Helicase and DNAB protein cause (A) Rewinding of DNA and require ATP as a source of energy (B) Rewinding of DNA but do not require any source of energy (C) Unwinding of DNA and require ATP as a source of energy (D) Unwinding of DNA but do not require any source of energy

Helicase and DNAB protein cause (A) Rewinding of DNA and require ATP as a source of energy (B) Rewinding of DNA but do not require any source of energy (C) Unwinding of DNA and require ATP as a source of energy (D) Unwinding of DNA but do not require any source of energy
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During replication, unwinding of double helix is initiated by (A) DNAA protein (B) DnaB protein (C) DNAC protein (D) Rep protein

Description : During replication, unwinding of double helix is initiated by (A) DNAA protein (B) DnaB protein (C) DNAC protein (D) Rep protein

Last Answer : Answer : B

The enzyme which catalyzes the unwinding of DNA helix during replication is: (1) Primase (2) Topoisomerase (3) Helicase (4) DNA polymerase

Description : The enzyme which catalyzes the unwinding of DNA helix during replication is: (1) Primase (2) Topoisomerase (3) Helicase (4) DNA polymerase

Last Answer : (3) Helicase Explanation: A type of helicase enzyme called DNA helicase catalyzes the unwinding of the DNA helix at the time of replication. It uses the energy released through hydrolysis of ATP ( ... The enzyme is needed to separate the two strands of DNA also during transcription and DNA repair.

The enzyme which catalyzes the unwinding of DNA helix during replication is: (1) Primase (2) Topoisomerase (3) Helicase (4) DNApolymerase

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Last Answer : C option is the answer

From a DNA-RNA hybrid, DNA can be obtained by addition of (A) DNA B protein and ATP (B) Helicase and ATP (C) DNA topoisomerase I (D) Alkali

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For unwinding of double helical DNA, (A) Energy is provided by ATP (B) Energy is provided by GTP (C) Energy can be provided by either ATP or GTP (D) No energy is required

Description : For unwinding of double helical DNA, (A) Energy is provided by ATP (B) Energy is provided by GTP (C) Energy can be provided by either ATP or GTP (D) No energy is required

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Rifampicin inhibits (A) Unwinding of DNA (B) Initiation of replication (C) Initiation of translation (D) Initiation of transcription

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In DNA replication the enzyme required in the first step is (A) DNA directed polymerase (B) Unwinding proteins (C) DNA polymerase (D) DNA ligase

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Last Answer : Answer : B

Negative supercoils are introduced in DNA by (A) Helicase (B) DNA ligase (C) DNA gyrase (D) DNA polymerase III holoenzyme

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Last Answer : Answer : C

An eazyme produced by HIV that allows the integration of HIV DNA into the host cell's DNA is (1) Ligase (2) Integrase (3) Helicase (4) DNA gyrase

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Name the enzyme that facilitates opening of DNA helix during transcription. (a) DNA ligase (b) DNA helicase (c) DNA polymerase (d) RNA polymerase

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During DNA replication, the strands separate by (a) DNA polymerase (b) topoisomerase (c) unwindase/helicase (d) gyrase.

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Last Answer : b) topoisomerase

The enzyme adds complementary bases to the DNA template strand during replication. a. Ligase b. Helicase c. DNA polymerase III d. RNA polymerase

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Enzyme which can break and seal the DNA strand a) Topoisomease II (b) Helicase (c) Primase (d) Restriction endonuclease

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An eazyme produced by HIV that allows the integration of HIV DNA into the host cell’s DNA is : (1) Ligase (2) Integrase (3) Helicase (4) DNA gyrase

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Explain the following Energy conservation methods of electrical motor : (a) Rewinding of motors (b) Operating in star mode

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eIF-4 A possesses (A) ATPase activity (B) GTPase activity (C) Helicase activity (D) None of these

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If a small electric motor has been submerged in saltwater for a short period of time, you should _____________. A. send it ashore for rewinding B. rinse it with warm freshwater and bake it dry in an oven C. soak it in a bucket of commercial solvent and bake with internal heat D. clean it with carbon tetrachloride and blow it out with compressed air

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. After rewinding a tape onto its supply reel, you examine the tape pack and notice pile-ups of tape resembling the example in figure 2-2. What causes this condition?

