Oxidation of Pyruvate

Q. Which metabolic pathway takes place in dough that results in the formation of carbon dioxide? Where do bacteria for these fermentations come from?

Q.

Similarities and differences between aerobic and anaerobic respiration.

Q.

Connecting link between glycolysis and Krebs cycle is/before entering Krebs cycle pyruvate is changed to

1. Oxaloacetate

2. PEP

3. Pyruvate

4. Acetyl CoA

Q.

Is cellular respiration an oxidation or reduction reaction?

Q.

The number of ATPs produced in each Krebs cycle through oxidative phosphorylation is____

Q.

How many ATP are produced from NADH2 during aerobic respiration?

1. 30

2. 8

3. 2

4. 34

Q.

What happens during pyruvate decarboxylation?

Q. The number of ATP molecules produced from one molecule of pyruvic acid during the conversion to acetyl CoA is

1. 3
2. 6
3. 12
4. 15

Q.

Where does oxidative decarboxylation occur?

Q.

The end product of Krebs cycle is

1. Malic acid

2. Lactic acid

3. Pyruvic acid

4. Citric acid

Q. When fats are to be respired they get broken to simple oxidisable forms - fatty acids and glycerol where they enter the respiratory pathway through various __. Fatty acid gets converted to acetyl-CoA and glycerol to PGAL to enter Krebs cycle.

Q. Which of the following is essential for conversion of pyruvic acid into acetyl CoA?

1. lipoic acid
2. ${\mathrm{NAD}}^{+}$
3. TPP (Thiamine pyrophosphate)
4. All of these

Q. First oxidative decarboxylation in aerobic respiration occurs during the conversion of

1. $\alpha$-ketoglutaric acid to succinyl CoA
2. oxalosuccinic acid to isocitric acid
3. pyruvic acid to acetyl CoA
4. fumaric acid to malic acid

Q. Which one of the following metabolites is common to respiration mediated breakdown of fats, carbohydrates and proteins?

1. Glucose-6-phosphate
2. Pyruvic acid
3. Acetyl CoA
4. Fructose-1, 6-bisphosphate

Q.

RuBP carboxylase, PEPcase, pyruvate dehydrogenase, ATPase, cytocnrome oxidase, hexokinase, lactate dehydrogenase. Select/choose enzymes from the list above which are involved in
(a) Photosynthesis
(b) Respiration
(c) Both in photosynthesis and respiration

Q. Which one of the following reactions is an example of oxidative decarboxylation?

1. Conversion of succinate to fumarate
2. Conversion of fumarate to malate
3. Conversion of pyruvate to acetyl Co-A
4. Conversion of citrate to isocitrate

Q.

The end products of aerobic respiration:

1. Carbon dioxide and water

2. carbon dioxide and oxygen

3. Carbon dioxide and ethyl alcohol

4. Carbon dioxide and glucose

Q. According to new studies one molecule of NADH releases 2.5 ATPs and one molecule of ${\mathrm{FADH}}_2$ releases 1.5 ATPs, then the number of ATPs generated in ETC from 1 molecule of acetyl CoA is

1. 10
2. 12
3. 12.5
4. 15

Q. Oxidative decarboxylation of pyruvic acid results in the formation of
I. Acetyl Co-A
II. $C{O}_2$
III. ATP
IV. $NADH+H^{+}$
Select the correct answer using the codes given below

1. Only I
2. III and IV
3. I and II
4. I, II and III
5. I, II and IV

Q. Pyruvate dehydrogenase complex is used in converting

1. pyruvate to glucose
2. glucose to pyruvate
3. pyruvic acid to lactic acid
4. pyruvate to acetyl CoA

Q.

What happens during gluconeogenesis?

Q.

In yeast, which of the following does not occur during anaerobic respiration?

1. Formation of phosphoglyceric acid

2. Formation of acetyl CoA

3. Formation of acetaldehyde

4. Formation of ATP

Q. Link enzyme in cellular respiration which catalyzes the substrate produced during glycolysis, and funnels it into the Kreb's cycle is ______.

1. Succinyl thiokinase
2. Isocitrate dehydrogenase
3. Citrate synthetase
4. Pyruvate dehydrogenase

Q.

What role does O2 play in aerobic respiration?

1. it is given off as a by-product during the oxidation of pyruvate

2. it combines with H2O to help drive the formation of ATP

3. it is the final electron acceptor at the end of the electron transport chain

4. it combines with acetyl-CoA at the start of the Krebs cycle

Q. During cellular respiration, acetyl CoA accumulates in which location?

1. Cytosol
2. Mitochondrial matrix
3. Inner membrane of mitochondria
4. Outer membrane of mitochondria

Q. The formation of Acetyl CoA from pyruvic acid involves

1. reduction
2. dehydration
3. phosphorylation
4. oxidative decarboxylation

Q.

Which reaction is unique to gluconeogenesis?

Q. Oxidation of pyruvate to acetyl coA is catalysed by the enzyme pyruvate .

1. dehydrogenase
2. catalase
3. phosphorylase
4. esterase

Q.

Which process converts pyruvate to acetyl-CoA?

1. the preparatory reaction

2. glycolysis

3. fermentation

4. the electron transport system

Q. Pyruvic dehydrogenase complex needed for the conversion of pyruvic acid to acetyl CoA is located in

1. Matrix of mitochondria
2. Intermembrane space of mitochondria
3. Grana of chloroplast
4. Cytoplasm