Respiration in Plants Test

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Respiration in Plants Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Removal of hydrogen and CO$$_2$$ from a substrate is called

A
Decarboxylation

B
Oxidation

C
Oxidative decarboxylation

D
Reductive decarboxylation

Solution

Oxidative decarboxylation reactions involve oxidation process which means removal of hydrogen followed by removal of carboxylate group with the formation of carbon dioxide. For example in citric acid cycle, isocitrate gives off a pair of hydrogen atoms (oxidation) and a molecule of carbon dioxide (decarboxylation and becomes) 5-carbon α-ketoglutarate. The pair of hydrogen atoms give two electrons and one H+ to NAD+ forming NADH + H+. The enzyme isocitrate dehydrogenase catalyses the reaction in the presence of manganese ions.
Thus, the correct answer is option C.
Question 2
1 / -0

End product of fermentation of sugars is

A
Water and carbon dioxide

B
Alcohol and carbon dioxide

C
Carbon dioxide

D
Alcohol

Solution

Fermentation is a type of anaerobic respiration in which the glucose is broken down into pyruvic acid in the absence of oxygen. During fermentation of sugars, this pyruvic acids coverts to a 2C acetaldehyde and then to ethanol and CO₂. All this takes place in the cytoplasm.
So, the correct option is 'Alcohol and carbon dioxide'
Question 3
1 / -0

When one glucose molecule is completely oxidised, it changes

A
36 ADP molecules into 36 ATP molecules

B
38 ADP molecules into 38 ATP molecules

C
30 ADP molecules into 30 ATP molecules

D
32 ADP molecules into 32 ATP molecules
Solution
- Aerobic respiration involves Glycolysis, Krebs' cycle and ETS.
- 1 molecule of glucose (6 C) forms 2 molecules of pyruvic acid (3 C) as end product of glycolysis. In the process, 2 molecules of NAD+ are reduced to NADH+H+ and 2 ATP is produced. So a total of 8 ATP is produced.
- 2 molecules of pyruvic acid forms 2 molecules of acetyl CoA by the link reaction. Another 2 molecules of NADH2 is produced in that reaction which releases 6 ATP through ETS.
- 2 molecules of acetyl CoA produce 24 ATP ( 6 NADH2, 2 FADH2 and 2 GTP) as it completes one cycle of Krebs' cycle.
- So a total of 38 ATP is produced from 1 molecule of glucose.
- So the answer is '38 ADP molecules into 38 ATP molecules'.
Question 4
1 / -0

Enzymes of citric acid cycle or Kreb's cycle occur in

A
Outer mitochondrial membrane

B
Inner mitochondrial membrane

C
Inter membrane space

D
Mitochondrial matrix

Solution

The citric acid cycle is also known as Kreb's cycle or tricarboxylic acid cycle is a series of enzyme-catalyzed reactions that occur in the mitochondrial matrix. It consists of 8 cyclic steps each of which is catalyzed by the specific enzyme. In Krebs cycle, the entrant molecule is 2-carbon acetyl coenzyme A and receptor molecule is 4-carbon oxaloacetic acid. All the enzymes of Krebs cycle are soluble proteins which are located in the mitochondrial matrix space except succinate dehydrogenase which is an integral membrane protein that is firmly attached to the inner surface of the inner mitochondrial membrane where it communicates directly with components in the respiratory chain.
Thus, the correct answer is option D.
Question 5
1 / -0

In Krebs cycle, malate hands over hydrogen to

A
NAD$$^+$$

B
FAD

C
FMN

D
Oxaloacetate

Solution

The last step of Krebs cycle is a dehydrogenation reaction which restores oxaloacetic acid by removing a pair of hydrogen atoms from malate with the help of an enzyme malate dehydrogenase. The pair of hydrogen atoms pass two electrons and one proton to NAD+, forming NADH + H+.
Thus, the correct answer is option A.
Question 6
1 / -0

Enzyme helping in oxidative decarboxylation of pyruvic acid is

A
Pyruvate kinase

B
Pyruvic dehydrogenase

C
Malate dehydrogenase

D
Succinic dehydrogenase

Solution

Pyruvic acid is the end product of glycolysis which enters Krebs' cycle by going through a link reaction using pyruvate dehydrogenase complex. The enzyme pyruvic dehydrogenase removes CO2 and hydrogen molecule from pyruvic acid which is called oxidative decarboxylation. This forms a 2C compound acetyl CoA which can enter Krebs' cycle.
So the answer is 'Pyruvic dehydrogenase'.
Question 7
1 / -0

