Respiration in Plants Test

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Respiration in Plants Test - 65

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Question 1
1 / -0

During EMP pathway, ATP is produced through

A
Oxidative phosphorylation

B
Cyclic phosphorylation

C
Substrate phosphorylation

D
None of the above

Solution

During the EMP pathway or glycolysis, there is a stepwise oxidation as well as dephosphorylation of organic substrate to produce energy. A net of 2 ATP are directly produced by substrate level phosphorylation.
So, the correct answer is 'Substrate phosphorylation'.
Question 2
1 / -0

Out of 38 molecules of ATP produced after aerobic respiration of glucose, the break up in ATP production in glycolysis (P). pyruvic acid to acetyl CoA formation (Q) and Krebs cycle (R) is

A
P = 2, Q = 6, R = 30

B
P = 8, Q = 6, R = 24

C
P = 8, Q = 10, R = 20

D
P = 2, Q = 12, R = 24
Question 3
1 / -0

In which one of following reactions of glycolysis, oxidation takes place

A
Glucose 6-P to fructose 6-P

B
Fructose 6-P to fructose 1, 6-biphosphate

C
1, 3-biphosphoglycerate to 3-phosphoglyceric acid

D
3-phosphoglyceraldehyde to 1, 3-biphosphoglycerate

E
2-phosphoglycerate to phosphoenolpyruvate

Solution

Oxidation of organic substrate occurs in glycolysis for the release of energy. In this, oxidation is in the form of release of hydrogen which reduces NAD to NADH2. Conversion of 3-phosphoglyceraldehyde to 1,3- biphosphoglycerate is an oxidation reaction.
So the answer is ' 3-phosphoglyceraldehyde to 1,3- biphosphoglycerate'.
Question 4
1 / -0

The inner membrane of mitochondria is permeable to

A
Glucose

B
Fructose

C
Sucrose

D
ATP
Solution
- Mitochondria is a double membrane-bound(outer membrane and inner membrane) cell organelle found in the cytoplasm of eukaryotic cells.
- Mitochondria are responsible for the conversion of nutrients into energy-yielding molecule ATP to fuel cell activities. Mitochondria is frequently referred to as powerhouse of the cell.
- The inner membrane is loaded with proteins involved in electron transport and ATP synthesis. This membrane surrounds the mitochondrial matrix, where the citric acid cycle produces the electrons that travel from one protein complex to the next in the inner membrane. Hence it is permeable to ATP.
- So, the correct answer is 'ATP'.
Question 5
1 / -0

In which of the following steps of citric acid cycle, $$CO_2$$ is evolved
I. Citric acid -ketoglutaric acid
II. Succinic acid malic acid
III. Malic acid oxaloacetic acid
IV. -Ketaglutaric acid succinyl CoA

A
I and II

B
I and IV

C
II and III

D
II and IV

E
III and IV
Question 6
1 / -0

How many glucose molecules are required for the formation of 52 pyruvic acid molecules at the end of glycolysis

A
52

B
46

C
32

D
26

Solution

1 molecule of 6-carbon glucose forms 2 molecules of 3-carbon pyruvic acids when it undergoes glycolysis. So to form 52 pyruvic acids, 26 glucose molecules are required.
So the answer is '26'.
Question 7
1 / -0

The coenzyme involved in oxidative decarboxylation is phosphate

A
Thiamine pyrophosphate

B
Biotin

C
NAD

D
Pyridoxal phosphate

Solution

The oxidative decarboxylation occurs when pyruvic acid undergoes a link reaction which connects glycolysis and Krebs' cycle. Coenzymes like thiamine pyrophosphate, lipoic acid and and FAD take part in this reaction.
So, the correct answer is 'Thiamine pyrophosphate'.
Question 8
1 / -0

In anaerobic respiration, acetaldehyde is reduced to form alcohol by utilising $$NADH_2$$ obtained from

A
Glycolysis

B
Terminal oxidation

C
Krebs cycle

D
Acetylation

Solution

Anaerobic respiration starts with the process of glycolysis. The NADH2 thus formed from glycolysis are used to further oxidise acetaldehyde to form alcohol and CO2. The NAD formed are then recycled back to be used in glycolysis.
So the answer is 'Glycolysis'.
Question 9
1 / -0

Which molecule links glycolysis with fermentation as well as TCA cycle?

A
Ethanol

B
Acetaldehyde

C
PEP

D
Pyruvic acid.

Solution

Glycolysis is the formation of pyruvic acid from glucose in a multi-step process in the presence of enzymes. Pyruvic acid acts as the common molecule which undergoes Krebs cycle in aerobic respiration and fermentation in anaerobic respiration.
So the correct option is 'Pyruvic acid'.
Question 10
1 / -0

Conversion of pyruvic acid into ethyl alcohol is facilitated by enzyme(s)

A
Carboxylase

B
Phosphatase

C
Dehydrogenase

D
Decarboxylase and dehydrogenase

Solution

When the pyruvic acid converts into alcohol in the presence of enzymes by bacteria and also exhibited by some in the lack of oxygen.
$$2CH_3COOH\rightarrow2CH_3CHO+2CO_2$$ is takes place in the presence of decarboxylase which removes carbon dioxide
$$2CH_3CHO+2 NADH_2\rightarrow2C_2H_5OH+2NAD$$ is takes place in the presence of alcohol dehydrogenase.
So the correct option is 'Decarboxylase and dehydrogenase'.

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Respiration in Plants Test - 65

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Respiration in Plants Test - 65

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SHARING IS CARING

Question 1

Oxidative phosphorylation

Cyclic phosphorylation

Substrate phosphorylation

None of the above

Solution

Question 2

P = 2, Q = 6, R = 30

P = 8, Q = 6, R = 24

P = 8, Q = 10, R = 20

P = 2, Q = 12, R = 24

Question 3

Glucose 6-P to fructose 6-P

Fructose 6-P to fructose 1, 6-biphosphate

1, 3-biphosphoglycerate to 3-phosphoglyceric acid

3-phosphoglyceraldehyde to 1, 3-biphosphoglycerate

2-phosphoglycerate to phosphoenolpyruvate

Solution

Question 4

Glucose

Fructose

Sucrose

ATP

Solution

Question 5

I and II

I and IV

II and III

II and IV

III and IV

Question 6

52

46

32

26

Solution

Question 7

Thiamine pyrophosphate

Biotin

NAD

Pyridoxal phosphate

Solution

Question 8

Glycolysis

Terminal oxidation

Krebs cycle

Acetylation

Solution

Question 9

Ethanol

Acetaldehyde

PEP

Pyruvic acid.

Solution

Question 10

Carboxylase

Phosphatase

Dehydrogenase

Decarboxylase and dehydrogenase

Solution

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