The stage of cellular respiration that directly involves oxygen is:

1.	glycolysis
2.	at the end of ETC
3.	Krebs cycle
4.	the phosphorylation of ADP to form ATP

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

What process in aerobic respiration generates maximum ATP?

Consider the steps of glycolysis given in the diagram:

Regarding reaction 2 in the diagram:

1. Only I is true
2. Only II is true
3. Both I and II are true
4. Both I and II are false

Consider the steps of glycolysis given in the diagram:
  
Regarding reaction 3 in the diagram:

1. Only I is true
2. Only II is true
3. Both I and II are true
4. Both I and II are false

In aerobic respiration, oxygen acts as:

${\mathrm{FADH}}_2$ is produced in

NADH is produced during
I. glycolysis
II. the oxidation of pyruvate
III. the Krebs cycle

Consider the steps of glycolysis given in the diagram:

It is advantageous that in reaction 5 DHAP is isomerized to G3P because:
1. G3P has more energy than DHAP
2. DHAP is highly toxic
3. Regulation of the pathway becomes easy
4. DHAP is unstable and breaks down to Acetyl CoA