Question

The Calvin cycle and the Krebs cycle are cycles of chemical reactions because they

a. occur inside organelles.
b. start over continually.
c. are part of the carbon cycle.
d. allow energy to flow in ecosystems.

Answer 1

The Calvin cycle and the Krebs cycle are cycles of chemical reactions because they start over continually. The correct option among all the options that are given in the question is the second option or option "b". I hope that the answer has actually come to your great help.

Answer 2

Answer: The correct answer is option (b).

Step-by-step explanation:

A cycle in science is defined as process or phenomena which reoccurs again after a certain interval of a time.

In a set of chemical reactions where reactant is regenerated as a product in the end. This regenerated reactant will again establish the same set of chemical reactions in a same the fashion continuously.

Krebs cycle: it is cycle which occurs during in cellular respiration which starts from acetyl-Co-A enzyme. In the end of cycle energy is released with regeneration of acetyl-Co-A enzyme which will further continue the cycle.

Calvin cycle: It is cycle which occurs in chloroplast during the process of photosynthesis which starts from carbon-dioxide. In the end sugar molecule is released with regeneration of carbon-dioxide molecule which will further continue the cycle.

Hence, Krebs cycle and Calvin cycle both are cycles of chemical reaction in which start over continually.