In aerobic respiration, first $$CO_2$$ is liberated during

A
Oxidation of pyruvate

B
Decarboxylation of oxalosuccinate

C
Decarboxylation of $$\alpha$$-ketoglutarate

D
Alcoholic fermentation

Solution

The pyruvic acid generated in the glycolysis enters into the mitochondrial matrix, undergoes oxidative decarboxylation and forms active acetate in a coordinated series of reactions catalyzed by the multienzyme complex. The reaction requires the participation of an enzyme pyruvate dehydrogenase and several coenzymes including NAD+, coenzyme A, thiamine pyrophosphate and lipoic acid. The above reaction involves the conversion of pyruvic acid to acetyl coenzyme A followed by the release of the first molecule of carbon dioxide.
Thus, the correct answer is option A.
Question 8
1 / -0

In glycolytic pathway which of the following shows reduction of coenzyme __________________.

A
3-diphosphoglycerate to 3-phosphoglycerate

B
Glucose 6-phosphate to fructose 6-phosphate

C
3-phosphoglycerate to 2-phosphoglycerate

D
Glyceraldehyde 3-phosphate to 1-3, diphosphoglycerate
Question 9
1 / -0

Before combining with OAA, pyruvic acid is changed into

A
Succinic acid

B
Malic acid

C
Acetyl CoA

D
Citric acid

Solution

A reaction that connects the glycolysis and Krebs' cycle is the link reaction in which pyruvic acid undergoes oxidative decarboxylation through the pyruvate dehydrogenase complex and forms acetyl CoA. Acetyl CoA can now enter Krebs' cycle by combining with OAA.
So the answer is 'Acetyl CoA'.
Question 10
1 / -0

Ethanol is formed from acetaldehyde by an enzyme called

A
Lactate dehydrogenase

B
Pyruvate kinase

C
Alcohol dehydrogenase

D
Pyruvate decarboxylase

Solution

Alcoholic fermentation occurs in the absence of O2 and is a type of anaerobic respiration in which the end products are CO2 and alcohol. Aldehyde is an intermediate product in fermentation and is further oxidised to alcohol with the help of an enzyme called dehydrogenase. So ethanol is formed from acetaldehyde with the help of alcohol dehydrogenase.
Hence the answer is 'Alcohol dehydrogenase'.

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Respiration in Plants Test - 13

Result

Respiration in Plants Test - 13

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SHARING IS CARING

Question 1

Decarboxylation

Oxidation

Oxidative decarboxylation

Reductive decarboxylation

Solution

Question 2

Water and carbon dioxide

Alcohol and carbon dioxide

Carbon dioxide

Alcohol

Solution

Question 3

36 ADP molecules into 36 ATP molecules

38 ADP molecules into 38 ATP molecules

30 ADP molecules into 30 ATP molecules

32 ADP molecules into 32 ATP molecules

Solution

Question 4

Outer mitochondrial membrane

Inner mitochondrial membrane

Inter membrane space

Mitochondrial matrix

Solution

Question 5

NAD$$^+$$

FAD

FMN

Oxaloacetate

Solution

Question 6

Pyruvate kinase

Pyruvic dehydrogenase

Malate dehydrogenase

Succinic dehydrogenase

Solution

Question 7

Oxidation of pyruvate

Decarboxylation of oxalosuccinate

Decarboxylation of $$\alpha$$-ketoglutarate

Alcoholic fermentation

Solution

Question 8

3-diphosphoglycerate to 3-phosphoglycerate

Glucose 6-phosphate to fructose 6-phosphate

3-phosphoglycerate to 2-phosphoglycerate

Glyceraldehyde 3-phosphate to 1-3, diphosphoglycerate

Question 9

Succinic acid

Malic acid

Acetyl CoA

Citric acid

Solution

Question 10

Lactate dehydrogenase

Pyruvate kinase

Alcohol dehydrogenase

Pyruvate decarboxylase

Solution

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