Question

multiple choice question each turn of the calvin cycle adds how many carbon atoms from carbon dioxide? three two six one

Explanation:

The Calvin cycle is a part of photosynthesis. In each turn of the Calvin cycle, one molecule of carbon dioxide ($CO_2$) is fixed, and each $CO_2$ molecule has one carbon atom. So each turn adds one carbon atom from carbon dioxide.

Answer:

D. one (assuming the options are labeled as A. three, B. two, C. six, D. one)