Question 1

How many molecules of pyruvic acid are produced at the end of glycolysis from 206 molecules of glucose ?

Accepted Answer

In glycolysis, one molecule of glucose is broken down to produce two molecules of pyruvic acid. Therefore, the number of pyruvic acid molecules produced from 206 molecules of glucose is 206 2 = 412. Answer: 412

Question 2

2\ ( C _ 51 H _ 98 C _6) + 145\ O _2 102\ CO _2 + 98\ H _2 O + energy The Respiratory Quotient (RQ) of a biomolecule, used for respiration, as per the above equation would be :

Accepted Answer

The respiratory quotient (RQ) is defined as the ratio of the volume of carbon dioxide evolved to the volume of oxygen consumed during respiration. From the given balanced chemical equation: Volume of CO _2 evolved = 102 Volume of O _2 consumed = 145 RQ = 102 145 0.7 The calculated value of RQ is approximately 0.7, which lies between 0.5 and 0.95. Answer: Between 0.5 and 0.95

Question 3

Match List I with List II : List I (Process) List II (Location) A. Glycolysis I. Inner mitochondrial membrane B. ETS II. Mitochondrial matrix C. Accumulation of protons III. Cytoplasm D. Krebs' cycle

Accepted Answer

Glycolysis is the first step of cellular respiration and occurs in the cytoplasm of the cell. The Electron Transport System (ETS) is located in the inner mitochondrial membrane. During ETS, protons are pumped from the mitochondrial matrix to the intermembrane space, leading to the accumulation of protons in the intermembrane space. The Krebs' cycle (TCA cycle) takes place in the mitochondrial matrix. Therefore, the correct matching is A-III, B-I, C-IV, D-II. Answer: A-III, B-I, C-IV, D-II

Question 4

The complex II of mitochondrial electron transport chain is also known as

Accepted Answer

Complex II of mitochondrial electron transport chain is also known as succinate dehydrogenase. Cytochrome c oxidase (complex IV), NADH dehydrogenase (complex I), cytochrome bc _1 (complex III).

Question 5

Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate.

Accepted Answer

Oxidation involves the loss of electrons (often as part of hydrogen) from a molecule, leaving to an increase in its oxidation state. This process is typically associated with the transfer of electrons to an electron acceptor which is reduced in the process. The conversion of succinyl CoA to succinic acid does not involve oxidation of substrate.

Question 6

Match List-I with List-II : array llll List-I & & List-II \ . & ETS Complex I & I. & NADH Dehydrogenase \ . & ETS Complex II & II. & Cytochrome bC _1 \ . & ETS Complex III & III. & Cytochrome C oxidas

Accepted Answer

ETS complex I NADH dehydrogenase ETS complex II Succinate dehydrogenase ETS complex III Cytochrome bC b complex _1 ETS complex IV Cytochrome C oxidase complex Hence the correct answer is option (2)

Question 7

Match List I with List II array |l|l|c|l| & List I & & List II \ A. & Citric acid cycle & I. & Cytoplasm \ B. & Glycolysis & II. & Mitochondrial matrix \ C. & Electron transport system & III. & Int

Accepted Answer

Citric acid cycle occurs in mitochondrial matrix. Glycolysis occurs in cytosol in most of the organism. Electron transport system is present in the inner mitochondrial membrane. Proton gradient is formed across the intermembrane space of mitochondria.

Question 8

Which of the following are correct about cellular respiration? A. Cellular respiration is the breaking of C - C bonds of complex organic molecules by oxidation. B. The entire cellular respiration take

Accepted Answer

The entire cellular respiration do not take place in mitochondria. The process of glycolysis during respiration occur in cytoplasm of cell. Hence statement A, C, D and E are correct.

Respiration in Plants — Previous Year Questions & Solutions