Description : Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because (a) effective pumping of CO2 into bundle sheath cells (b) RuBisCO in C4 plants has higher affinity for CO2 (c ... d) the primary fixation of CO2 is mediated via PEP carboxylase. (2005) 65. In sugarcane plant
Last Answer : (d) the primary fixation of CO2 is mediated via PEP carboxylase.
Description : The primary acceptor, during CO2 fixation in C3 plants, is (a) phosphoenolpyruvate (PEP) (b) ribulose 1, 5-diphosphate (RuDP) (c) phosphoglyceric acid (PGA) (d) ribulose monophosphate (RMP).
Last Answer : (b) ribulose 1, 5-diphosphate (RuDP)
Description : In plants, enzyme responsible for the synthesis of the malic acid is : (A) Rubisco (B) PEP carboxylase (C)Kinase (D) Urease
Last Answer : (A) Rubisco
Description : The carbon dioxide acceptor in Calvin cycle/ C3-plants is (a) phosphoenol pyruvate (PEP) (b) ribulose 1, 5-diphosphate (RuDP) (c) phosphoglyceric acid (PGA) (d) ribulose monophosphate (RMP).
Description : The C4 plants are photosynthetically more efficient than C3 plants because (a) the CO2 efflux is not prevented (b) they have more chloroplasts (c) the CO2 compensation point is more (d) CO2 generated during photorespiration is trapped and recycled through PEP carboxylase.
Last Answer : (b) they have more chloroplasts
Description : Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in (a) C4 plants (b) C2 plants (c) C3 and C4 plants (d) C3 plants.
Last Answer : (a) C4 plants
Description : Carbon dioxide acceptor in C3-plants is (a) PGA (b) PEP (c) RuDP (d) none of these.
Last Answer : (c) RuDP
Description : The enzyme that catalyses carbon dioxide fixation in C4 plants is (a) RuBP carboxylase (b) PEP carboxylase (c) carbonic anhydrase (d) carboxydismutase.
Last Answer : (b) PEP carboxylase
Description : Bundle sheath cells (a) are rich in PEP carboxylase (b) lack RuBisCO (c) lack both RuBisCO and PEP carboxylase (d) are rich in RuBisCO.
Last Answer : d) are rich in RuBisCO.
Description : Which of the following anzymes is involved in the primary carboxylation in C4 plants? (a) RUBP Carboxylase (b) PEP(c) Oxygenase (d) Carboxylase
Last Answer : (b) PEP
Description : First CO2 receptor in C4 plants is: (a) PGA (b) PEP (c) RuBD (d) OAA
Last Answer : Ans. ((b))
Description : Name the enzyme that acts both as carboxylase at one time and oxygenase at another time. (A) PEP carboxylase (B) RuBP carboxylase (C) Carbonic anyhdrase (D) None of these
Last Answer : Answer : B
Description : CO2 acceptor in the mesophyll cells of a C4 plant is -Biology
Last Answer : answer:
Description : The primary acceptor of CO2 in C4 cycle is? -Biology
Description : The first carbon dioxide acceptor in C4-plants is (a) phosphoenol-pyruvate (b) ribulose 1, 5-diphosphate (c) oxaloacetic acid (d) phosphoglyceric acid.
Last Answer : (a) phosphoenol-pyruvate
Description : Phosphoenol pyruvate (PEP) is the primary CO 2 acceptor in: (1) C 4 plants (2) C 2 plants (3) C 3 and C 4 plants (4) C 3 plants
Last Answer : (1) C 4 plants
Description : In sugarcane plant 14CO2 is fixed to malic acid, in which the enzyme that fixes CO2 is (a) ribulose biphosphate carboxylase (b) phosphoenol pyruvic acid carboxylase (c) ribulose phosphate kinase (d) fructose phosphatase.
Last Answer : (b) phosphoenol pyruvic acid carboxylase
Description : The most important enzyme involved in photosynthetic CO2 fixation in C4 plants
Last Answer : Ans. PEP carboxylase
Description : Biotin is a coenzyme for (A) Pyruvate dehydrogenase (B) Pyruvate carboxylase (C) PEP carboxykinase (D) Glutamate pyruvate transminase
Description : In C4 plants, CO2 combines with (a) phosphoenol pyruvate (b) phosphoglyceraldehyde (c) phosphoglyceric acid (d) ribulose diphosphate.
Last Answer : (a) phosphoenol pyruvate
Description : In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of (a) bundle sheath (b) phloem (c) epidermis (d) mesophyll.
Last Answer : (d) mesophyll.
Description : In leaves of C4 plants, malic acid synthesis during CO2 fixation occurs in (a) bundle sheath (b) guard cells (c) epidermal cells (d) mesophyll cells
Last Answer : (d) mesophyll cells.
Description : Why is RuBisCo enzyme the most important enzyme in the earth? -Biology
Description : The most abundant enzyme in the living world is - (1) Rubisco (2) invertase (3) DNAse (4) zymase
Last Answer : (1) Rubisco Explanation: Rubisco or ribulose 1, 5 bisphosphate carboxylase oxygenase is the plants enzyme which helps in the dark phase of photosynthesis (in the synthesis of ribulose sugar).
