Respiration in Plants Test

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Respiration in Plants Test - 57

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Weekly Quiz Competition

Question 1
1 / -0

How many NADH is formed during glycolysis?

A
1

B
3

C
2

D
5

Solution

Glycolysis is a metabolic process in which one glucose molecule is converted into 2 puruvate molecules under aerobic condition. The end products of glycolysis are 4 ATP molecules, out of which 2 ATP molecules are utilized, 2 pyruvic acid molecules and 2 NADH molecules.
Thus, the correct answer is '2.'
Question 2
1 / -0

Pyruvic acid is a product of

A
Acetyl

B
CoA

C
Starch

D
Glucose

Solution

Pyruvic acid is a 3 carbon compound formed as the end product of glycolysis. Glycolysis starts with glucose as a respiratory substrate. So pyruvic acid forms from glucose.
So, the correct answer is 'Glucose'.
Question 3
1 / -0

What is produced when succinyl CoA is changed to succinate?

A
ATP

B
GTP

C
CTP

D
ATP in plants and GTP in animals

Solution

Krebs' cycle is a cyclic catabolic process in which the end product is reused to start the cycle again for producing energy. Succinyl CoA converts to succinic acid in presence of succinic thiokinase. 1 ATP or 1 GTP is produced in plants or animals respectively during this conversion.
So, the answer is 'ATP in plants and GTP in animals'.
Question 4
1 / -0

Fructose 6-phosphate is changed to fructose 1,6-diphosphate by

A
Phosphoglycerate

B
Phosphatase

C
Phosphofructokinase

D
Enolase

Solution

One of the steps in cellular respiration is glycolysis which oxidises glucose to pyruvic acid. After fructose-6-phosphate is formed in glycolysis, it is converted to fructose -1,6- biphosphate in presence of phosphofructo-kinase. It is a phosphorylation reaction which uses up 1 ATP.
So, the correct answer is 'Phosphofructokinase'.
Question 5
1 / -0

Which one is absent in erythrocytes?

A
Krebs cycle

B
Enzymes

C
Biomembrane

D
Hyaloplasm

Solution

Erythrocytes as they mature lose a number of organelles including mitochondria. As Krebs' cycle occurs in mitochondria, it is absent in erythrocytes. RBCs predominantly use HMP for respiration.
So, the correct answer is 'Krebs' cycle'.
Question 6
1 / -0

Cofactor required for formation of acetyl CoA is _____________.

A
TPP

B
Lipoic acid

C
$$Mg^{2+}$$, CoA

D
All the above
Question 7
1 / -0

Number of ATP produced from one pyruvic acid during conversion to acetyl CoA is

A
3

B
5

C
8

D
15

Solution

Pyruvic acid, the end product of glycolysis requires to undergo a link reaction to be able to enter Krebs' cycle as acetyl CoA, a 2 carbon compound. Pyruvic acid is acetylated by the pyruvate dehydrogenase complex which releases hydrogen and carbon dioxide. Hydrogen reduces one NAD+ to NADH2 per molecule of pyruvic acid. 1 NADH2 yields 3 ATP from ETS.
So, the correct answer is '3'.
Question 8
1 / -0

Ketoglutarate dehydrogenase brings about

A
Oxidation and decarboxylation

B
Oxidation

C
Decarboxylation

D
Reduction

Solution

Ketoglutarate dehydrogenase is an essential enzyme that converts α ketoglutaric acid to succinyl CoA in Krebs' cycle. Such a conversion oxidises the ketoglutaric acid of hydrogen and also removes one CO$$_2$$. Hence it is a oxidation and decarboxylation reaction. So the answer is 'Oxidation and decarboxylation'.
Question 9
1 / -0

Fermentation produces

A
Protein and acetic acid

B
Alcohol and lipoprotein

C
Alcohol and lactic acid

D
Ethers and acetones

Solution

Fermentation is a type of anaerobic respiration that occurs in both plants and animals in the absence of oxygen. The end product is ethyl alcohol in plants and lactic acid in animal cells along with release of CO$$_2$$ and energy. Fermentation is not as much energy yielding as aerobic respiration.
So the answer is 'Alcohol and lactic acid'.
Question 10
1 / -0

Conversion of sugar into alcohol during fermentation is due to direct action of

A
Temperature

B
Concentration of sugar

C
Zymase

D
Microorganisms

Solution

Conversion of sugar to alcohol directly was found in yeast fermentation in which glucose was converted to ethyl alcohol and CO$$_2$$. The conversion happens in presence of an enzyme called zymase which is found naturally in yeast. So, the answer is 'Zymase'.

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Respiration in Plants Test - 57

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Respiration in Plants Test - 57

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SHARING IS CARING

Question 1

1

3

2

5

Solution

Question 2

Acetyl

CoA

Starch

Glucose

Solution

Question 3

ATP

GTP

CTP

ATP in plants and GTP in animals

Solution

Question 4

Phosphoglycerate

Phosphatase

Phosphofructokinase

Enolase

Solution

Question 5

Krebs cycle

Enzymes

Biomembrane

Hyaloplasm

Solution

Question 6

TPP

Lipoic acid

$$Mg^{2+}$$, CoA

All the above

Question 7

3

5

8

15

Solution

Question 8

Oxidation and decarboxylation

Oxidation

Decarboxylation

Reduction

Solution

Question 9

Protein and acetic acid

Alcohol and lipoprotein

Alcohol and lactic acid

Ethers and acetones

Solution

Question 10

Temperature

Concentration of sugar

Zymase

Microorganisms

Solution

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