How many total carbons are involved in carbon dioxide fixation when there are 3 molecules of carbon dioxide and 3 molecules of RuBP?
A) 6
B) 12
C) 18
D) 24
E) 30

Question

Quizplus · Accepted Answer

Each molecule of RuBP has 5 carbons, so 3 molecules of RuBP have a total of 15 carbons. 3 molecules of carbon dioxide each have 1 carbon, so a total of 3 carbons. Therefore, the total carbons involved in carbon dioxide fixation is 15 + 3 = 18. So, the answer is C, 18.

How Many Total Carbons Are Involved in Carbon Dioxide Fixation