Description : The most abundant enzyme in the living world is - (1) Rubisco (2) Invertase (3) DNAse (4) Zymase
Last Answer : (1) Rubisco Explanation: The abundant enzyme in the living world is Rubisco. It is a key regulator of non-steady state of photosynthesis.
Description : The oxygenation activity of RuBisCO enzyme in photorespiration leads to the formation of (a) 2 molecules of 3-C compound (b) 1 molecule of 3-C compound (c) 1 molecule of 6-C compound (d) 1 molecule of 4-C compound and 1 molecule of 2-C compound
Last Answer : (b) 1 molecule of 3-C compound
Description : The most abundant enzyme in the living world is (1) Rubisco (2) Invertase (3) DNAse (4) Zymase
Last Answer : Rubisco
Description : CO2 accepter in C4 plants is (A) PGA (B) RuBP (C)OAA (D) All
Last Answer : (C)OAA
Description : With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct? (a) Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate. ( ... for higher yield. (d) Light saturation for CO2 fixation occurs at 10% of full sunlight.
Last Answer : (b) C3 plants respond to higher temperature with enhanced photosynthesis while C4 plants have much lower temperature optimum
Description : In C4 plants, CO2 fixation is done by (a) sclerenchyma (b) chlorenchyma and hypodermis (c) mesophyll cells (d) guard cells.
Last Answer : (c) mesophyll cells
Description : How much CO2 is formed by the reaction of 120g of phosphoric acid with limescale (calcium carbonate)? temperature 16 degrees pressure 98kPa
Last Answer : Need Answer
Description : The enzyme regulating extramitochondrial fatty acid synthesis is (A) Thioesterase (B) Acetyl CoA carboxylase (C) Acyl transferase (D) Multi-enzyme complex
Description : In presence of the following cofactor, pyruvate carboxylase converts pyruvate to oxaloacetate: (A) ATP, Protein and CO2 (B) CO2 and ATP (C) CO2 (D) Protein
Last Answer : A
Description : Which is CO2 acceptor in C3 plant? -Biology
Description : Name the primary acceptor of CO2 in C3 cycle. -Biology
Description : Which compound act as co2 accepter in c3 and c4 plant -Biology
Description : Select the correct statement: (1) C4 pathway for. CO2 fixation were discovered by Hatch and Slack (2) CO2 is essential for photosynthesis (3) Addition of sodium carbonate in water retards photosynthetic rate in vallisneria (4) Phloem is the principal pathway for translocation of solutes
Last Answer : Ans. ((c))
Description : The CO2 fixation during C4 pathway occurs in the chloroplast of (a) guard cells (b) bundle sheath cells (c) mesophyll cells (d) spongy parenchyma.
Description : Jamaican vomiting sickness is due to inactivation of the enzyme (A) Pyruvate carboxylase (B) Acyl-Co-A synthetase (C) Acyl-Co-A dehydrogense (D) Thiolase
Last Answer : Answer : C
Description : Carboxylation of acetyl-CoA to malonylCoA requires the enzyme: (A) Acetyl-CoA carboxylase (B) Pyruvate carboxylase (C) Acetyl transacylase (D) Acyl CoA-synthetase
Last Answer : Answer : A
Description : In gluconeogensis, an allosteric activator required in the synthesis of oxaloacetate from bicarbonate and pyruvate, which is catalysed by the enzyme pyruvate carboxylase is (A) Acetyl CoA (B) Succinate (C) Isocitrate (D) Citrate
Description : The enzyme pyruvate carboxylase is present in (A) Cytosol (B) Mitochondria (C) Nucleus (D) Golgi bodies
Description : An enzyme involved in gluconeogenesis is (A) Pyruvate kinase (B) Pyruvate carboxylase (C) Hexokinase (D) Phosphohexose isomerase
Description : Biotin is a coenzyme of the enzyme (A) Carboxylase (B) Hydroxylase (C) Decarboxylase (D) Deaminase
Description : Vitamin K is involved in posttranslational modification of the blood clotting factors by acting as cofactor for the enzyme: (A) Carboxylase (B) Decarboxylase (C) Hydroxylase (D) Oxidase
Description : An enzyme required for the synthesis of ketone bodies as well as cholesterol is (A) Acetyl CoA carboxylase (B) HMG CoA synthetase (C) HMG CoA reductase (D) HMG CoA lyase
Description : The defective enzyme in histidinemia is (A) Histidine carboxylase (B) Histidine decarboxylase (C) Histidase (D) Histidine oxidase
Description : Which of the following compound is a positive allosteric modifier of the enzyme pyruvate carboxylase? (A) Biotin (B) Acetyl CoA (C) Oxaloacetate (D) ATP
Description : Which one of the following is a rate limiting enzyme of gluconeogenesis? (A) Hexokinase (B) Phsophofructokinase (C) Pyruvate carboxylase (D) Pyruvate kinase
Last Answer : C