In the Initial Step in Carbon Fixation, a Molecule of CO₂

question 14

Multiple Choice

In the initial step in carbon fixation, a molecule of CO₂ is attached to RuBP to produce a six-carbon molecule, which is immediately split to produce two molecules of 3-phosphoglycerate. After phosphorylation and reduction produces glyceraldehyde 3-phosphate (G3P) , what more needs to occur to complete the Calvin cycle?

• A) addition of a pair of electrons from NADPH
• B) regeneration of ATP from ADP
• C) regeneration of RuBP
• D) regeneration of NADP⁺

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Definitions:

Limbic System

A complex system of nerves and networks in the brain, involving several areas near the edge of the cortex concerned with instinct and mood. It controls the basic emotions (fear, pleasure, anger) and drives (hunger, sex, dominance, care of offspring).

Cerebellum

The part of the brain located at the back of the skull, beneath the occipital lobes, involved in regulating motor movements, maintaining posture and balance, and possibly cognitive functions.

Cerebral Cortex

The outer layer of neural tissue of the cerebrum of the brain, playing a key role in memory, attention, perception, cognition, awareness, thought, language, and consciousness.

Cerebrum

The largest structure of the human brain, consisting of the two cerebral hemispheres connected by the corpus callosum and covered by the cerebral cortex.