Respiration in Plants Test

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Respiration in Plants Test - 49

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Question 1
1 / -0

Acetylation of pyruvate takes place in the

A
Perimitochondrial space.

B
Mitochondrial matrix.

C
Cristae.

D
$$F_1$$ particles.

Solution

The conversion of pyruvate to acetyl-CoA is a linker step between glycolysis and Krebs cycle. After the entry of pyruvate in the mitochondria the acetylation takes place in the perimitochondrial space which is the space between the inner and outer mitochondrial membrane. Thus the correct answer is option A.
Question 2
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
- The anaerobic breakdown of the glucose molecule in the cytoplasm of the cell is termed as glycolysis.
- In glycolysis, one molecule of glucose is converted to 2 molecules of pyruvic acid.
- Hence 26 molecules of glucose form 52 molecules of pyruvic acid.
- The pyruvic acid thus formed enters the Krebs cycle in the mitochondria and is used for the production of ATP molecules.
  Thus the correct answer is option D.

Question 3

1 / -0

Given below are some reactions and the enzymes involved. Identify the correct pairs.

	I.		II.
$$1$$.	Fructose $$1, 6$$ diphosphate $$\rightarrow 3$$PGAL $$+$$ DHAP	a.	Enolase
$$2$$.	Citrate $$\rightarrow$$Cis - aconitate	b.	Thiokinase
$$3$$.	Succinyl Co. A $$\rightarrow$$ Succinate	c.	Aconitase
$$4$$.	$$2$$PGA$$\rightarrow$$ PEPA	d.	Aldolase

1- d, 2- c, 3- b, 4- a

1- a, 2- b, 3- c, 4- d

1- b, 2- a, 3- d, 4- c

1- c, 2- b, 3- a, 4- b

Solution

Reactions 1. and 4. belong to the Glycolysis.

When Fructose 1,6 diphosphate convert to a 3 carbon (glyceraldehyde-3-phosphate) and DHAP, the enzyme aldolase is used.

When 2 (2-phosphoglycerate ) converts to 2 (2-phosphoenolpyruvate) the enzyme enolase is used.

The reaction 2. and 3. belong to Kreb cycle

When Citrate converts to cis-aconitate then enzyme aconitase is used.

When Succinyl Co. A convert to Succinate then Thiokinase is used.

So, the correct option is '1- d, 2- c, 3- b, 4- a'

Question 4
1 / -0

Enzyme enolase catalyzes the conversion of 2 PGA to phosphoenol Pyruvic acid in presence of .......... which is the cofactor.

A
$$Mn^{++}$$

B
$$Fe^{++}$$

C
$$Mg^{++}$$

D
Both A and C

Solution

The process in which glucose is broken down to 2 molecules of pyruvate is called glycolysis. The conversion of 2-phosphoglycerate to 2-phosphoenolpyruvate is an intermediate step in glycolysis. This conversion is catalyzed by the enzyme enolase and the cofactor involved is metallic magnesium or manganese. Thus the correct answer is option D.
Question 5
1 / -0

In Kreb's cycle, guanosine triphosphate is formed during the conversion of

A
Isocitrate to oxalosuccinate.

B
Oxalosuccinate to $$\alpha$$-ketoglutarate.

C
Succinyl Co-A to succinate.

D
Fumarate to malate.

Solution

Succinyl-CoA is a high energy compound formed during Kreb cycle by oxidative decarboxylation of alpha-ketoglutarate. The energy released during breakage of thioester bond of succinyl-CoA is used to drive the synthesis of GTP from GDP. This reversible reaction is catalysed by succinyl-CoA synthetase.
So, the correct answer is option C.

Question 6

1 / -0

Column I contains some terms and column II contains their meanings. Match the properly and choose the right answer.

