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Chapter 8: Q. 27 (page 225)

What are the roles of ATP and NADPH in photosynthesis?

Short Answer

Expert verified

NADPH is employed as a reducing agent while ATP is used to supply energy for numerous endogenic reactions in the Calvin cycle or dark reactions.

Step by step solution

01

Introduction

Photosynthesis is the process by which green plants and some other creatures manufacture nutrients from carbon dioxide and water using sunshine.

The energy carriers are ATP (adenosine triphosphate) and Nicotinamide adenine dinucleotide phosphate hydrogen. ATP hydrolyzes to generate ADP, while NADPH oxidizes to NADP+, releasing energy and electrons for various metabolic processes, respectively.

02

Explanation

During light independent or dark processes during photosynthesis, ATP and NADPH are employed to supply energy and as a reducing agent for the fixation of carbon dioxide to glucose.

The conversion of 1, 3-biphophoglycerate to glyceraldehyde phosphate requires ATP. It's also employed in the conversion of ribulose-5-phosphate to ribulose 1, 5-biphosphate.

During the Calvin cycle's reduction phase, NADH is needed to convert 1, 3-biphosphoglycerate to glyceraldehyde-3-phosphate.

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Most popular questions from this chapter

Imagine a sealed terrarium containing a plant and a beetle. How does each organism provide resources for the other? Could each organism survive if it was the only living thing in the terrarium? Why or why not?

How are the NADPH and G $3$ P molecules made during photosynthesis similar?

a. They are both end products of photosynthesis.

b. They are both substrates for photosynthesis.

c. They are both produced from carbon dioxide.

d. They both store energy in chemical bonds.

Which statement about thylakoids in eukaryotes is not correct?

a. Thylakoids are assembled into stacks.

b. Thylakoids exist as a maze of folded membranes.

c. The space surrounding thylakoids is called stroma.

d. Thylakoids contain chlorophyll.

Describe the pathway of electron transfer from photosystem II to photosystem I in light dependent reactions.

If four molecules of carbon dioxide enter the Calvin cycle (four “turns” of the cycle), how many $G_{3} P$ molecules are produced and how many are exported?

a. $4$ $G_{3} P$ made, exported

b. localid="1650643144705" $4$ $G_{3} P$ made, localid="1650643151304" $2$ localid="1650643155984" $G_{3} P$ exported

c. localid="1650643160088" $8$ localid="1650643164650" $G_{3} P$ made, localid="1650643169159" $1$ localid="1650643173326" $G_{3} P$ exported

d. localid="1650643177416" $8$ localid="1650643181257" $G_{3} P$ made, localid="1650643185508" $4$ localid="1650643189131" $G_{3} P$ exported

See all solutions

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