Respiration in Plants Test

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Respiration in Plants Test - 26

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Weekly Quiz Competition

Question 1
1 / -0

Oxidation of succinate to fumarate in the Kreb's cycle is due to

A
Loss of electron from it

B
Removal of hydrogen from it

C
Addition of oxygen to it

D
None of the above

Solution

Succinate dehydrogenase enzyme catalyzes the oxidation of succinate by removal of its two hydrogen atoms and forms fumarate. The removed hydrogen atoms reduce the FAD into $$FADH_2$$ that enters mitochondrial electron transport chain. Thus, the correct answer is option B.
Question 2
1 / -0

Krebs cycle is also known as

A
TCA cycle

B
Citric acid cycle

C
Tricarboxylic cycle

D
All of the above

Solution

The Krebs cycle is a series of chemical reactions that takes place in mitochondria and is known as citric acid cycle as the first product formed is citric acid. It is also known as TCA (Tricarboxylic acid) cycle because citric acid is tricarboxylic acid containing 3 carboxylic groups.
Question 3
1 / -0

Krebs cycle begins with

A
Pyruvic acid

B
Hydrochloric acid

C
Corticosteroids

D
Lysine

Solution

Pyruvic acid is the final product of glycolysis. It is then used as respiratory substrate for Krebs cycle. Thus, Kreb's cycle begins with pyruvic acid.
Question 4
1 / -0

In how many steps, $$CO_{2}$$ is released in aerobic respiration of pyruvic acid?

A
One

B
Six

C
Three

D
Twelve
Solution
In three different steps of aerobic respiration of pyruvic acid, $$CO_2$$ is released. Those steps are:
During acetyl Co-A formation.
During formation of alpha-ketoglutaric acid in Krebs cycle.
During succinic acid formation in Krebs cycle.
Question 5
1 / -0

How many ATP molecules could maximally be generated from one molecule of glucose if the complete oxidation of one mole of glucose to $$CO_{2}$$ and $$H_{2}O$$ yields 686 kcal and the useful chemical energy available in the high energy phosphate bonds of one mole of ATP is 12 kcal?

A
Fifty-seven

B
One

C
Two

D
Thirty

Solution

Complete oxidation of one mole of glucose yields = 686 kcal.
Chemical energy available in high energy phosphate bonds of one mole of ATP = 12 ATP
ATP molecules maximally generated from one molecule of glucose = 686/12 = 57 ATP molecules.
Question 6
1 / -0

The full form of NAD is

A
Nicotine adenosine diphosphate

B
Nicotinamide adenosine dinucleotide

C
Nicotinamide adenine dinucleotide

D
Nicotinamide adenine diphosphate

Solution

The full form of NAD is nicotinamide adenine dinucleotide. It is a cofactor that is found in living cells. It exists in two forms, that is oxidized form (NAD$$^+$$) and reduced form (NADH). It carries electrons from one reaction to other. It has vital role in energy production via redox reaction.
Thus, the correct answer is option C.
Question 7
1 / -0

The cycle in which pyruvic acid is broken down in the presence of oxygen is known as

A
Glycolysis

B
Kreb's cycle

C
Anaerobic respiration

D
None of the above

Solution

Glycolysis is the first step of cellular respiration that breaksdown glucose into two molecules of pyruvic acid independent of presence or absence of oxygen. The pyruvic acid is then decarboxylated into acetyl CoA and enters Kreb cycle where in it is aerobically broken down; the pathway takes place in mitochondrial matrix. Anerobic respiration breaks down pyruvic acid in absence of oxygen into ethanol or lactic acid. Correct answer is B.
Question 8
1 / -0

Minerals activator needed for the enzyme carboxylase of TCA cycle is

A
$$Mg^{++}$$

B
$$Fe^{+++}$$

C
$$Mo^{++}$$

D
$$Ca^{++}$$

Solution

Carboxylase enzyme was discovered by Neuberg and Hildesheimer in 1911. It requires $$Mg^{++}$$ or $$Mn^{++}$$ as activator when it acts in citric acid cycle. Carboxylase converts pyruvate to oxaloacetate.
Question 9
1 / -0

Krebs cycle is categorized as

A
Anaerobic respiration

B
Photorespiration

C
Photosynthesis

D
Aerobic respiration

Solution

Krebs cycle is the cycle of chemical reactions taking place in mitochondria and requires oxygen, so it forms a part of aerobic respiration.
Question 10
1 / -0

Activity of succinic dehydrogenase involves which of the following in TCA cycle?

A
NAD

B
FAD

C
GDP

D
ATP

Solution

Succinate dehydrogenase enzyme catalyzes the oxidation of succinate by removal of its two hydrogen atoms and forms fumarate. The removed hydrogen atoms reduce the FAD into $$FADH_2$$ that enters mitochondrial electron transport chain. Thus, the correct answer is option B.

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Respiration in Plants Test - 26

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Respiration in Plants Test - 26

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SHARING IS CARING

Question 1

Loss of electron from it

Removal of hydrogen from it

Addition of oxygen to it

None of the above

Solution

Question 2

TCA cycle

Citric acid cycle

Tricarboxylic cycle

All of the above

Solution

Question 3

Pyruvic acid

Hydrochloric acid

Corticosteroids

Lysine

Solution

Question 4

One

Six

Three

Twelve

Solution

Question 5

Fifty-seven

One

Two

Thirty

Solution

Question 6

Nicotine adenosine diphosphate

Nicotinamide adenosine dinucleotide

Nicotinamide adenine dinucleotide

Nicotinamide adenine diphosphate

Solution

Question 7

Glycolysis

Kreb's cycle

Anaerobic respiration

None of the above

Solution

Question 8

$$Mg^{++}$$

$$Fe^{+++}$$

$$Mo^{++}$$

$$Ca^{++}$$

Solution

Question 9

Anaerobic respiration

Photorespiration

Photosynthesis

Aerobic respiration

Solution

Question 10

NAD

FAD

GDP

ATP

Solution

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