Respiration in Plants Test

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Respiration in Plants Test - 59

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Weekly Quiz Competition

Question 1
1 / -0

A sudden change from anaerobic to aerobic process produces ________________.

A
Pasteur effect

B
Emerson effect

C
Blackmans law

D
Chargaffs rule

Solution

Answer is option A i.e. "Pasteur effect"
Pasteur effect is exhibited in yeast cells during anaerobic fermentation. Pasteur effect influences the rate of glycolysis and occurs in presence of oxygen which decreases the rate of sugar breakdown in yeast.
While, Blackman's law and Emerson effect is related to determining the rate of photosynthesis. Chargraff's rule is a rule for base equivalence in DNA.
Question 2
1 / -0

Decline in activity of enzyme hexokinase by glucose 6-phosphate is caused by

A
Non-competitive inhibition

B
Competitive inhibition

C
Allosteric modulator

D
Denaturation of enzyme

Solution

Hexokinase is a regulatory enzyme which catalyses the entry of glucose into glycolytic pathway. The enzyme catalyses the conversion of glucose into glucose-6-phosphate. Hexokinase has high affinity for glucose. the hexokinase is allosterically inhibited by its own product which is glucose-6-phosphate. When the concentration of glucose-6-phosphate increases, it binds with the enzyme at its allosteric site and brings about the conformational change in the enzyme. Due to this enzyme can no longer bind to the glucose and the forward reaction is inhibited. Such type of inhibition is known as feedback inhibition.
Thus, the correct answer is option B.
Question 3
1 / -0

Component of ETC of mitochondria is

A
Carotenoids

B
Plastocyanin

C
Phytochrome

D
Cytochrome oxidase

Solution

ETC or Electron transport chain is a stepwise process of electron transfer that carries out final oxidation to produce energy as ATP. One of the related enzymes in ETC is cytochrome oxidase which forms a complex and carries electrons down the energy levels. The released energy is in the form of ATP.
So, the answer is 'Cytochrome oxidase'.
Question 4
1 / -0

Electron transport system occurs in

A
Outer membrane of mitochondria.

B
Cristae of mitochondria.

C
Matrix of mitochondria.

D
Oxysomes.

Solution

Electron transport chain is the process which produces ATP in the final steps of cellular respiration, occurs in the inner mitochondrial membrane. The mitochondrion has an outer membrane and an inner membrane with folds called as cristae. The electron transport chain is a series of transmembrane proteins found in the inner membrane.
Question 5
1 / -0

Two names referring to same thing

A
Krebs cycle and Calvin cycle.

B
Tricarboxylic acid cycle and citric acid cycle.

C
Citric acid cycle and Calvin cycle.

D
Tricarboxylic acid cycle and urea cycle.

Solution

Krebs cycle also called the Citric acid cycle or Tricarboxylic acid cycle.
So the correct option is 'Tricarboxylic acid cycle and citric acid cycle.'
Question 6
1 / -0

Select the correct match for the following :
a) Net ATP produced in glycolysis
b) Positive Benedicts test
c) Genes unable to express in presence of their alleles
d) A character controlled by many genes

A
36, glucose, recessive, polygenic

B
8, glucose, recessive, polygenic

C
32, sucrose, recessive, polygenic

D
8, fructose, dominant, polygenic
Question 7
1 / -0

Anaerobic respiration following glycolysis is

A
Oxidative phosphorylation

B
Krebs cycle

C
Fermentation

D
Both A and B

Solution

Following glycolysis, if the oxygen is available, end products of glycolysis directly enter Krebs' cycle for further oxidation and energy production. In anaerobic conditions, it chooses to get fermented and the end product is another organic substance which is incompletely oxidised, producing less energy.
So, the correct answer is 'Fermentation'.
Question 8
1 / -0

Enzymes of Krebs cycle occur in mitochondrial matrix except one which is attached to inner mitochondrial membrane

A
Citrate synthetase

B
keto glutarate dehydrogenase

C
Succinate dehydrogenase

D
Malate dehydrogenase

Solution

Glycolysis is followed by Krebs' cycle which occurs in mitochondria. Almost the entire process occurs in the mitochondrial matrix except succinate dehydrogenase, an enzyme that converts succinic acid to fumaric acid. This enzyme is present in the inner membrane of mitochondria.
So the answer is 'Succinate dehydrogenase'.
Question 9
1 / -0

What is true for Krebs cycle?

A
ATP / GTP is formed

B
Two decarboxylations

C
Acetyl CoA combines with OAA

D
All of the above.

Solution

Pyruvate formed from glycolysis enter into Krebs cycle and yields high-energy molecules of NADH and FADH as well as some ATP. Each three-carbon pyruvic acid molecule undergoes conversion to a substance called acetyl-coenzyme A, or acetyl-CoA.
So the correct option 'ATP/GTP is formed, two decarboxylations, acetyl CoA combines with OAA.'
Question 10
1 / -0

At the end of citric acid cycle most of the energy is transferred to

A
NADH and FADH$$_2$$.

B
Oxaloacetic acid.

C
Citric acid.

D
ATP.

Solution

For one glucose molecule, Citric acid cycle produces reduced electron carriers, 8 molecules of NADH and 2 molecules of FADH$$_2$$.
So the correct option is 'NADH and FADH$$_2$$.'

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Re-Attempt Weekly Quiz Competition

Respiration in Plants Test - 59

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Respiration in Plants Test - 59

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SHARING IS CARING

Question 1

Pasteur effect

Emerson effect

Blackmans law

Chargaffs rule

Solution

Question 2

Non-competitive inhibition

Competitive inhibition

Allosteric modulator

Denaturation of enzyme

Solution

Question 3

Carotenoids

Plastocyanin

Phytochrome

Cytochrome oxidase

Solution

Question 4

Outer membrane of mitochondria.

Cristae of mitochondria.

Matrix of mitochondria.

Oxysomes.

Solution

Question 5

Krebs cycle and Calvin cycle.

Tricarboxylic acid cycle and citric acid cycle.

Citric acid cycle and Calvin cycle.

Tricarboxylic acid cycle and urea cycle.

Solution

Question 6

36, glucose, recessive, polygenic

8, glucose, recessive, polygenic

32, sucrose, recessive, polygenic

8, fructose, dominant, polygenic

Question 7

Oxidative phosphorylation

Krebs cycle

Fermentation

Both A and B

Solution

Question 8

Citrate synthetase

keto glutarate dehydrogenase

Succinate dehydrogenase

Malate dehydrogenase

Solution

Question 9

ATP / GTP is formed

Two decarboxylations

Acetyl CoA combines with OAA

All of the above.

Solution

Question 10

NADH and FADH$$_2$$.

Oxaloacetic acid.

Citric acid.

ATP.

Solution

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