Biochemistry PYQs – Set 2

By Atul Sahu • Biochemistry, Subject Wise PYQs

Biochemistry PYQs – Set 2

Subject : Biochemistry

21. SDS is used in PAGE for efficient separation of proteins because it

Biochemistry • Complete Subject • GPAT 2017

A. Imparts a uniform charge density on proteins B. Stabilizes the proteins C. Decreases the surface tension of the buffer D. Solubilizes the proteins

22. In humans, the end product of purine catabolism is

Biochemistry • Complete Subject • GPAT 2017

A. Uric acid B. Urea C. Purine oxide D. Xanthine

23. Oral rehydration salts contain ionic electrolytes in concentrations (mmol/L) of approximately

Biochemistry • Electrolyte Balance & Transport • GPAT 2017

A. Na⁺ 20, K⁺ 10 B. Na⁺ 40, K⁺ 20 C. Na⁺ 53, K⁺ 40 D. Na⁺ 60, K⁺ 20

24. Which enzyme is used to synthesize optically active mandelic acid from benzaldehyde?

Biochemistry • Enzymatic Reactions • GPAT 2017

A. Invertin B. Myrosin C. Emulsin D. Zymase

25. How do enzymes accelerate reaction rates?

Biochemistry • Enzyme Kinetics • GPAT 2017

A. Lower activation energy B. Denature substrates C. Increase temperature D. Change pH

26. How many isoforms does nitric oxide synthase have?

Biochemistry • Enzymes & Coenzymes • GPAT 2017

A. Two B. Three C. Four D. Five

27. Which enzyme is used by HIV to form DNA in the host cell?

Biochemistry • Enzymes and Coenzymes • GPAT 2017

A. Restriction endonuclease B. DNA-directed polymerase only C. Reverse transcriptase only D. Both (b) and (c)

28. Cyclic AMP (cAMP) is an important second messenger. Which enzyme catalyzes its generation after a receptor-ligand interaction?

Biochemistry • Enzymes and Coenzymes • GPAT 2017

A. Protein kinase A B. cAMP phosphodiesterase C. Guanylyl cyclase D. Adenylate cyclase

29. Thiamine deficiency causes decreased energy production because

Biochemistry • Enzymes and Coenzymes • GPAT 2017

A. It is required for transamination B. It is a co-factor in oxidative reduction C. It is a coenzyme for transketolase in the pentose phosphate pathway D. It is a coenzyme for pyruvate dehydrogenase & α-ketoglutarate dehydrogenase

30. Match the following enzymes/proteins with specific functions in DNA replication: 1. Helicases, 2. DNA Primase, 3. DNA Ligases, 4. Topoisomerases

Biochemistry • Enzymes and Coenzymes • GPAT 2017

A. (a) 1-P, 2-Q, 3-R, 4-S B. (b) 1-P, 2-S, 3-Q, 4-R C. (c) 1-S, 2-Q, 3-P, 4-R D. (d) 1-P, 2-Q, 3-R, 4-S

31. Which of the reactive oxygen species is most dangerous to cells?

Biochemistry • Enzymes and Coenzymes • GPAT 2017

A. Singlet oxygen B. Hydroxyl radical C. Superoxide D. Peroxide

32. Thiamine deficiency causes decreased energy production because

Biochemistry • Enzymes and Coenzymes • GPAT 2017

A. It is required for transamination B. It is a co-factor in oxidative reduction C. It is a coenzyme for transketolase in the pentose phosphate pathway D. It is a coenzyme for pyruvate dehydrogenase & α-ketoglutarate dehydrogenase

33. Beta oxidation of fatty acids takes place in

Biochemistry • Enzymes and Coenzymes • GPAT 2017

A. Mitochondria B. Cytoplasm C. Nucleus D. Chloroplast

34. In DNA replication, the newly added nucleotide is joined to the growing DNA strand by which enzyme

Biochemistry • Enzymes and Coenzymes • GPAT 2017

A. DNA polymerase B. DNA ligase C. Restriction endonuclease D. Reverse transcriptase

35. Which of the following is a characteristic of cytochrome P‑450

Biochemistry • Enzymes and Coenzymes • GPAT 2017

A. Catalyzes aromatic and aliphatic hydroxylations B. Located in the lipophilic environment of mitochondrial membrane C. Catalyzes O-, S-, N‑methylation reactions D. Catalyzes conjugation reactions

36. The role of glutathione in tissues includes all except:-

Biochemistry • Enzymes and Coenzymes • GPAT 2017

A. Participate in decomposition of hydrogen peroxide B. Participate in activation of methionine C. Participate in detoxification reactions D. Biologically active in oxidized form

37. Match List I with List II. List I: A. Riboflavin B. Niacin C. Thiamine D : Pantothenic aciD : List II: I. Electron acceptor for isocitrate dehydrogenase II. Decarboxylation of α‑ketoglutarate dehydrogenase III. Part of coenzyme A IV. Cofactor for succinate dehydrogenase V. Enzyme activity regulator. Choose the correct matching.

Biochemistry • Enzymes and Coenzymes • GPAT 2017

A. A–IV, B–I, C–II, D–III B. A–III, B–II, C–IV, D–V C. A–I, B–III, C–IV, D–II D. A–II, B–V, C–I, D–IV

38. Which protein marker can be detected within three hours of acute ischemic kidney injury in urine?

Biochemistry • Enzymes and Coenzymes • GPAT 2017

A. N-acetyl-β-D-glucosaminidase B. Glutathione-S-transferase C. Neutrophil gelatinase associated lipocalin D. γ-glutamyl transpeptidase

39. In Michaelis-Menten equation when Km = C:

Biochemistry • Enzymes and Coenzymes • GPAT 2017

A. Indicates zero-order process B. The rate process occurs at a constant rate C. Equation becomes identical to first order elimination of drug D. The rate of process is equal to half of maximum rate

40. If two monosaccharides differ in structure around a single carbon atom, they are called

Biochemistry • Epimers • GPAT 2017

A. Epimers B. Dimers C. Trioses D. Trimers

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