Free Objective Test 03 Practice Test - 11th and 12th

Question 1

Which of the following statements is NOT correct about glycolysis?

Glycolysis takes place within the cytoplasm

Glycolysis uses two ATP but forms four ATP, resulting in a net gain of two ATP molecules

During glycolysis, two NADH are produced as substrate oxidation occurs

Glycolysis begins with glucose and ends with four pyruvate molecules

SOLUTION

Solution : D

Glycolysis does produce four molecules of pyruvate. It begins with one molecule of Glucose, a 6C compound, which is split into two molecules of pyruvic acid, a 3C compound.

Question 2

Which of the following pathways does NOT occur in aerobic cellular respiration?

Glycolysis

Krebs cycle

Electron transport system

Calvin cycle

SOLUTION

Solution : D

Calvin's cycle does not occur in cellular respiration. This cycle is part of photosynthesis.

Question 3

The proper sequence of stages in glycolysis is

Glucose priming, cleavage and rearrangement, oxidation, ATP generation

Cleavage and rearrangement, glucose priming, ATP generation, oxidation

Glucose priming, oxidation, cleavage and rearrangement, ATP generation

ATP generation, oxidation, glucose priming, cleavage and rearrangement

SOLUTION

Solution : A

Glycolysis is a ten step process. In the first few steps glucose is primed. It is converted to glucose-6-phosphate, which is trapped in the cell and can not leave the cell due to its negative charge. It is then broken down and rearranged to form two high energy 3C molecules of glyceraldehyde-3-phosphate. Glyceraldehyde-3-phosphate then undergoes oxidation to form 1,3-bisphophoglycerate, creating a high energy NADH molecule. The last aspect of glycolysis is the harvest phase, where the ATPs invested in the priming are returned and 2 more is generated as a pay off.

Question 4

In aerobic respiration, first CO2 is liberated during ______.

Oxidation of pyruvic acid

Decarboxylation of oxalosuccinic acid

Decarboxylation of a ketoglutaric acid

Alcoholic fermentation

SOLUTION

Solution : A

In aerobic respiration the first CO2 is liberated during oxidation of pyruvate. Here pyruvate a 3C compound is broken down to acetate, a 2C compound and linked to CoA to form acetyl CoA. The Carbon lost from pyruvate is released as CO2. And the acetyl CoA formed is funnelled into the Kreb's cycle.

Question 5

In the process of respiration, which of these pathways produces the largest amount of phosphate bond energy?

A. Glycolysis

B. Anaerobic Respiration

C. Krebs Cycle

D. Pyruvate oxidation

SOLUTION

Solution : C

Kreb’s cycle provides 2 molecules of GTP directly; 6 molecules of NADH₂ (18 ATP) and two molecules of FADH₂ (4 ATP), i.e., 24 ATP out of 38 ATP.

Question 6

The energy releasing metabolic process in which substrate is oxidized without any external electron acceptor is called ____.

A. Glycolysis

B. Fermentation

C. Aerobic respiration

D. Photorespiration

SOLUTION

Solution : B

In fermentation, the incomplete oxidation of glucose is achieved under, anaerobic condition by set of reactions, where pyruvic acid is converted into carbon dioxide and ethanol. The enzyme, pyruvic acid decarboxylase and alcohol dehydrogenase catalyse these reactions.
In aerobic respiration, the substrates are oxidised in the presence of an external electron acceptor, that is oxygen. Whereas anaerobic respiration, is carried out in the absence of oxygen, therefore they do not have any external electron acceptor. Instead the glycolytic product itself is further used as an electron acceptor to regenerate NAD+.

Question 7

Dough kept overnight in warm weather becomes soft and spongy because of _____.

A. Absorption of carbon dioxide from atmosphere

B. Fermentation

C. Release of carbon dioxide

D. Osmosis

SOLUTION

Solution : B and C

Dough kept in warm weather becomes soft and spongy due to continous release of carbon dioxide during fermentation.

Question 8

Cell respiration is carried out by ________.

