Respiration in Plants Test

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Respiration in Plants Test - 48

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Weekly Quiz Competition

Question 1
1 / -0

As a pathway, glycolysis is an example of a coupled reaction.
It is strictly an anaerobic reaction, in which the energy investment phase is dependent upon

A
The hydrolysis of ATP to ADP and $$P_i$$.

B
The presence of glucose as a substrate.

C
The presence of oxygen and its conversion to carbon dioxide.

D
The synthesis of pyruvate.

Solution

Glycolysis is an anaerobic reaction, where glucose (6C) is split into 2 molecules of pyruvic acid (3C). During this process 2 ATP molecules are hydrolyzed to convert Glucose to Fructose -1,6 bisphosphate. Here ATP is invested for the breakdown to take place.
So, the correct answer is 'The synthesis of pyruvate'
Question 2
1 / -0

Cellular respiration takes place in the mitochondria of eukaryotic cells. Which process is affected when holes are poked through the inner mitochondrial most membrane?

A
Production of pyruvate

B
Production of Acetyl-CoA

C
Production of NADH

D
Production of ATP

E
Production of lactic acid

Solution

If we poke a hole through inner mitochondrial membrane then there will be no proton gradient as the protons will just diffuse through the hole. Since proton gradient is necessary for ATP formation (as stated by chemiosmotic hypothesis), ATP production will be reduced or may be stopped completely.
So, the correct answer is 'Production of ATP'.
Question 3
1 / -0

Pyruvate undergoes oxidative decarboxylation to produce

A
2-PGA.

B
$$\alpha$$ -Ketone.

C
Succinyl Co-A.

D
Acetyl Co-A.

Solution

Pyruvate is formed as the product of glycolysis. It is converted into acetyl coenzyme A by the process of oxidative decarboxylation, which is catalysed by the pyruvate dehydrogenase enzyme. The formed acetyl coenzyme A is used in the citric acid cycle as a fuel. So, the correct option is D.
Question 4
1 / -0

TCA cycle enzymes are located in

A
Cristae of the mitochondria.

B
Outer membrane of the mitochondria.

C
Mitochondrial matrix.

D
Mitochondrial intermembrane space.

Solution

TCA stands for tricarboxylic acid, is a series of the chemical reaction which is used by all aerobic organisms in cells. This is also known as Kreb's cycle or citric acid cycle. TCA cycle enzymes are located in the mitochondrial matrix. It promotes reaction subject to the production of ATP such as the citric acid cycle, oxidative phosphorylation, oxidation of pyruvate and the beta-oxidation of fatty acids.
So, the correct answer is option C.
Question 5
1 / -0

Select a suitable name for this process.
$${C}_{6}{H}_{12}{O}_{6}+2ADP+2Pi \longrightarrow 2{C}_{2}{H}_{5}OH + 2ATP + 2C{O}_{2}\uparrow$$

A
Alcoholic fermentation

B
Photorespiration

C
Lactate fermentation

D
Aerobic respiration

Solution

Alcohol fermentation is the process in which the sugars are converted to ethanol and carbon dioxide. It is an anaerobic pathway. The sugars are broken down in the absence of oxygen. This pathway is carried out be the fungus like yeast. Sugars like the sucrose, glucose and fructose can be used for this type of reaction.
Thus, the correct answer is option A.
Question 6
1 / -0

The site of Krebs cycle is

A
Cytoplasm.

B
Mitochondrial matrix.

C
Intermembrane space of mitochondria.

D
Racker's particles.

Solution

The Krebs cycle is also known as citric acid cycle or tricarboxylic acid (TCA) cycle. This cycle involves series of reactions in which the energy is released by the break down of the molecules like carbohydrates, proteins and fats. The energy is released in the form of ATP. The reaction of this cycle is carried out in the mitochondrial matrix. The enzymes for this pathway are present in the matrix of the mitochondria.
Thus, the correct answer is option B.
Question 7
1 / -0

Which of the following metabolites enter the TCA cycle during glucose oxidation?

