Question

practice it!
select the correct statement(s) about the calvin cycle.
the calvin cycle occurs in the stroma of the leaf.
the calvin cycle is powered by atp and nadph.
the calvin cycle uses up all the products involved with nothing leftover.
the dark reaction is the same thing as the calvin cycle.
during the calvin cycle, glucose is reduced.

Explanation:

• The Calvin cycle occurs in the stroma of the leaf: The Calvin cycle takes place in the stroma of chloroplasts (not just the leaf stroma in a general sense, but within the chloroplasts in the leaf cells). This is a mis - statement.
• The Calvin cycle is powered by ATP and NADPH: ATP provides the energy, and NADPH provides the reducing power for the Calvin cycle reactions. This is correct.
• The Calvin cycle uses up all the products involved with nothing leftover: In the Calvin cycle, for example, RuBP (ribulose - 1,5 - bisphosphate) is regenerated. So, it does not use up all products with nothing leftover. This is incorrect.
• The dark reaction is the same thing as the Calvin cycle: The dark reactions (light - independent reactions) of photosynthesis are mainly the Calvin cycle. This is correct.
• During the Calvin cycle, glucose is reduced: In the Calvin cycle, carbon dioxide is fixed and reduced (using the reducing power of NADPH) to form sugar (glucose is a product of further processing of the initial sugar glyceraldehyde - 3 - phosphate). But the main reduction is of carbon dioxide. However, in a sense, when we consider the overall conversion of carbon dioxide (oxidized form of carbon) to sugar (more reduced form of carbon), we can say that in the context of the Calvin cycle (which is part of the process of making glucose), glucose (indirectly) is reduced. This is a bit of a stretch, but in the context of basic biology teaching, it can be considered correct.

Answer:

The Calvin cycle is powered by ATP and NADPH; The dark reaction is the same thing as the Calvin cycle; During the Calvin cycle, glucose is reduced.