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DNA po lymerase of T. aquat icus is preferred to that of E. coli in PCR because (A) It replicates DNA more efficiently (B) It doesn’t require primers (C) It is not denatured at the melting temperature of DNA (D) It doesn’t cause errors in replication

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The 2 energy rich compounds needed for protein biosynthesis are (A) ATP and GTP (B) ATP and UTP (C) ATP and CTP (D) ATP and TTP

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Last Answer : Answer : A

The abnormal isoenzyme need not (A) Be an oxidoreductase (B) Have any coenzyme (C) Require ATP (D) Be localized intracellularly (E) Be a catalyst

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Answer: a, b, c, d Free oxygen radicals are chemical species that are intermediates in the normal process of cellular respiration. Oxidants that are free radicals have been implicated as initiators of reactions which lead to a variety of cellular injuries. Oxidants are derived from several sources, notably phagocytes. Among the effects of oxygen free radicals are membrane lipid peroxidation, DNA strand breaks, cytoskeletal disassembly and inhibition of glucose metabolism leading to decreased cellular ATP concentrations. (Figure 6-16) 187 Which of the following acute-phase protein levels are increased in human plasma following acute inflammation? a. C-reactive protein b. Serum amyloid c. a -Proteinase inhibitor d. Fibrinogen e. Albumin

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The mRNA ready for protein synthesis has the ________ cap. (A) ATP (B) CTP (C) GTP (D) UTP

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In the biosynthesis of c-DNA, the joining enzyme ligase requires (A) GTP (B) ATP (C) CTP (D) UTP

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Which of the following contains a deoxy sugar? (A) RNA (B) DNA (C) ATP (D) UTP

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Adenosine Triphosphate (ATP) is (a) an enzyme (b) a protein (c) a hormone (d) a molecule with high energy bonds

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A key energy compound in bacterial photosynthesis by cyanobacteria is ______ and a major end-product is ______. a. GTP; protein b. citrate; lactose c. glucose; chlorophyll d. ATP; glucose

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The mechanism of synthesis of DNA and RNA are similar to all the following ways except (A) They involve release of pyrophosphate from each nucleotide added (B) They require activated nucleotide precursor and Mg2+ (C) The direction of synthesis is (D) They require a primer

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Which one of the following statements correctly describes eukaryotic DNA? (A) They involve release of pyrophosphate from each nucleotide precussor and Mg2+ (B) The direction of synthesis is (C) They require a primer 5’→ 3’ (D) None of these

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Last Answer : Answer : C

The mechanism of synthesis of DNA and RNA are similar in all the following ways except (A) They involve release of pyrophosphate from each nucleotide added (B) They require activated nucleotide precursor and Mg2+ (C) The direction of synthesis is 5’ → 3’ (D) They require a primer

Description : The mechanism of synthesis of DNA and RNA are similar in all the following ways except (A) They involve release of pyrophosphate from each nucleotide added (B) They require activated nucleotide precursor and Mg2+ (C) The direction of synthesis is 5’ → 3’ (D) They require a primer

Last Answer : Answer : A

The correct statement concerning RNA and DNA polymerases is (A) RNA polymerase use nucleoside diphosphates (B) RNA polymerase require primers and add bases at 5’ end of the growing polynucleotide chain (C) DNA polymerases can add nucleotides at both ends of the chain (D) All RNA and DNA polymerases can add nucleotides only at the 3’ end of the growing polynucleotide chain

Description : The correct statement concerning RNA and DNA polymerases is (A) RNA polymerase use nucleoside diphosphates (B) RNA polymerase require primers and add bases at 5' end of the growing polynucleotide ... and DNA polymerases can add nucleotides only at the 3' end of the growing polynucleotide chain

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Source of energy in ecosystem is – (1) Sun (2) Green plants (3) Sugar produced in photosynthesis (4) ATP

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Last Answer : (1) Sun Explanation: An ecosystem is a community of living and non-living things that work together. It includes soil, atmosphere, heat and light from the sun, water and living organisms.

Source of energy in ecosystem is (1) Sun (2) Green plants (3) Sugar produced in photosynthesis (4) ATP

Description : Source of energy in ecosystem is (1) Sun (2) Green plants (3) Sugar produced in photosynthesis (4) ATP

Last Answer : Sun

The pyrimidine nucleotide acting as the high energy intermediate is (A) ATP (B) UTP (C) UDPG (D) CMP

Description : The pyrimidine nucleotide acting as the high energy intermediate is (A) ATP (B) UTP (C) UDPG (D) CMP

Last Answer : Answer : C

Standard free energy (∆G°) of hydrolysis of ATP to ADP + Pi is (A) –49.3 KJ/mol (B) –4.93 KJ/mol (C) –30.5 KJ/mol (D) –20.9 KJ/mol

