In aerobic respiration, oxygen acts as:

I:	Terminal electron acceptor
II:	Terminal proton acceptor

 

1.	Only I	2.	Only II
3.	Both I and II	4.	Neither I nor II

${\mathrm{FADH}}_2$ 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

What percentage of ATP formed in a glycolytic pathway is formed by substrate-level phosphorylation?

By the end of glycolysis, most of the original energy in the glucose molecule is:
1. utilized to form ATP.
2. retained in the pyruvate.
3. stored in the NADH produced.
4. lost as heat.

Krebs cycle is also called as:

Only two molecules of NADH are formed during glycolysis because:
1.The amount of energy in glucose is sufficient only to make two NADH.
2.Most of the energy of glucose is diverted to ATP during Glycolysis.
3. Most of the free energy available from the oxidation of glucose remains in pyruvate.
4.The availability of NAD+ is enough to make only two NADH.

The ʺnetʺ products of glycolysis are:
1. $2{\mathrm{NAD}}^{+}$, $2{\mathrm{H}}^{+}$, 2 pyruvate, 2 ATP, and $2{\mathrm{H}}_2\mathrm{O}$.
2. $6{\mathrm{CO}}_2$, $6{\mathrm{H}}_2\mathrm{O}$, 2 ATP, and 2 pyruvate
3. $2{\mathrm{FADH}}_2$, 2 pyruvate, 4 ATP, and $2{\mathrm{H}}_2\mathrm{O}$.
4.2 NADH, $2{\mathrm{H}}^{+}$, 2 pyruvate, 2 ATP, and $2{\mathrm{H}}_2\mathrm{O}$.

Glycolysis will be most adversely affected by a toxin:
1. that reacts with oxygen and reduces its availability
2. that binds to pyruvate and inactivates it
3. that closely mimics the structure of glucose but is not metabolized
4. that regenerates ${\mathrm{NAD}}^{+}$ from NADH