/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none}

91影视

Log out

Learning Materials

Features

Discover

Chapter 10: Q5TYU (page 187)

Which of the following does notoccur during the Calvin cycle?

(A) carbon fixation

(B) oxidation of NADPH

(C) release of oxygen

(D) regeneration of the CO2 acceptor

Short Answer

Expert verified

a. The option 鈥渃arbon fixation鈥� is false.

b. The option 鈥渙xidation of NADPH鈥� is false.

c. The option 鈥渞elease of oxygen鈥� is true.

d. The option 鈥渞egeneration of the CO2 acceptor鈥� is false.

Step by step solution

01

Calvin cycle

The Calvin cycle is the light-independent reaction of photosynthesis that is anabolic. It means synthesizing molecules like carbohydrates by using small molecules like CO2 and ATP. It is the process in which CO2 is fixed by reacting with organic molecules, and NADPH is consumed as reducing power.

02

Explanation of option (A)

The first step in the Calvin cycle is carbon fixation, in which a molecule of CO2 is attached to RuBP (ribulose bisphosphate) with the help of RuBP carboxylase-oxygenase or rubisco. A six-carbon intermediate forms that immediately splits into two 3-phosphoglycerate molecules.

Thus, carbon fixation occurs in the Calvin cycle.

Therefore, the given option is false.

03

Explanation of option (B)

Each of the two 3-phosphoglycerate moleculesis phosphorylated by using ATP and 1,3-bisphosphoglycerate is formed that is reduced by NADPH. In this process, NADPH is oxidized by donating a pair of electrons. In this process, glyceraldehyde 3-phosphate is formed, which is a sugar.

Thus, NADPH is oxidized in the Calvin cycle.

Therefore, the given option is false.

04

Explanation of option (C)

Oxygen is released in the light reaction of the photosynthesis that needs sunlight. This step uses solar energy and converts it into chemical energy in the form of ATP. Water is split to release electrons, protons, and oxygen. Oxygen acts as a byproduct of the light reaction of photosynthesis.

Thus, oxygen is released in a light reaction, not in the Calvin cycle.

Therefore, the given option is true.

05

Explanation of option (D)

In the last step of the Calvin cycle, five molecules ofglyceraldehyde 3-phosphate are rearranged into three RuBP molecules that accept CO2 again, and the cycle occurs again.

Thus, the CO2 acceptor regenerates that isRuBP.

Therefore, the given option is false.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Draw a 鈥渂est fit鈥� line for each set of points. A best-fit does not necessarily pass through all or even most points. Instead, it is a straight line that passes as close as possible to all data points from that set. Draw a best-fit line for each set of data. Because the placement of the line is a matter of judgment, two individuals may draw slightly different lines for a given set of points. The line that actually fits best, a regression line, can be identified by squaring the distances of all points to any candidate line, then selecting the line that minimizes the sum of the squares. (See the graph in the scientific skills Exercise in Chapter 3) for an example of a linear regression line. Excel or other software programs, including those on a graphical calculator, can plot regression lines once data points are entered. Using either Excel or a graphical calculator, enter the data points for each data set and have the program draw the two regression lines. Compare them to the lines drawn.

Scientific evidence indicates that the CO2 added to the air by the burning of wood and fossil fuels is contributing to global warming, a rise in global temperature. Tropical rain forests are estimated to be responsible for approximately 20% of global photosynthesis, yet the consumption of large amounts of CO2 by living trees is thought to make little or no net contribution to reduction of global warming. Explain why this might be the case. (Hint: What processes in both living and dead trees produce CO2?).

Review Figures 9.9 and 10.19. Discuss the roles of intermediate and product played by glyceraldehydes 3-phosphate (G3P) in the two processes shown in these two figures.

Describe how photorespiration lowers photosynthetic output for plants.

How is photosynthesis similar in C4 plants and CAM plants?

(A) In both cases, only photosystem I is used.

(B) Both types of plants make sugar without the Calvin cycle.

(C) In both cases, rubisco is not used to fix carbon initially.

(D) Both types of plants make most of their sugar in the dark.

See all solutions

Recommended explanations on Biology Textbooks

Control of Gene Expression

Read Explanation

Substance Exchange

Read Explanation

Cells

Read Explanation

Biological Molecules

Read Explanation

Reproduction

Read Explanation

Astrobiological Science

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.