Photosynthesis can be divided into two steps: the light-dependent reactions and the Calvi cycle. Which of the following correctly describes the overall process of the Calvin cycle? A) The Calvin cycle occurs in the thylakoid membrane of chloroplasts
B) During the Calvin cycle, carbon is oxidized.
C) ATP and NADPH produced by the light reactions are used by the Calvin cycle to make carbohydrates
D) The Calvin cycle breaks down carbohydrates into simpler molecules

Answers

Answer 1

Answer:

Answer:

C) ATP and NADPH produced by the light reactions are used by the Calvin cycle to make carbohydrates

Explanation:

The light-dependent reactions of photosynthesis form ATP and NADPH. These reactions occur in the thylakoid membrane of chloroplasts.

The light-independent reactions of photosynthesis, the Calvin cycle occurs in the stroma of chloroplast as the enzymes for the reactions of the Calvin cycle are present in the stroma.

During the Calvin cycle, the atmospheric carbon dioxide is fixed into glucose using the ATP as an energy source and NADPH as the electron donor for redox reactions.

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Scientist can determine the age of ancient objects by a method called radiocarbon dating. The bombardment of the upper atmosphere by cosmic rays converts nitrogen to a radioactive isotope of carbon, 14C, with a half-life of about 5730 years. Vegetation absorbs carbon dioxide through the atmosphere and animal life assimilates 14C through food chains. When a plant or animal dies, it stops replacing its carbon and the amount of 14C begins to decrease through radioactive decay. Therefore, the level of radioactivity must also decay exponentially. A parchment fragment was discovered that had about 64% as much 14C radioactivity as does plant material on Earth today. Estimate the age of the parchment. (Round your answer to the nearest hundred years.) yr

Answers

Answer:

$3688.323$ years

Explanation:

Given-

Half life of $14$ C $= 5730$ years

As we know -

$A_((t)) = A_0e^(kt)$

Where

$A_((t)) =$ Mass of radioactive carbon after a time period "t"

$A_0=$ initial mass of radioactive carbon

$k =$ radioactive decay constant

$t =$ time

First we will find the value of "k"

$(1)/(2) = (1)*e^(k*5730)\n$

On solving, we get -

$e^(5730*k)= 0.5\n5730*k = ln(0.5)\nk = -0.000121$

Now, when mass of 14C becomes $64$ % of the plant material on earth today, then its age would be

$A_((t)) = A_0*e^((-0.000121*t))\nA_((t))= 0.64*A_0\n0.64*A_0 = A_0*e-^((0.000121*t))\nt = 3688.323$ years

Which of the following statements regarding angiotensin II is(are) correct? I. Angiotensin II is a hormone that is secreted by the kidneys.
II. A well-hydrated person is likely to have higher blood levels of angiotensin II than a dehydrated person.
III. Angiotensin II helps to slow the rate at which urine is produced.
IV. A class of drugs known as ACE inhibitors promote (enhance) the formation of angiotensin II.

Answers

Answer:

I. Angiotensin II is a hormone that is secreted by the kidneys.

Explanation:

The angiotensin II is a vasoconstrictor molecule secreted by the kidney. This hormone is known to be involved in the regulation of blood pressure and has effects on water and sodium intake.

Angiotensin II plays roles in the immune response and in the regulation of inflammatory response pathways

Bacteria and other microbes can be used to "clean up" an oil spill by breaking down oil into carbon dioxide and water. Two samples isolated from the Deepwater Horizon leak in the Gulf of Mexico were labeled A and B. The DNA of each was isolated and the percent thymine measured in each sample. Sample A contains 20.520.5 % thymine and sample B contains 30.730.7 % thymine. Assume the organisms contain normal double‑stranded DNA and predict the composition of the other bases.

Answers

Answer:

In sample A,

The percentage of thymine or T is 20.5 %. A = T, so the percentage of A will also be 20.5 %.

Thus, A + T = 20.5 + 20.5 = 41 %

Therefore, G + C = 100 - 41 = 59 %

So, G = 59 /2 = 29.5 %

Also. G = C = 29.5 %

In sample B,

The percentage of Thymine or T is 30.7 %. As A = T, so A will also be 30.7 %.

Thus, A + T = 30.7 + 30.7 = 61.4 %

Also, G + C = 100 - 61.4 = 38.6 %

So, G = 38.6 / 2 = 19.3 %

Therefore, C will also be 19.3 %. As GC content is more found in the sample A, that is, 59 %. Hence, the sample A will possess the higher temperature to denature in comparison to B.

Will give 15 PointsBased on this graph, which type of gas is the most common in Earth's atmosphere?

Answers

Answer:

based on the graph the most common gas in the atmosphere would be nitrogen

What is difference between respiration and photosynthesis?

Answers

Answer:

Respiration is a vital process carried out by the human being where he breathes oxygen gas and emits carbon dioxide .. As for the photosynthesis process, it is a process by which plants produce oxygen gas and absorb carbon dioxide.

Answer:

Photosynthesis involves the use of energy from sunlight, water and carbon dioxide to produce glucose and oxygen. Cellular respiration uses glucose and oxygen to produce carbon dioxide and water.

In this activity, you will use presentation software to create a presentation of 15 to 20 slides explaining your arguments in support of or against the following statements:AIDS continues to be a global health crisis.
AIDS still meets the definition of a pandemic.

Your claims should be supported by scientifically complete evidence.
Follow the steps provided to research, plan, and create your presentation. This guide about the research process can help.

Time to complete: 2 to 3 hours

Part A: Ask Questions
Begin by creating a list of questions to guide your research and help you form a convincing argument. Your presentation should answer some of these questions:
What is the definition of a pandemic?
How does a pandemic differ from an endemic or epidemic?
What is the life cycle of the HIV virus once it enters the body? How does the genetic code
of the virus change?
How does HIV affect the body?
How do people become infected with HIV?
How does AIDS develop from an HIV infection?
What are the current infection rates of HIV across the globe?
Where is HIV/AIDS most prevalent?
What treatments are currently available for HIV/AIDS?
Do some regions of the world have better access to treatments than others?
What is the average life expectancy for someone with HIV?
Does life expectancy differ around the globe?
Now write four additional questions about HIV/AIDS that could help strengthen your argument in the presentation.

Answers

Based on the information given, a pandemic simply means the spread of an infectiousdisease.

What is HIV?

It should be noted that the difference between an epidemic and a pandemic is the degree if its spread.

HIV is simply a virus that attacks the immune system. It can be gotten through unprotected intercourse, sharing sharp objects, etc. It should be noted that in the long run, HIV leads to AIDS.

It should be noted that HIV is most prevalent in Sub Saharan Africa. There are presently no cure for HIV but there are medications to control the complications.

The average life expectancy for someone with HIV is 56 years.

Learn more about pandemic on:

brainly.com/question/19381375

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Bacteria and other microbes can be used to "clean up" an oil spill by breaking down oil into carbon dioxide and water. Two samples isolated from the Deepwater Horizon leak in the Gulf of Mexico were labeled A and B. The DNA of each was isolated and the percent thymine measured in each sample.Sample A contains 21.3 % thymine and sample B contains 27.7 % thymine.Assume the organisms contain normal doubleâstranded DNA and predict the composition of the other bases..Percent adenine in sample A:

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