Calvin cycle?

Question

Which of the following organic molecules CANNOT be produced by Calvin cycle products?

a) carbohydrates.

b) lipids.

c) proteins.

d) All of the above can be produced by Calvin cycle products.

e) None of the above can be produced by Calvin cycle products.

i know carbohydrates CAN be formed (duhh), but can lipids or proteins form from the products of the Calvin cycle?

Answer 1

b)

Lipids surely can't be products of the Calvin cycle.

Answer 2

PGAL the 3 carbon product of photosynthesis can give rise to all of the plants products - so the answer is d).

PGAL can give rise to glycerol  - a component of lipids.

PGAL can feed into glycolysis and hence the Kreb's Cycle leading to transamination and amino acid synthesis.

Answer 3

Option D is correct. Lipids and proteins are made from intermediates of carbohydrate metabolism. Glucose (a carbohydrate) is produced during the calvin cycle.

In plants lipids are produced starting from acetyl coenzyme A which is also a carbohydrate metabolism intermediate.