Respiration in Plants Test

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Respiration in Plants Test - 81

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Weekly Quiz Competition

Question 1
1 / -0

Which one is incorrect with respect to cell respiration?

A
Krebs cycle produces $$CO_2$$

B
Glycolysis requires $$O_2$$

C
$$NADH_2$$ is oxidised in $$ETC$$

D
None of these
Question 2
1 / -0

Which of these statements is correct?

A
Glycolysis occurs in cytosol.

B
Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.

C
Enzymes of TCA cycle are present in mitochondrial matrix.

D
Oxidative phosphorylation takes place in outer mitochondrial membrane.
Solution
- Glycolysis is the first phase of cellular respiration. It takes place in the cytoplasm where associated enzymes and factors are located.
- Enzymes of the TCA cycle are located in the mitochondrial matrix except one which is located in the inner mitochondrial membrane in eukaryotes and in the cytosol in prokaryotes.
- Oxidative phosphorylation takes place in the inner mitochondrial membrane.
So, option A is incorrect.
Question 3
1 / -0

Select the incorrect statement regarding Kreb's cycle.

A
The FAD molecular is reduced to$$ FADH_2$$ during the conversion succinic acid to fumaric acid

B
Substrate level phosphorylation

C
Succinate dehydrogenase in formded atached to the inner mitochondrial membrane

D
The cycle starts with condensation of acetyl CoA with citric acid
Question 4
1 / -0

What is produced by fermentation of agricultural waste?

A
Ethanol

B
Ethanol Amine

C
Aminoacids

D
Base
Question 5
1 / -0

In Citric acid cycle how many substrate level phosphorylation (s) occur between $$\alpha-$$ ketoglutaric acid and succinic acid?

A
Four

B
One

C
Two

D
Three
Question 6
1 / -0

During fermentation what does not occurs ___________________.

A
Oxidation of glucose into pyruvate

B
Substrate level phosphorylation

C
Oxidation of $$NADH_2$$

D
Oxidative phosphorylation.

Solution

Answer is option D i.e. "Oxidative phosphorylation"
Fermentation occurs only when there is no oxidative phosphorylation to maintain the production of ATP by glycolysis. During fermentation, pyruvate is metabolized to various compounds such as lactic acid, ethanol and carbon dioxide or other acids. Also, fermentation reactions occur in the cytoplasm while oxidative phosphorylation occurs in mitochondria.
Question 7
1 / -0

How many ATP are formed in the oxidation of one molecule of glucose through the pentose phosphate path?

A
36

B
38

C
40

D
8

Solution

The pentose phosphate pathway is an alternative to Glycolysis. The end product Ribulose - 5- phosphate formed do not enter Krebs cycle. Instead they are used for the synthesis of nucleotides and other products. However, Fructose -6- phosphate formed may enter glycolysis, and thus Krebs cycle releasing 36 ATP.
So, the correct answer is '36'
Question 8
1 / -0

How many ATP are formed when 2 molecules of NADH + H+ formed in glycolysis enter the ETS via malate aspartate shuttle?

A
Two

B
Four

C
Six

D
Eight

Solution

1 Molecules of NADH$$_2$$ is equivalent 3 ATP molecules, since two NADH$$_2$$ molecules are formed in the transition from glycolysis to malate aspartate shunt. Therefore, the number of ATP formed are $$2\times$$3 =6
So, the correct answer is 'Six'
Question 9
1 / -0

What is the site of the Krebs cycle in cells?

A
Nucleus

B
Cytoplasm

C
Plastids

D
Mitochondria

Solution

The Krebs cycle or Tricarboxylic acid cycle takes place in the matrix of the mitochondria. Here, substrates like Carbohydrates, fats and proteins are oxidised in presence of various enzymes and Oxygen to release ATP.
So, the correct answer is 'Mitochondria'
Question 10
1 / -0

During the Krebs cycle, the first and the only five carbon-containing compounds formed is?

A
Cis-aconitic acid

B
Oxaloacetic acid

C
-ketoglutaric acid

D
Fumaric acid

Solution

$$\alpha$$ -ketoglutaric acid if the first and the only five - Carbon containing compound, formed by the Oxidation and decarboxylation of iso -citrate in presence of enzyme isocitrate dehydrogenase and NAD$$^+$$.
So, the correct answer is '$$\alpha$$ -ketoglutaric acid'

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Re-Attempt Weekly Quiz Competition

Respiration in Plants Test - 81

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Respiration in Plants Test - 81

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SHARING IS CARING

Question 1

Krebs cycle produces $$CO_2$$

Glycolysis requires $$O_2$$

$$NADH_2$$ is oxidised in $$ETC$$

None of these

Question 2

Glycolysis occurs in cytosol.

Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.

Enzymes of TCA cycle are present in mitochondrial matrix.

Oxidative phosphorylation takes place in outer mitochondrial membrane.

Solution

Question 3

The FAD molecular is reduced to$$ FADH_2$$ during the conversion succinic acid to fumaric acid

Substrate level phosphorylation

Succinate dehydrogenase in formded atached to the inner mitochondrial membrane

The cycle starts with condensation of acetyl CoA with citric acid

Question 4

Ethanol

Ethanol Amine

Aminoacids

Base

Question 5

Four

One

Two

Three

Question 6

Oxidation of glucose into pyruvate

Substrate level phosphorylation

Oxidation of $$NADH_2$$

Oxidative phosphorylation.

Solution

Question 7

36

38

40

8

Solution

Question 8

Two

Four

Six

Eight

Solution

Question 9

Nucleus

Cytoplasm

Plastids

Mitochondria

Solution

Question 10

Cis-aconitic acid

Oxaloacetic acid

-ketoglutaric acid

Fumaric acid

Solution

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