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Chapter 8: 27.question (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

step-1: definition

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

02

step-2: Introduction

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.

03

step-3: 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

Where in eukaryotic cells does the Calvin cycle take place?

a. thylakoid membrane

b. thylakoid lumen

c. chloroplast stroma

d. granum

How many photons does it take to fully reduce one molecule of NADP+ to NADPH? a. 1

b. 2

c. 4

d. 8

From which component of the light-dependent reactions does NADPH form most directly?
a. photosystem II
b. photosystem I
c. cytochrome complex
d. ATP synthase

Predict the end result if a chloroplast’s light-independent enzymes developed a mutation that prevented them from activating in response to light.

a. G3P accumulation

b. ATP and NADPH accumulation

c. Water accumulation

d. Carbon dioxide depletion

Why does it take three turns of the calvin cycle to produce G3P, the initial product of photosynthesis?
See all solutions

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