Balance Sheet of Krebs Cycle

Q.

What is Cori cycle?

Q.

Do both C₃ and C₄ have PEP cases?

Q.

Name the essential elements that activate or inhibit enzymes?

Q. How many molecules of reduced coenzymes are produced inside mitochondria during complete oxidation of one glucose?

1. Twelve -10 NADH + 2 ${\mathrm{FADH}}_2$
2. Five - 4NADH + 1 ${\mathrm{FADH}}_2$
3. Ten -8 NADH + 2 ${\mathrm{FADH}}_2$
4. Four -3 NADH + 1 ${\mathrm{FADH}}_2$

Q. Single "turn" of the Krebs cycle will yield

1. 1 ATP, 2 NADH and 1 FADH${}_2$
2. 1 ATP, 2 NADH and 2 FADH${}_2$
3. 1 ATP, 3 NADH and 1 FADH${}_2$
4. 2 ATP, 2 NADH and 2 FADH${}_2$

Q. In which of the following reaction of glycolysis, a molecule of water is removed from the substrate?

1. Frucoste-6-phosphate → Fructose 1, 6-phosphate
2. 3-phosphate glyceraldehyde → 1, 3-biphosphoglyceric acid
3. PEP → Pyruvic acid
4. 2-phosphoglycerate → PEP

Q.

What is mixed-function oxidase?

Q.

Match the classes of enzymes listed in column I with the subdivisions given in column II and select the right answer showing the correct combination of alphabets of the two columns.

$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ & \text{Class of enzymens}& & \text{Subdivisions}\\ A& \text{Oxidoreductases}& e& \text{Decarboxylases}\\ B& \text{Transferases}& f& \text{Acetyl COA carboxylase}\\ C& \text{Hydrolases}& g& \text{Dehydrogenases}\\ D& \text{Ligases}& h& \text{Kinases}\\ & & i& \text{Proteases}\end{array}$

1. A = e, B = f, C = g, D = h

2. A = g, B = h, C = I, D = f

3. A = I, B = g, C = h, D = e

4. A = g, B = e, C = i, D = f

Q.

What is the function of PEP carboxylase?

Q. Both ATP and NADPH are utilized in the __ phase of calvin cycle

Q. What is true of Krebs cycle

1. Acetyl CoA combines with OAA.
2. Two decarboxylations
3. ATP/GTP is formed
4. All the above.
   
   

Q. Which of the following is true for sickle cell anaemia?

1. Substitution of glutamic acid by valine at the sixth position of the beta globin chain
2. Substitution of valine by glutamic acid at the sixth position of the beta globin chain
3. Substitution of valine by glutamic acid at the fifth position of the beta globin chain
4. Substitution of glutamic acid by valine at the fifth position of the beta globin chain

Q.

What are different classes of enzymes ? Explain any two with the type of reactions they catalyse.

Q. Complete oxidation of one molecule of glucose requires

1. 3 turns of Kreb’s cycle
2. 2 turns of Kreb’s cycle
3. 5 turns of Kreb’s cycle
4. 1 turn of Kreb’s cycle

Q.

Which pathway will result in the production of four carbon dioxide molecules, two ATP molecules, NADH2 and FADH2?

1. Krebs cycle

2. Calvin cycle

3. glycolysis

4. transition reaction

Q. __________ is not produced during respiration.

1. ATP
2. NADPH
3. $NADH+H^{+}$
4. $FAD{H}_2$

Q. Enzyme pair common to both EMP and $C_3$ cycle is

1. Aldolase and enolase
2. Aldolase and triose phosphate isomerase
3. Cytochrome oxidase and enolase.
4. Phosphoglycero mutase and triose phosphate isomerase

Q.

1. ${2NADH}_2+{2FADH}_2+1GTP$
2. ${3NADH}_2+{2FADH}_2+2GTP$
3. ${6NADH}_2+{2FADH}_2+2GTP$
4. ${3NADH}_2+{1FADH}_2+4GTP$

Q. Ketone bodies are formed in.

1. Liver
2. Spleen
3. Kidney
4. Heart

Q. Match List I(compound oxidized during Krebs cycle) with List II(Compound formed on oxidation) and select the correct answer.

List-I	List-II
a. Pyruvic acid	$1$. AcetylCoA
b. Isocitric acid	$2$. Succinyl CoA
c. a-Ketoglutaric acid	$3$. Oxaloacetic acid
d. Succinic acid	$4$. Oxalosuccinic acid
	$5$. Fumaric acid

1. A-$1$, B-$4$, C-$3$, D-$2$
2. A-$2$, B-$1$, C-$3$, D-$4$
3. A-$3$, B-$1$, C-$2$, D-$5$
4. A-$1$, B-$4$, C-$2$, D-$5$

Q. The number of ATP molecules produced by electron transport system from Krebs cycle intermediates in a single turn is _________.

1. 11
2. 12
3. 14
4. 16

Q. The final output of the Krebs cycle includes all of the following except

1. NADP
2. FADH2
3. ATP
4. Carbon dioxide

Q. How many molecules of reduced coenzymes are produced inside mitochondria during complete oxidation of one glucose?

1. Five - 4NADH + 1 ${\mathrm{FADH}}_2$
2. Twelve -10 NADH + 2 ${\mathrm{FADH}}_2$
3. Ten -8 NADH + 2 ${\mathrm{FADH}}_2$
4. Four -3 NADH + 1 ${\mathrm{FADH}}_2$

Q. How many molecules of $C{O}_2$ are released in citric acid cycle :-

1. One
2. Two
3. Three
4. Four

Q. In Krebs cycle, 5-carbon compound formed is

1. $\alpha$-ketoglutaric acid
2. fumaric acid
3. citric acid
4. malic acid

Q. Assertion :Photorespiration interferes with the successful functioning of Calvin cycle. Reason: Photorespiration oxidizes the pentose phosphate which is an acceptor of CO${}_2$ in Calvin cycle.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. In Krebs cycle, guanosine triphosphate is formed during the conversion of

1. Fumarate to malate
2. Isocitrate to otalosuccinate
3. Oxalosuccinate to -ketoglutarate
4. Succinyl CoA to succinate

Q. Oxalosuccinic acid, a transient intermediary compound of Kreb's cycle is _____.

1. 4-carbon compound
2. 5-carbon compound
3. 6-carbon compound
4. 3-carbon compound

Q.

1. succinic acid and pyruvic acid
2. fumaric acid and pyruvic acid
3. OAA and acetyl CoA
4. malic acid and acetyl CoA

Q. In glycolysis, glucose molecule is converted into which substance?

1. Lactic acid
2. Ethanol
3. Pyruvate
4. Amino acid