Column I	Column II
A. Glycogenesis	1. Conversion of glycogen to glucose
B. Glycosuria	2. Conversion of glucose to glycogen
C. Glyconeogenesis	3. Excretion of glucose in urine
D. Glycogenolysis	4. Conversion of non-carbohydrate sources to glucose
	5. Conversion of glucose to starch

A- $$1$$, B-$$2$$, C-$$3$$, D-$$4$$

A-$$2$$, B-$$3$$, C-$$4$$, D-$$1$$

A-$$2$$, B-$$1$$, C-$$3$$, D-$$4$$

A-$$1$$, B-$$5$$, C-$$2$$, D-$$4$$

Solution

A. Glycogenesis is the formation of glycogen from glucose. It takes place in the cells of muscle and liver.

B. Glycosuria is a condition in which glucose is excreted in the urine. This is an abnormal condition and is seen in patient with diabetes mellitus

C. Glyconeogenesis is the conversion of glycogen from noncarbohydrates such as protein or fat.

D. Glycogenolysis is the process by which glycogen stored in the liver and muscle cells is converted to glucose to provide energy and to maintain blood glucose levels during fasting.

Thus the correct answer is option B.

Question 7
1 / -0

The number of ATP molecules utilised for the breakdown of one molecule of glucose during glycolysis is

A
62

B
2

C
8

D
4

Solution

Glycolysis is the process in which there is partial oxidation of the glucose molecule carried out. The glucose molecule is broken down to give two molecules of pyruvate. There are 4 ATPs produced but 2 are used up, so the net yield of glycolysis is 2 ATP.
Thus, the correct answer is option B.
Question 8
1 / -0

Oxalosuccinic acid, an intermediary compound of Krebs cycle is a

A
4 carbon compound.

B
3 carbon compound.

C
5 carbon compound.

D
6 carbon compound.

Solution

Oxalosuccinic acid is formed during the fourth step of Kreb's cycle. It is formed from isocitrate which is a 6-C compound by the removal of a pair of hydrogen atoms in the presence of enzyme isocitrate dehydrogenase.
Thus, the correct answer is option D.
Question 9
1 / -0

In pne Krebs cycle, decarboxylation takes place at .......... steps.

A
Five

B
Four

C
Three

D
Two

Solution

In single Krebs cycle decarboxylation takes place at following two steps-
1. First oxidative decarboxylation takes place at fourth step where isocitrate gives off a pair of hydrogen atoms (oxidation) and a molecule of carbon-di-oxide (decarboxylation) and becomes 5-carbon α- ketoglutarate.
2. Second oxidative decarboxylation takes place at fifth step where coenzyme-A reacts with α- ketoglutarateforming 4-carbonsuccinyl-coenzyme A and releasing carbon-di-oxide and a pair of hydrogen atoms.
Thus, the correct answer is option D.
Question 10
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 includes a glycolytic breakdown of glucose into pyruvate followed by the fermentation. The NADH$$_2$$ formed in glycolysis serves as an electron donor. Terminal oxidation and Kreb's cycle are not carried out in the anaerobic respiration. So, the correct answer is option A.

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Respiration in Plants Test - 49

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Respiration in Plants Test - 49

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Question 1

Perimitochondrial space.

Mitochondrial matrix.

Cristae.

$$F_1$$ particles.

Solution

Question 2

52

46

32

26

Solution

Question 3

1- d, 2- c, 3- b, 4- a

1- a, 2- b, 3- c, 4- d

1- b, 2- a, 3- d, 4- c

1- c, 2- b, 3- a, 4- b

Solution

Question 4

$$Mn^{++}$$

$$Fe^{++}$$

$$Mg^{++}$$

Both A and C

Solution

Question 5

Isocitrate to oxalosuccinate.

Oxalosuccinate to $$\alpha$$-ketoglutarate.

Succinyl Co-A to succinate.

Fumarate to malate.

Solution

Question 6

A- $$1$$, B-$$2$$, C-$$3$$, D-$$4$$

A-$$2$$, B-$$3$$, C-$$4$$, D-$$1$$

A-$$2$$, B-$$1$$, C-$$3$$, D-$$4$$

A-$$1$$, B-$$5$$, C-$$2$$, D-$$4$$

Solution

Question 7

62

2

8

4

Solution

Question 8

4 carbon compound.

3 carbon compound.

5 carbon compound.

6 carbon compound.

Solution

Question 9

Five

Four

Three

Two

Solution

Question 10

Glycolysis.

Terminal oxidation.

Krebs cycle.

Acetylation.

Solution

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