NEET Biology Respiration In Plants MCQs Set B

Question. Mineral activator needed for the enzyme isocitrate dehydrogenase of TCA cycle is
(a) Mn
(b) Cu
(c) Mg
(d) Fe

Answer: A

Question. Fumarase enzyme converts
(a) Fumaric acid to malic acid
(b) Succinic acid to malic acid
(c) Succinic acid to fumaric acid
(d) Fumaric acid to citric acid

Answer: A

Question. A Krebs cycle intermediate as raw material for chlorophyll production is synthesised after
(a) Oxidative decarboxylation
(b) Substrate level phosphorylation
(c) Condensation
(d) Hydration

Answer: A

Question. Select the correct statement w.r.t. Krebs cycle
(a) Intermediate products contain four, five and six carbon atoms
(b) Favoured by coenzyme NADP⁺
(c) Substrate molecule is a 3C compound
(d) None of these

Answer: A

Question. The complex concerned with oxidative phosphorylation in inner mitochondrial membrane is
(a) Complex V
(b) Complex III
(c) Complex II
(d) Complex IV

Answer: A

Question. Mobile electrons carriers in ETS in mitochondrial membrane are
(a) CoQ, Cyt c
(b) PQ, Cyt c
(c) PC, CoQ
(d) PQ, PC

Answer: A

Question. Total number of ATP produced through ETS only from one molecule of 3-phosphoglycerate in aerobic respiration is
(a) 14
(b) 12
(c) 15
(d) 16

Answer: A

Question. Slow oxidation of NADH occurs in
(a) Fermentation
(b) Aerobic respiration
(c) PPP
(d) Dicarboxylic acid cycle

Answer: A

Question. A false statement regarding cytochrome c-oxidase complex in ETS in mitochondria is
(a) Receives electrons directly from ubiquinone
(b) Extend across the thickness of inner mitochondrial membrane
(c) Contains Fe & Cu both
(d) None of these

Answer: A

Question. In prokaryotic cells, number of ATP generated from one glucose molecule is
(a) 38
(b) 34
(c) 32
(d) 36

Answer: A

Question. The efficiency of respiration is approximately
(a) 45%
(b) 50%
(c) 90%
(d) 30%

Answer: A

Question. Mark the incorrect statement.
(a) Incomplete oxidation of pyruvate by the stepwise removal of all the hydrogen atoms, leaving three molecules of CO₂
(b) Initial stage of cellular respiration takes place in cytoplasm
(c) Breaking of C – C bonds of complex organic molecules by oxidation cells leading to the release of a lot of energy is called cellular respiration
(d) TCA cycle starts with the condensation of acetyl group with OAA and H₂O to yield citric acid

Answer: A

Question. Inhibition of sugar breakdown due to the presence of O2 under anaerobic condition is called
(a) Pasteur effect
(b) Warburg effect
(c) Crabtree effect
(d) Kutusky effect

Answer: A

Question. Common molecule formed from all food stuffs during aerobic respiration is
(a) Acetyl CoA
(b) PGAL
(c) Glucose
(d) Pyruvic acid

Answer: A

Question. From the oxidation of one molecule of palmitic acid (fatty acid), the number of ATP molecules gained as net are
(a) 129
(b) 131
(c) 38
(d) 142

Answer: A

Question. The value of RQ when the respiratory substances are poor in oxygen is
(a) Less than one
(b) Infinity
(c) Zero
(d) Greater than one

Answer: A

Question. Location of SDH enzyme of Krebs cycle in plants is
(a) Inner mitochondrial membrane
(b) Matrix
(c) Plasma membrane
(d) Cytoplasm

Answer: A

Question. Cytochromes are found in
(a) Cristae of mitochondria
(b) Matrix of mitochondria
(c) Lysosomes
(d) Outer wall of mitochondria

Answer: A

Question. In which one of the following processes CO₂ is not released?
(a) Lactate fermentation
(b) Aerobic respiration in animals
(c) Aerobic respiration in plants
(d) Alcoholic fermentation

Answer: A

Question. Which of the metabolites is common to respiration mediated breakdown of fats, carbohydrates and proteins?
(a) Acetyl CoA
(b) Fructose 1,6-bisphosphate
(c) Pyruvic acid
(d) Glucose-6-phosphate

Answer: A

Question. Read the following four statements (A-D)
(A) Both, photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane
(B) In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth
(C) Stamens in flowers of Gloriosa and Petunia are polyandrous
(D) Symbiotic nitrogen-fixers occur in free-living state also in soil
(a) Two
(b) Three
(c) Four
(d) One

Answer: A

Question. The energy releasing metabolic process in which substrate is oxidised without an external electron acceptor is called
(a) Glycolysis
(b) Fermentation
(c) Aerobic respiration
(d) Photorespiration

Answer: A

Question. Aerobic respiratory pathway is appropriately termed:
(a) Amphibolic
(b) Anabolic
(c) Catabolic
(d) Parabolic

Answer: A

Question. A competitive inhibitor of succinic dehydrogenase is
(a) Malonate
(b) Oxaloacetate
(c) Malate
(d) ketoglutarate

Answer: A

Question. The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because
(a) A proton gradient forms across the inner membrane
(b) ADP is pumped out of the matrix into the intermembrane space
(c) High energy bonds are formed in mitochondrial proteins
(d) There is a change in the permeability of the inner mitochondiral membrane toward adenosine diphosphate(ADP)

