Skip to main content
Ch. 10 - Photosynthesis
Campbell - Campbell Biology 11th Edition
Urry11th EditionCampbell BiologyISBN: 9789357423311Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoUrry 11th EditionCh. 10 - PhotosynthesisProblema 5
Capitolo 10, Problema 5

Which of the following does not occur during the Calvin cycle?
a. Carbon fixation
b. Oxidation of NADPH
c. Release of oxygen
d. Regeneration of the CO2 acceptor

Guida verificata passo dopo passo
1
Understand the Calvin cycle: The Calvin cycle is a series of biochemical reactions that take place in the stroma of chloroplasts in photosynthetic organisms. It is also known as the light-independent reactions or dark reactions.
Identify the main phases of the Calvin cycle: The Calvin cycle consists of three main phases: carbon fixation, reduction phase, and regeneration of the CO2 acceptor (ribulose bisphosphate, RuBP).
Analyze each option: a) Carbon fixation involves the incorporation of CO2 into organic molecules. b) Oxidation of NADPH is part of the reduction phase where NADPH donates electrons. c) Release of oxygen is not part of the Calvin cycle; it occurs during the light-dependent reactions. d) Regeneration of the CO2 acceptor involves the conversion of G3P back into RuBP.
Determine which process is not part of the Calvin cycle: Compare each option with the phases of the Calvin cycle to identify the one that does not occur.
Conclude that the release of oxygen is not part of the Calvin cycle, as it is associated with the light-dependent reactions of photosynthesis, not the Calvin cycle itself.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
1m

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Calvin Cycle

The Calvin Cycle is a series of biochemical reactions that occur in the stroma of chloroplasts in photosynthetic organisms. It is part of the light-independent reactions of photosynthesis, where carbon dioxide is fixed into glucose using ATP and NADPH produced in the light-dependent reactions. The cycle includes carbon fixation, reduction phase, carbohydrate formation, and regeneration of the CO2 acceptor.
Video consigliato:
03:42
Calvin Cycle

Carbon Fixation

Carbon fixation is the process of converting inorganic CO2 into organic compounds during photosynthesis. In the Calvin Cycle, CO2 is fixed by the enzyme RuBisCO, forming 3-phosphoglycerate. This step is crucial for synthesizing glucose and other carbohydrates, providing energy and structural components for the plant.
Video consigliato:
04:19
Carbon

Oxidation of NADPH

NADPH is a reducing agent used in the Calvin Cycle to convert 3-phosphoglycerate into glyceraldehyde-3-phosphate. The oxidation of NADPH involves transferring electrons to intermediates in the cycle, facilitating the reduction phase. This process is essential for synthesizing carbohydrates but does not involve the release of oxygen, which occurs in the light-dependent reactions.
Video consigliato:
04:38
Pyruvate Oxidation
Pratica correlata
Domanda del libro di testo

Which of the following sequences correctly represents the flow of electrons during photosynthesis?

a. NADPH → O2 → CO2

b. H2O → NADPH → Calvin cycle

c. H2O → photosystem I → photosystem II

d. NADPH → electron transport chain → O2

2854
views
Domanda del libro di testo

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.

2748
views
Domanda del libro di testo

Which of the following statements is a correct distinction between autotrophs and heterotrophs?

a. Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.

b. Only heterotrophs require chemical compounds from the environment.

c. Cellular respiration is unique to heterotrophs.

d. Only heterotrophs have mitochondria.

1349
views
Domanda del libro di testo

In mechanism, photophosphorylation is most similar to

a. Substrate-level phosphorylation in glycolysis.

b. Oxidative phosphorylation in cellular respiration.

c. Carbon fixation.

d. Reduction of NADP+.

1920
views
Domanda del libro di testo

Which process is most directly driven by light energy?

a. Creation of a pH gradient by pumping protons across the thylakoid membrane

b. Reduction of NADP+ molecules

c. Transfer of energy from pigment molecule to pigment molecule

d. ATP synthesis

3963
views