Thanks a lot for your help. I have completed my multiple choice questions and wa
ID: 175725 • Letter: T
Question
Thanks a lot for your help. I have completed my multiple choice questions and want to double check my answers before submitting it. I don't really need an explanation for the questions.
24. The high concentration of protons in the intermembrane space of mitochondria originates from
a. glycolysis.
b. pyruvate oxidation.
c. reactions in the electron transport chain.
d. synthesis of ATP.
e. all of the above.
25. Which of the following substances is/are involved in the regulation of aerobic respiration?
a. ATP
b. citrate
c. NADH
d. AMP
e. all of the above
26. In the absence of the light reactions of photosynthesis, which components would be required to make the Calvin cycle proceed?
a. water and light
b. chlorophyll a
c. ATP and NADPH
d. only NADPH
e. carotenoids and chlorophyll
27. Which of the following is NOT correct for rubisco?
a. It is the most abundant enzyme.
b. It catalyzes two different reactions.
c. It is involved in photorespiration.
d. It is not used by CAM plants.
e. It is not efficient in fixing CO2.
28. Which of the following is NOT true for CAM plants?
a. They lack bundle sheath cells.
b. They do not use the Calvin cycle.
c. They are common in hot, dry environments.
d. PEP carboxylase is a key enzyme.
e. CAM plants prevent photorespiration.
29. Which of the following components is not crucial for cyclic electron transport in photosynthesis?
a. photosystem I
b. photosystem II
c. light
d. ferredoxin
e. plastocyanin
30. To produce two molecules of O2, how many photons must be absorbed through photosynthesis?
a. 4
b. 8
c. 16
d. 32
e. none of the above
Explanation / Answer
24.The high concentration of protons in the intermembrane space of mitochondria originates from:
c. reactions in the electron transport chain.
25. Which of the following substances is/are involved in the regulation of aerobic respiration?
e. all of the above
26. In the absence of the light reactions of photosynthesis, which components would be required to make the Calvin cycle proceed?
Since, the Calvin cycle refers to the light-independent reactions in photosynthesis that take place in three key steps. Although the Calvin Cycle is not directly dependent on light, it is indirectly dependent on light since the necessary energy carriers (ATP and NADPH) are products of light-dependent reactions (boundless).
Hence the option:
c. ATP and NADPH
27. Which of the following is NOT correct for rubisco?
d. It is not used by CAM plants. As in Crassulacean acid metabolism, also known as CAM photosynthesis, is a carbon fixation pathway that evolved in some plants as an adaptation to arid conditions. The pre-collected CO2 is concentrated around the enzyme RuBisCO, increasing photosynthetic efficiency.
28. Which of the following is NOT true for CAM plants?
a. They lack bundle sheath cells.
29. Which of the following components is not crucial for cyclic electron transport in photosynthesis?
e. plastocyanin
30. To produce two molecules of O2, how many photons must be absorbed through photosynthesis?
In Photosystem II (the water-splitting part), each photon absorbed will release one hydrogen atom from a water molecule. To get two molecules of O2, you need to do split four molecules of H2O. Thus 8 photons have freed 8 hydrogen atoms from water, producing 2 molecules of O2. Note that another 8 photons will be later absorbed in Photosystem I.
b. 8
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