Question #1:Which of the following is false about the light reactions of photosy
ID: 60250 • Letter: Q
Question
Question #1:Which of the following is false about the light reactions of photosynthesis?
a.) PSII oxidizes water and PSI reduces NADP+
b.) The chlorophylls of photosynthesis are oxidized by input of light energy
c.) ATP production in PSII occurs in a manner mechanistically similar to the mitochondrial ETC
d.) ATP and NADH produced by the light reactions are important for glucose production in the Calvin cycle
e.) Both b and d
Question #2: The light reactions of photosynthesis are opposite to the ETC because in photosynthesis, redox molecules are reduced and oxygen is produced.
a.) True
b.) False
Question #3:What is the role of the Fe-S cluster in Photosystem II?
a.) It only accepts electrons from the previous carrier in the Z-scheme
b.) It is a roadblock for protons and helps build up the pH gradient between the stroma and intermembrane space.
c.) It results in buildup of protons in the stroma of the chloroplast
d.) It helps in the oxidation of water to form oxygen
e.) both a and b
Question #4:After the CO2 fixation step in photosynthesis, the production of glucose:
a.) Takes place via a process nearly identical to gluconeogenesis
b.) Requires NADPH from the light reactions of photosynthesis
c.) Uses 12 ATP from the light reactions of photosynthesis
d.) Arises from 2 of the 12 glyceraldehyde-3-phosphate that come from CO2 fixation
e.) All of the above
Question #5:Plants generate all of the ATP they need for their energy needs through photosynthesis and do not use glycolysis for ATP production.
a.) True
b.) False
Explanation / Answer
1. The chlorophylls of photosynthesis are oxidized by input of light energy is false, the chlorophylls are excited by absorbing light energy but not oxidized. Option b is correct.
2. The light reactions of photosynthesis are opposite to the ETC because in photosynthesis, redox molecules are reduced and oxygen is produced is false. The ETC is similar in photosynthesis and mitochondria. Option b is correct.
3. Role of the Fe-S cluster in Photosystem II is It only accepts electrons from the previous carrier in the Z-scheme. Option a is correct.
4. After the CO2 fixation step in photosynthesis, the production of glucose requires NADPH from the light reactions of photosynthesis. Option b is correct.
5. Plants generate all of the ATP they need for their energy needs through photosynthesis and do not use glycolysis for ATP production is true. Option a is correct.