Answer: A

Question. The overall goal of glycolysis, Krebs cycle and the electron transport system is the formation of:
(a) ATP in small stepwise units
(b) Sugars
(c) Nucleic acids
(d) ATP in one large oxidation reaction

Answer: A

Question. All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is:
(a) Succinate dehydrogenase
(b) Isocitrate dehydrogenase
(c) Lactate dehydrogenase
(d) Malate dehydrogenase

Answer: A

Question. How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to CO₂and H₂O yields 686 kcal and the useful chemical energy available inthe high energy phosphate bond of one mole of ATP is 12 kcal ?
(a) Fifty seven
(b) One
(c) Thirty
(d) Two

Answer: A

Question. During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?
(a) Electron transport chain
(b) Krebs cycle
(c) Conversion of pyruvic acid to acetyl Co-A
(d) Glycolysis

Answer: A

Question. Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on
(a) Proton gradient
(b) Accumulation of Na ions
(c) Accumulation of K ions
(d) Membrane potential

Answer: A

Question. Glycolysis
(a) Reduces two molecules of NAD⁺ for every glucose molecule processed
(b) Has no connection with electron transport chain
(c) Produces no ATP
(d) Takes place in the mitochondria

Answer: A

Question. The first phase in the breakdown of glucose, in animal cell, is
(a) Glycolysis
(b) E.T.S.
(c) Krebs cycle
(d) Fermentation

Answer: A

Question. At the end of glycolysis, six carbon compound ultimately changes into
(a) Pyruvic acid
(b) ATP
(c) Acetyl Co-A
(d) Ethyl alcohol

Answer: A

Question. In glycolysis, during oxidation electrons are removed by
(a) NAD⁺
(b) ATP
(c) Glyceraldehyde-3-phosphate
(d) Molecular oxygen

Answer: A

Question. The organism used for alcohol fermentation, is
(a) Saccharomyces
(b) Pseudomonas
(c) Penicillium
(d) Aspergillus

Answer: A

Question. Which of the following products are obtained by anaerobic respiration from yeast?
(a) All of these
(b) Alcohols
(c) Beer and wine
(d) CO₂

Answer: A

Question. During the formation of bread, it becomes porous due to release of CO₂ by the action of
(a) Yeast
(b) Bacteria
(c) Virus
(d) Protozoans

Answer: A

Question. In alcohol fermentation
(a) Triose phosphate is the electron donor while acetaldehyde is the electron acceptor
(b) There is no electron donor
(c) Triose phosphate is the electron donor while pyruvic acid is the electron acceptor
(d) Oxygen is the electron acceptor

Answer: A

Question. Dough kept overnight in warm weather becomes soft and spongy because of
(a) Fermentation
(b) Absorption of carbon dioxide from atmosphere
(c) Cohesion
(d) Osmosis

Answer: A

Question. In Krebs cycle, the FAD precipitates as electron acceptor during the conversion of
(a) Succinic acid to fumaric acid
(b) Fumaric acid to malic acid
(c) Succinyl CoA to succinic acid
(d) ketoglutarate to succinyl CoA

Answer: A

Question. Which of the following is the key intermediate compound linking glycolysis to the Krebs cycle?
(a) Acetyl CoA
(b) NADH
(c) ATP
(d) Malic acid

Answer: A

Question. In which one of the following do the two names refer to one and the same thing ?
(a) Tricarboxylic acid cycle and citric acid cycle
(c) Krebs cycle and Calvin cycle
(d) Citric acid cycle and Calvin cycle

Answer: A

Question. In mitochondria, protons accumulate in the
(a) Intermembrane space
(b) Outer membrane
(c) Matrix
(d) Inner membrane

Answer: A

Question. The ultimate respiratory substrate, yielding maximum number of ATP molecules, is
(a) Glucose
(b) Glycogen
(c) Ketogenic amino acid
(d) Amylose

Answer: A

Question. When one molecule of ATP is disintegrated, the amount of energy liberated is
(a) 8.15 kcal
(b) 4.5 kcal
(c) 38 kcal
(d) 1.8 kcal

Answer: A

Question. The correct sequence of electron acceptor in ATP synthesis is
(a) Cyt. b, c, a, a₃
(b) Cyt. a₃, a, b, c
(c) Both
(d) None of these

Answer: A

Question. The mechanism of ATP formation both in chloroplast and mitochondria is explained by
(a) Chemiosmotic theory
(b) Relay pump theory of Godlewski
(c) Munch’s hypothesis (mass flow model)
(d) Cholodny-Went’s model

Answer: A

Question. Net gain of ATP molecules, during aerobic respiration, in heart cells is
(a) 38 molecules
(b) 48 molecules
(c) 40 molecules
(d) 36 molecules

Answer: A

Question. How many ATP molecules will be produced in muscles by aerobic oxidation of one molecule of glucose?
(a) 36
(b) 34
(c) 4
(d) 2

Answer: A

Question. Plants, but not animals, can convert fatty acids to sugars by a series of reactions called
(a) Glyoxylate cycle
(b) Glycolysis
(c) Krebs cycle
(d) Photosynthesis

Answer: A

Question. Pasteurization is a process, which means heating of drinks. It is carried out, at what temperature and for how much duration?
(a) 60-70°C and 30 minutes
(b) 80°C and 30 minutes
(c) 70°C and 60 minutes
(d) 120°C and 60 minutes

Answer: A