Respiration in Plants Test

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Respiration in Plants Test - 69

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Weekly Quiz Competition

Question 1
1 / -0

How many carbon atoms are there in substances labelled as P,Q,R and S respectively in the given representation of Krebs' cycle?

A
PQRS: 4,3,6,4

B
PQRS: 3, 4, 4, 6

C
PQRS: 4,3, 4, 6

D
PQRS: 3,4,6,4
Question 2
1 / -0

The number of times hydration takes place in one Kreb's cycle is :

A
6

B
4

C
3

D
2
Question 3
1 / -0

In Kreb's cycle formation of ___________________.

A
$$34$$ ATP takes place

B
$$38$$ ATP takes place

C
$$15$$ ATP from each acetyl Co-A takes place

D
$$12$$ ATP from each acetyl Co-A takes place $$(24\ ATP)$$
Question 4
1 / -0

Identify X, Y and Z in the given diagram of citric acid cycle and select the correct option.

A
X-GTP, Y-$$NADH_2$$, Z-$$FADH_2$$

B
X-$$FADH_2$$, Y-$$NADH_2$$, Z-GTP

C
X-$$NADH_2$$, Y-$$FADH_2$$, Z-GTP

D
X-$$CO_2$$, Y-$$NADH_2$$, Z-ADP

Solution

The given diagram is of citric acid cycle. It is also called as Krebs cycle. When isocitric acid is converted to α-ketoglutaric acid, NAD$$^+$$ is converted to NADH$$_2$$ and CO$$_2$$ is liberated. This reaction is carried out by enzyme isocitrate dehydrogenase. This α-ketoglutaric acid undergoes oxidative decarboxylation and succinyl CoA is generated with liberation of NADH$$_2$$ and CO$$_2$$. This reaction is carried out by enzyme α-Ketoglutarate dehydrogenase. Succinyl CoA undergoes phosphorylation to produce succinic acid. In this step, GTP is formed from GDP. Succinic acid then undergoes oxidation to produce Fumaric acid by enzyme succinate dehydrogenase. FADH$$_2$$ is generated from FAD in this step.
Thus, the correct answer is 'X-NADH$$_2$$, Y-FADH$$_2$$, Z-GTP.'
Question 5
1 / -0

Choose the correct answers from the alternatives given :
The first process in breaking down glucose is

A
the Krebs cycle

B
glycolysis

C
electron transport system

D
fermentation
Solution
The process of breaking down of glucose is cellular respiration. It has three steps :
Glycolysis
Krebs cycle
Terminal oxidation
Glycolysis is the first basic step where oxygen is not required, it takes place in the cytoplasm of the cell. In this process glucose molecule is broken down into two molecules of pyruvate by the series of enzymatic reaction to obtain energy which is followed by Krebs cycle and then electron transport system while fermentation is anaerobic respiration, it does not require oxygen.
So, the correct option is ' glycolysis'.
Question 6
1 / -0

Which process produces both NADH and $$FADH_2$$?

A
Krebs cycle

B
Glycolysis

C
Electron transport system

D
Fermentation
Solution
In respiration energy is produced by three processes :
Glycolysis
Krebs cycle
Electron transport system
In glycolysis, glucose molecule is broken into two molecules of pyruvate where NADH and ATP are produced. In Krebs cycle acetate is derived from pyruvate by the process of oxidation and degradation, here ATP, NADH, and FADH$$_2$$ are produced.
So, the correct option is ' Krebs cycle'.
Question 7
1 / -0

Acetyl-CoA is produced from

A
pyruvate and a coenzyme

B
citric acid and a coenzyme

C
ATP and pyruvate

D
CO2 and pyruvate

Solution

The process of production of Acetyl CoA is called as transition reaction or link reaction, it links the process of glycolysis ( where glucose is broken down to form two molecules of pyruvate ) to the process of Krebs cycle where pyruvate undergo oxidative decarboxylation and then combines to sulfur-containing coenzyme A to form acetyl CoA.
So, the correct option is ' pyruvate and a coenzyme'.
Question 8
1 / -0

Choose the correct answers from the alternatives given :
Mitochondria are called the powerhouses of the cell. Which one of the following observations supports this statement?

A
Mitochondrion is a cell organelle that possesses a double membrane

B
Mitochondria contain ATP

C
The enzymes of the Krebs cycle and the cytochromes are found in mitochondria

D
Mitochondria are found in almost all kinds of cells

Solution

Mitochondria are the tiny cell organelles present in the cytoplasm which are involved in the release of energy from food, thus they are called as the powerhouse of the cell. Here cellular respiration occurs which requires the enzymes and cytochromes of aerobic respiration.
So, the correct statement is ' The enzymes of the Krebs cycle and the cytochromes are found in mitochondria'.
Question 9
1 / -0

Choose the correct answers from the alternatives given :
In an eukaryotic cell, TCA cycle and electron transport system take place within

A
nucleolus

B
peroxisomes

C
mitochondria

D
stroma
Solution
In eukaryotic cells the cellular respiration occurs in three steps :
Glycolysis
Krebs cycle
Terminal oxidation
Glycolysis occurs in the cytoplasm of the cell where glucose molecule is breakdown into pyruvate, this pyruvate enters the mitochondria through the inner mitochondrial membrane and then it starts Krebs cycle which is later followed by the electron transport system.
so, the correct option is ' mitochondria'.
Question 10
1 / -0

Fatty acids enter cellular respiration as

A
one-carbon fragments

B
two-carbon fragments

C
three-carbon fragments

D
long chain-carbon fragments

Solution

Cellular respiration is the process in which sugar is broken down to obtain energy. The first step of fatty acid in cellular respiration is the entering of acetyl CoA in the Krebs cycle which is after the process of glycolysis. Acetyl CoA is a fatty acid which is two carbon compounds product which gets condensed by an enzyme and forms the first product of Krebs cycle which is six carbon compound.
So, the correct option is ' two-carbon fragments'.

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Respiration in Plants Test - 69

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Respiration in Plants Test - 69

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Question 1

PQRS: 4,3,6,4

PQRS: 3, 4, 4, 6

PQRS: 4,3, 4, 6

PQRS: 3,4,6,4

Question 2

6

4

3

2

Question 3

$$34$$ ATP takes place

$$38$$ ATP takes place

$$15$$ ATP from each acetyl Co-A takes place

$$12$$ ATP from each acetyl Co-A takes place $$(24\ ATP)$$

Question 4

X-GTP, Y-$$NADH_2$$, Z-$$FADH_2$$

X-$$FADH_2$$, Y-$$NADH_2$$, Z-GTP

X-$$NADH_2$$, Y-$$FADH_2$$, Z-GTP

X-$$CO_2$$, Y-$$NADH_2$$, Z-ADP

Solution

Question 5

the Krebs cycle

glycolysis

electron transport system

fermentation

Solution

Question 6

Krebs cycle

Glycolysis

Electron transport system

Fermentation

Solution

Question 7

pyruvate and a coenzyme

citric acid and a coenzyme

ATP and pyruvate

CO2 and pyruvate

Solution

Question 8

Mitochondrion is a cell organelle that possesses a double membrane

Mitochondria contain ATP

The enzymes of the Krebs cycle and the cytochromes are found in mitochondria

Mitochondria are found in almost all kinds of cells

Solution

Question 9

nucleolus

peroxisomes

mitochondria

stroma

Solution

Question 10

one-carbon fragments

two-carbon fragments

three-carbon fragments

long chain-carbon fragments

Solution

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