A reducing agent in a redox reaction:
1. gains electrons and gains energy.
2. loses electrons and loses energy.
3. gains electrons and loses energy.
4. loses electrons and gains energy.

What is the end product of glycolysis?

The outputs of the Krebs cycle do not include:

Oxidation of organic compounds by molecular oxygen results in the production of carbon dioxide and water and releases free energy. This is because:

1.High energy covalent bonds in organic molecules are broken to produce weaker covalent bonds in water and carbon dioxide.

2. Electrons are being moved from atoms that have a lower affinity for electrons to atoms with a higher affinity for electrons.

3.The electrons in water and carbon dioxide have higher potential energy than the electrons in organic compounds.

4. The covalent bonds in organic molecules are unstable and stable in water and oxygen.

In the given reaction:
${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6\to 6{\mathrm{CO}}_2+6{\mathrm{H}}_2\mathrm{O}+\mathrm{Energy}$
1. ${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6$ is oxidized and ${\mathrm{O}}_2$ is reduced.
2. ${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6$ is reduced and ${\mathrm{O}}_2$ is oxidized.
3. ${\mathrm{CO}}_2$ is reduced and ${\mathrm{O}}_2$ is oxidized.
4. ${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6$ is reduced and ${\mathrm{CO}}_2$ is oxidized.

The products of fermentation do not include:

Oxidative decarboxylation of pyruvate produces:

The stage of cellular respiration that directly involves oxygen is:

When an electron is shifted to a more electronegative atom, its potential energy:

Consider the steps of glycolysis given in the diagram:  

What is true about reaction 1?
I. Hexokinase is a transferase
II. It acts to keep the glucose concentration low
III. It blocks the glucose from leaking out
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III