Respiration in Plants

2(C51H98O6) + 145O2 102CO2 + 98H2O + energy The Respiratory Quotient (RQ) of a biomolecule used for respiration, as per the above equation would be :

1. Less than 0.5
2. Between 1.25 and 2
3. 1.0
4. Between 0.5 and 0.95

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

1. 412
2. 206
3. 309
4. 103

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

1. Cytochrome c oxidase
2. NADH dehydrogenase
3. Cytochrome bc1
4. Succinate dehydrogenase

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

1. Malic acid Oxaloacetic acid
2. Succinic acid Malic acid
3. Succinyl-CoA Succinic acid
4. Isocitrate -ketoglutaric acid

Which of the following are correct about cellular respiration? Choose the correct answer from the options given below :

1. A, C, D, E only
2. A, B, E only
3. A, B, C, E only
4. B, C, D, E only

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R: In the light of the above statements, choose the correct answer from the options given below :

1. Both A and R are true but R is NOT the correct explanation of A.
2. A is true but R is false.
3. A is false but R is true.
4. Both A and R are true and R is the correct explanation of A.

What is the net gain of ATP when each molecule of glucose is converted to two molecules of pyruvic acid?

1. Four
2. Six
3. Two
4. Eight

What amount of energy is released from glucose during lactic acid fermentation?

1. Approximately 15%
2. More than 18%
3. About 10%
4. Less than 7%

The 5-C compound formed during TCA cycle is

1. Fumaric acid
2. α-ketoglutaric acid
3. Oxalosuccinic acid
4. Succinic acid

The number of time(s) decarboxylation of isocitrate occurs during single TCA cycle is

1. Four
2. One
3. Two
4. Three

Which of the following statements is incorrect?

1. Oxidation-reduction reactions produce proton gradient in respiration
2. During aerobic respiration, role of oxygen is limited to the terminal stage.
3. In ETC (Electron Transport Chain), one molecule of NADH + H+ gives rise to 2 ATP molecules, and one FADH2 gives rise to 3 ATP molecules
4. ATP is synthesized through complex V

The number of substrate level phosphorylations in one turn of citric acid cycle is

1. Zero
2. One
3. Three
4. Two

Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by

1. Enolase
2. Phosphofructokinase
3. Aldolase
4. Hexokinase

Respiratory Quotient (RQ) value of tripalmitin is :

1. 0.07
2. 0.09
3. 0.9
4. 0.7

What is the role of NAD+ in cellular respiration?

1. It is the final electron acceptor for anaerobic respiration.
2. It functions as an enzyme.
3. It functions as an electron carrier.
4. It is a nucleotide source for ATP synthesis.

Which of these statements is incorrect?

1. Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.
2. Enzymes of TCA cycle are present in mitochondrial matrix.
3. Oxidative phosphorylation takes place in outer mitochondrial membrane.
4. Glycolysis occurs in cytosol.

Which statement is wrong for Krebs' cycle?

1. There is one point in the cycle where FAD+ is reduced to FADH2.
2. During conversion of succinyl CoA to succinic acid, a molecule of GTP is synthesised.
3. The cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid.
4. There are three points in the cycle where NAD+ is reduced to NADH + H+.

Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins?

1. Glucose-6-phosphate
2. Fructose 1, 6-bisphosphate
3. Pyruvic acid
4. Acetyl CoA

Oxidative phosphorylation is

1. formation of ATP by transfer of phosphate group from a substrate to ADP
2. oxidation of phosphate group in ATP
3. addition of phosphate group to ATP
4. formation of ATP by energy released from electrons removed during substrate oxidation.

Cytochromes are found in

1. cristae of mitochondria
2. lysosomes
3. matrix of mitochondria
4. outer wall of mitochondria.

In which one of the following processes CO2 is not released?

1. Aerobic respiration in plants
2. Aerobic respiration in animals
3. Alcoholic fermentation
4. Lactic fermentation

Which of the metabolites is common to respiration-mediated breakdown of fats, carbohydrates and proteins?

1. Pyruvic acid
2. Acetyl CoA
3. Glucose-6-phosphate
4. Fructose-1,6-bisphosphate

The three boxes in this diagram represent the three major biochemical pathways in aerobic respiration. Arrows represent net reactants or products. [figure] Arrows numbered 4, 8 and 12 can all be

1. H2O
2. FAD or FADH2
3. NADH
4. ATP.

In mitochondria, protons accumulate in the

1. outer membrane
2. inner membrane
3. intermembrane space
4. matrix

The energy-releasing metabolic process in which substrate is oxidised without an external electron acceptor is called

1. glycolysis
2. fermentation
3. aerobic respiration
4. photorespiration

Aerobic respiratory pathway is appropriately termed

1. parabolic
2. amphibolic
3. anabolic
4. catabolic.

The energy-releasing metabolic process in which substrate is oxidised without an external electron acceptor is called

1. glycolysis
2. fermentation
3. aerobic respiration
4. photorespiration

The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because

1. a proton gradient forms across the inner membrane
2. there is a change in the permeability of the inner mitochondrial membrane toward adenosine diphosphate (ADP)
3. high energy bonds are formed in mitochondrial proteins
4. ADP is pumped out of the matrix into the intermembrane space

The overall goal of glycolysis, Krebs' cycle and the electron transport system is the formation of

1. ATP in one large oxidation reaction
2. sugars
3. nucleic acids
4. ATP in small stepwise units

All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membrane in eukaryotes and in cytosol in prokaryotes. This enzyme is

1. isocitrate dehydrogenase
2. malate dehydrogenase
3. succinate dehydrogenase
4. lactate dehydrogenase