Question

multiple choice question
the assembly of new organic molecules occurs during a stage of photosynthesis called ______.

• the calvin cycle
• cellular respiration
• the light - dependent reactions
• chemiosmosis

Explanation:

• Option 1 (the Calvin cycle): The Calvin cycle is the light - independent stage of photosynthesis. In this stage, carbon dioxide is fixed and used to assemble new organic molecules (like glucose) using the energy carriers (ATP and NADPH) produced in the light - dependent reactions.
• Option 2 (cellular respiration): Cellular respiration is the process of breaking down organic molecules to release energy, which is the opposite of assembling new organic molecules. So this option is incorrect.
• Option 3 (the light - dependent reactions): The light - dependent reactions of photosynthesis are mainly focused on capturing light energy and converting it into chemical energy in the form of ATP and NADPH. They do not assemble new organic molecules. So this option is incorrect.
• Option 4 (chemiosmosis): Chemiosmosis is a process involved in the generation of ATP (in both photosynthesis and cellular respiration), but it is not the stage where new organic molecules are assembled. So this option is incorrect.

Answer:

A. the Calvin cycle