are basic (alkaline). A change in pH of 1 unit represents a tenfold change in the concentration of H+ ions. The pH of a solution is an important parameter in many biological, chemical, and environmental processes, as it affects the solubility, reactivity, and stability of substances.
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a disease infects many ant colonies in a forest. the disease does not affect anteaters, but kills most of the ants. what is most likely to happen to the anteaters?
A disease infects many ant colonies in a forest. the disease does not affect anteaters, but kills most of the ants. what is most likely to happen to the anteaters many of the young anteaters will die.
Infectious diseases are illnesses caused by organisms like bacteria, viruses, fungus, or parasites. Many creatures inhabit and dwell on human body. They are usually innocuous or even beneficial. However, certain microbes can cause illness under particular conditions.
Some infectious illnesses are transmissible from person to person. Some are spread by insects and other animals. You can get others by eating contaminated food or drinking polluted water, or by being exposed to organisms in the environment.
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1
1 point
A genetic mutation causes a snake to have brown skin. After many generations, most of the
snake population has the brown skin mutation.
e
Which of the following most likely caused this change?
Snakes with the brown skin mutation are able to survive and reproduce more
successfully than snakes without it.
The same mutation occurred in other snakes in response to environmental conditions.
All the snakes in the area were infected with the mutation.
The other snakes changed their colors to mimic the brown snake.
2
1 point
Lo
Answer:
I think the answer is B. "The same mutation occurred in other snakes in response to enviromental conditions.
Explanation
Answer:
Snakes with the brown skin mutation are able to survive and reproduce more
successfully than snakes without it.
Explanation:
i already aswered this question correctly .
there is substantial agreement in bioethics on the general moral principles that should apply to human research, which are:group of answer choicesautonomy, control, and justice.autonomy, beneficence, and justice.autonomy, beneficence, and equipoise.autonomy, justice, and control.
In bioethics, there is substantial agreement on the general moral principles that should apply to human research, which are autonomy, beneficence, and justice.
The principles of autonomy, beneficence, and justice are widely recognized as the foundational moral principles that should guide human research.
Autonomy refers to respecting individuals' right to make their own informed decisions and participate voluntarily in research. It emphasizes obtaining informed consent from participants and ensuring their autonomy is upheld throughout the research process.
Beneficence involves promoting the well-being of research participants and minimizing potential harms. It requires researchers to maximize the potential benefits of the research while minimizing risks and ensuring that the research design is scientifically sound.
Justice pertains to the fair distribution of the benefits and burdens of research. It includes considerations of equitable participant selection, fair access to research opportunities, and the avoidance of exploitative practices.
These three principles together provide a framework for ethical decision-making in human research, ensuring respect for individual autonomy, promoting well-being, and upholding fairness.
While there may be different interpretations and applications of these principles in specific cases, their importance and general acceptance in bioethics are widely recognized.
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Please help!!
the nitrogen cycle starts with
atmospheric gas being fixed into nitrates
nitrates absorbed by plants
plants passing the nitrogen compounds through to other organisms
decomposers returning nitrogen into soil and atmosphere
Answer:
Denitrification
Explanation:
In the fifth stage of the nitrogen cycle, nitrogen returns to the air as nitrates are converted to atmospheric nitrogen (N2) by bacteria through the process we call denitrification.