A. Ribosome

B. Mitochondria

C. Chloroplast

D. Golgi bodies

SOLUTION

Solution : B

In 1950, Kolliker for the first time saw mitochondria. Later on C Benda coined the term mitochondria. These are the sites of cellular respiration, oxidative phosphorylation, synthesis of heame protein, cytochrome, myoglobin, etc.

Question 9

In which part of the mitochondria does ATP synthesis occur?

A. Matrix

B. Intermembrane space

C. Outer mitochondrial membrane

D. Inner membrane of mitochondria

SOLUTION

Solution : D

ATP synthesis takes place in the ATP synthase complex of the Electron transport chain, which is found in the inner mitochondrial membrane. It is fuelled by the proton gradient created by oxidation of high energy molecules such as NADH and FADH2.

Question 10

Oxidation of one molecule of NADH gives ______.

A. 3 ATP molecules

B. 12 ATP molecules

C. 1 ATP molecule

D. 8 ATP molecules

SOLUTION

Solution : A

Oxidation of one molecule of NADH gives rise to 3 ATP molecules, 2.5 molecules of ATP to be exact according to recent research. The fraction is because ATP production is actually linked to the chemiosmotic diffusion of protons across the proton gradient, rather than a single reaction.

Question 11

In yeast during anaerobic respiration, how many glucose molecules are required for production of 38 ATP molecules?

A. 1

B. 2

C. 19

D. 38

SOLUTION

Solution : C

Anaerobic respiration occurs in the absence of oxygen. It is found in deep-seated tissues plants and animals, germinating seeds, yeasts and bacteria. During anaerobic respiration of yeast, two ATP molecules are produced from each glucose molecule. Hence, 38 ATP will require 19 glucose molecules.

Question 12

The R.Q. is infinity, when ______

A. Carbohydrate is respired aerobically

B. Fat is respired aerobically

C. Protein is respired aerobically

D. Carbohydrate is respired anaerobically

SOLUTION

Solution : D

Respiratory quotient is the ratio of the volume of carbon dioxide evolved to that of oxygen consumed by an organism, tissue, or cell in a given time.

That is, R.Q. = Volume of $C O_{2}$ evolved/ Volume of $O_{2}$ consumed

Since no $O_{2}$ is consumed in anaerobic respiration, R.Q. = Volume of $C O_{2}$ evolved/0 = $\propto$

Question 13

In respiration, the energy not captured by ATP is _______.

A. Transferred to organic compounds

B. Converted to heat

C. Liberated along with

C O_{2}

D. Transferred to water

SOLUTION

Solution : B

Energy is converted into heat if it is not captured by ATP.

Question 14

RQ of germinating Pisum sativum seed is ____.

A. Unity

B. More than unity

C. Less than unity

D. Zero

SOLUTION

Solution : C

RQ or respiratory quotient is the ratio of the volume of oxygen used to the volume of carbon dioxide generated when a given substrate is respired. The RQ for most of the common fats is about 0.7. The Pisum sativum or pea seed contains a lot of fatty acids and during germination, these fats are oxidized. Therefore the RQ od germinating Pisum sativum is about 0.7, that is less than unity.

Question 15

During lactic acid fermentation _______.

O_{2}

is used,

C O_{2}

is liberated

B. Neither

O_{2}

is used, nor

C O_{2}

is liberated

O_{2}

is used,

C O_{2}

is not liberated

O_{2}

is not used,

C O_{2}

is liberated

SOLUTION

Solution : B

In lactic acid fermentation neither $O_{2}$ is used nor $C O_{2}$ is liberated as it is anaerobic respiration.

Free Objective Test 03 Practice Test - 11th and 12th

Question 1

SOLUTION

Question 2

SOLUTION

Question 3

SOLUTION

Question 4

SOLUTION

Question 5

SOLUTION

Question 6

SOLUTION

Question 7

SOLUTION

Question 8

SOLUTION

Question 9

SOLUTION

Question 10

SOLUTION

Question 11

SOLUTION

Question 12

SOLUTION

Question 13

SOLUTION

Question 14

SOLUTION

Question 15

SOLUTION

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