Description : Standard free energy (∆G°) of hydrolysis of ATP to ADP + Pi is (A) –49.3 KJ/mol (B) –4.93 KJ/mol (C) –30.5 KJ/mol (D) –20.9 KJ/mol

Last Answer : Answer : C

When ATP forms AMP (A) Inorganic pyrophosphate is produced (B) Inorganic phosphorous is produced (C) Phsophagen is produced (D) No energy is produced

Description : When ATP forms AMP (A) Inorganic pyrophosphate is produced (B) Inorganic phosphorous is produced (C) Phsophagen is produced (D) No energy is produced

Last Answer : Answer : A

If glucose-1-phosphate formed by glycogenoloysis in muscles is oxidized to CO2 and H2O, the energy yield will be (A) 2 ATP equivalents (B) 3 ATP equivalents (C) 4 ATP equivalents (D) 8 ATP equivalents

Description : If glucose-1-phosphate formed by glycogenoloysis in muscles is oxidized to CO2 and H2O, the energy yield will be (A) 2 ATP equivalents (B) 3 ATP equivalents (C) 4 ATP equivalents (D) 8 ATP equivalents

Last Answer : Answer : B

In anaerobic glycolysis, energy yield from each molecule of glucose is (A) 2 ATP equivalents (B) 8 ATP equivalents (C) 30 ATP equivalents(D) 38 ATP equivalents

Description : In anaerobic glycolysis, energy yield from each molecule of glucose is (A) 2 ATP equivalents (B) 8 ATP equivalents (C) 30 ATP equivalents(D) 38 ATP equivalents

Last Answer : Answer : A

Given that the standard free energy change (∆G°) for the hydrolysis of ATP is –7.3 K cal/mol and that for the hydrolysis of Glucose 6-phosphate is –3.3 Kcal/mol, the ∆G° for the phosphorylation of glucose is Glucose + ATP → Glucose 6– Phosphate + ADP. (A) –10.6 Kcal/mol (B) –7.3 Kcal/mol (C) –4.0 Kcal/mol (D) +4.0 Kcal/mol

Description : Given that the standard free energy change (∆G°) for the hydrolysis of ATP is -7.3 K cal/mol and that for the hydrolysis of Glucose 6-phosphate is -3.3 Kcal/mol, the ∆G° for the phosphorylation of glucose is Glucose + ATP → ... -10.6 Kcal/mol (B) -7.3 Kcal/mol (C) -4.0 Kcal/mol (D) +4.0 Kcal/mol

Last Answer : Answer : C

The energy yield from complete oxidation of products generated by second reaction cycle of β-oxidation of palmitoyl CoA will be (A) 5 ATP (B) 12 ATP (C) 17 ATP (D) 34 ATP

Description : The energy yield from complete oxidation of products generated by second reaction cycle of β-oxidation of palmitoyl CoA will be (A) 5 ATP (B) 12 ATP (C) 17 ATP (D) 34 ATP

Last Answer : Answer : D

1 molecule of palmitic acid on total oxidation to CO2 will yield molecules of ATP (as high energy bonds): (A) 129 (B) 154 (C) 83 (D) 25

Description : 1 molecule of palmitic acid on total oxidation to CO2 will yield molecules of ATP (as high energy bonds): (A) 129 (B) 154 (C) 83 (D) 25

Last Answer : Answer : A

Net energy generation on complete oxidation of linoleic acid is (A) 148 ATP equivalents (B) 146 ATP equivalents (C) 144 ATP equivalents (D) 142 ATP equivalents

Description : Net energy generation on complete oxidation of linoleic acid is (A) 148 ATP equivalents (B) 146 ATP equivalents (C) 144 ATP equivalents (D) 142 ATP equivalents

Last Answer : Answer : D

Net generation of energy on complete oxidation of palmitic acid is (A) 129 ATP equivalents (B) 131 ATP equivalents (C) 146 ATP equivalents (D) 148 ATP equivalents

Description : Net generation of energy on complete oxidation of palmitic acid is (A) 129 ATP equivalents (B) 131 ATP equivalents (C) 146 ATP equivalents (D) 148 ATP equivalents

Last Answer : Answer : D

Sufficient energy required to produce 3 ATP from 3 ADP and 3 pi is (A) –21,900 cal (B) 29,900 cal (C) 31,900 cal (D) 39,900 cal

Description : Sufficient energy required to produce 3 ATP from 3 ADP and 3 pi is (A) –21,900 cal (B) 29,900 cal (C) 31,900 cal (D) 39,900 cal

Last Answer : A