A
Oxaloacetic acid

B
Pyruvic acid

C
Acetyl CoA

D
Malic acid

Solution

Glycolysis is a cytosolic process and will break a molecule of glucose into two molecules of pyruvic acid. Each molecule of pyruvic acid is oxidatively decarboxylated to acetyl coA by the action of an enzyme complex pyruvate dehydrogenase. The acetyl coA then enters the Krebs (TCA) cycle. Thus, acetyl CoA forms the link between glycolysis and Krebs (TCA) cycle.
Thus, the correct answer is option C.
Question 8
1 / -0

RQ (Respiratory Quotient) is defined as

A
$$Volume \quad of \quad C{O}_{2} \quad evolved = volume \quad of \quad {O}_{2} \quad consumed$$

B
$$\dfrac{Volume \quad of \quad {O}_{2} \quad consumed}{Volume \quad of \quad C{O}_{2} \quad evolved}$$

C
$$\dfrac{Volume \quad of \quad C{O}_{2} \quad evolved}{Volume \quad of \quad {O}_{2} \quad consumed}$$

D
$$\dfrac{Volume \quad of \quad {O}_{2} \quad evolved}{Volume \quad of \quad C{O}_{2} \quad consumed}$$

Solution

Respiratory Quotient refers to ratio of volume of carbon dioxide released to the volume of oxygen consumsed in given time. It is expressed as volumeof $$CO_2$$ evolved/ Volume of $$O_2$$ consumed. Correct answer is C.
Question 9
1 / -0

During complete oxidation of one glucose molecule, the number of ATP molecules obtained by direct substrate level phosphorylation is

A
2

B
4

C
6

D
8

Solution

The process of ATP formation is phosphorylation. There is production of ATP from the ADP molecules by the addition of the phosphate group. This is called as substrate level phosphorylation. In the process of glycolysis, there is formation of 4 ATP molecules. There is net gain of 2 ATP molecules because 2 ATP molecules are used in the reaction.
Thus, the correct answer is option B.
Question 10
1 / -0

Removal of water molecule from the substrate is called

A
Enolation

B
Phosphorylation

C
Decarboxylation

D
Oxidation
Solution
- Enolation is a type of reaction that takes place during the glycolysis pathway. A molecule of 2-phosphoglyceric acid is dehydrated to form a molecule of 2-phosphoenol pyruvic acid by the help of the enzyme enolase.
- During this process, there is the removal of a water molecule from the substance. This reaction is called as enolation.
Thus, the correct answer is option A.

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Re-Attempt Weekly Quiz Competition

Respiration in Plants Test - 48

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Respiration in Plants Test - 48

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SHARING IS CARING

Question 1

The hydrolysis of ATP to ADP and $$P_i$$.

The presence of glucose as a substrate.

The presence of oxygen and its conversion to carbon dioxide.

The synthesis of pyruvate.

Solution

Question 2

Production of pyruvate

Production of Acetyl-CoA

Production of NADH

Production of ATP

Production of lactic acid

Solution

Question 3

2-PGA.

$$\alpha$$ -Ketone.

Succinyl Co-A.

Acetyl Co-A.

Solution

Question 4

Cristae of the mitochondria.

Outer membrane of the mitochondria.

Mitochondrial matrix.

Mitochondrial intermembrane space.

Solution

Question 5

Alcoholic fermentation

Photorespiration

Lactate fermentation

Aerobic respiration

Solution

Question 6

Cytoplasm.

Mitochondrial matrix.

Intermembrane space of mitochondria.

Racker's particles.

Solution

Question 7

Oxaloacetic acid

Pyruvic acid

Acetyl CoA

Malic acid

Solution

Question 8

$$Volume \quad of \quad C{O}_{2} \quad evolved = volume \quad of \quad {O}_{2} \quad consumed$$

$$\dfrac{Volume \quad of \quad {O}_{2} \quad consumed}{Volume \quad of \quad C{O}_{2} \quad evolved}$$

$$\dfrac{Volume \quad of \quad C{O}_{2} \quad evolved}{Volume \quad of \quad {O}_{2} \quad consumed}$$

$$\dfrac{Volume \quad of \quad {O}_{2} \quad evolved}{Volume \quad of \quad C{O}_{2} \quad consumed}$$

Solution

Question 9

2

4

6

8

Solution

Question 10

Enolation

Phosphorylation

Decarboxylation

Oxidation

Solution

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