AP® Biology

Free Version

Upgrade subject to access all content

Difficult

Absence of Oxygen

APBIO-4VEXTH

In the absence of oxygen, plants will break down sugars into carbon dioxide and alcohols or acids.

Which of the following BEST explains how this pathway likely arose?

A

To get the most out phosphorylation per molecule of pyruvate without the ability to utilize respiration.

B

As an alternative process to compete with respiration.

C

To regenerate depleted NAD$^+$.

D

Because of human cultivation.