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Respiration in Plants · Question 20

NEET 2018MCQEasy📈 Topic in 38% papers+4−1
1

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.

Answer

(3) It functions as an electron carrier.

Solution

In glycolysis and the Krebs cycle, NAD+ accepts hydrogen (electrons) and is reduced to NADH + H+.

⇒ As per NCERT, NADH + H+ is then oxidised by the electron transport system, passing electrons to O2.

∵ It is a coenzyme that shuttles electrons, not an enzyme, nor the final acceptor (O2 in aerobic respiration),

∴ NAD+ functions as an electron carrier.

Answer: (3)

NEET 2018

Keep practising — Respiration in Plants

2

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.
NEET 2018
3

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+.
NEET 2017
4

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
NEET 2016 (Phase 2)
5

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.
NEET 2016 (Phase 2)
6

Cytochromes are found in

  1. cristae of mitochondria
  2. lysosomes
  3. matrix of mitochondria
  4. outer wall of mitochondria.
AIPMT 2015 (Cancelled)
7

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
AIPMT 2014
8

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
NEET 2013
9

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.
NEET 2013
10

In mitochondria, protons accumulate in the

  1. outer membrane
  2. inner membrane
  3. intermembrane space
  4. matrix
AIPMT 2011 (Mains)
11

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
AIPMT 2010 (Prelims)

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