Question

In photosynthesis, NADPH is used for the A) reduction of O2 to water. B) synthesis of ATP. C) regeneration phase of the Calvin cycle. D) formation of 3-phosphoglycerate (3PG). E) reduction of 3-phosphoglycerate (3PG).

Answer 1

In photosynthesis, NADPH is used in the Calvin cycle for the reduction of 3-phosphoglycerate (3PG) to glyceraldehyde 3-phosphate (G3P), making E) the reduction of 3-phosphoglycerate (3PG) the correct answer.

Step-by-step explanation:

In photosynthesis, NADPH is utilized in the Calvin cycle, specifically during the reduction phase. The role of NADPH is crucial in the process of converting 3-phosphoglycerate (3-PGA) into glyceraldehyde 3-phosphate (G3P). This transformation is a reduction reaction, where 3-PGA gains electrons and hydrogens, facilitated by the energy and hydrogen atom from NADPH, turning NADPH into its oxidized form, NADP+.

To elaborate, six molecules of 3-PGA are reduced to six molecules of G3P using the energy and reducing power of six molecules of NADPH, alongside ATP. In this process, NADPH contributes its electrons and becomes oxidized, while ATP is converted to ADP and inorganic phosphate, releasing energy. After the reduction reaction, the resulting ADP and NADP+ return to the light-dependent reactions to be recharged.

Therefore, the correct answer to the question is E) the reduction of 3-phosphoglycerate (3PG).

Answer 2

NADPH is used to regeneration phase of the Calvin cycle. LETTER C

Step-by-step explanation:

NADPH is an energy carrying molecule produced in the first stage of photosynthesis. It provides energy to fuel the Calvin cycle in the second stage of photosynthesis.

The nicotinamide adenine dinucleotide phosphate hydrogen is crucial for most of the chemical reactions that take place during the photosynthesis process.