Question

practice it!
select the correct statement(s) about the calvin cycle.
atp and nadph from the light reactions converts a molecule of pga into pgal.
materials are recycled to continue the cycle over and over.
glucose is formed.
the calvin cycle occurs in the thylakoid of the leaf.
one carbon atom from co, is added to a 5 - carbon sugar.

Explanation:

• In the Calvin cycle, ATP and NADPH from the light reactions are used to convert PGA (3 - phosphoglyceric acid) into PGAL (glyceraldehyde - 3 - phosphate).
• Materials like RuBP (ribulose bisphosphate) are recycled. For example, after CO₂ fixation and subsequent reactions, RuBP is regenerated to continue the cycle.
• Glucose (or other sugars) is formed from PGAL. PGAL molecules can combine and undergo further reactions to synthesize glucose.
• The Calvin cycle occurs in the stroma of the chloroplast, not in the thylakoid. The thylakoid is the site of the light reactions.
• In the first step of the Calvin cycle (carbon fixation), one carbon atom from CO₂ is added to a 5 - carbon sugar (RuBP) to form a 6 - carbon intermediate which then splits into two 3 - carbon molecules (PGA).

Answer:

A. ATP and NADPH from the light reactions converts a molecule of PGA into PGAL.
B. Materials are recycled to continue the cycle over and over.
C. Glucose is formed.
E. One carbon atom from \(CO_{2}\) is added to a 5 - carbon sugar.