Question

In glycolysis and the TCA cycle, glucose is _____ down to CO2; this process _____ lots of ATP and reducing power. In photosynthesis, CO2 is ______ back to sugar by the _______ of lots of ATP and reducing power.

A) reduced; requires; oxidized; production
B) oxidized; requires; reduced; production
C) oxidized; produces; reduced; input
D) reduced; produced; oxidized; input

Answer 1

C) oxidized; produces; reduced; input

Step-by-step explanation:

Glycolysis and TCA cycle are the first two stages of cellular respiration. Glycolysis breaks down glucose into pyruvate which then enters the TCA cycle in the form of acetyl CoA and is completely oxidized into CO2 and H2O.

Both glycolysis and the TCA cycle produce a few ATPs and a large number of reducing powers (NADH and FADH2). The oxidation of reducing powers during oxidative phosphorylation drives the synthesis of a large number of ATP.

Photosynthesis is the process wherein CO2 is reduced into glucose. The process includes light-dependent synthesis of ATP and NADPH which in turn are used during the Calvin cycle to produce glucose from CO2.