Biotechnology

25. The protein in eukaryotes which is subjected to degradation undergoes: (A) phosphorylation (B) carboxylation (C) ubiquitylation (D) methylation

Match the viruses in Group I with their host cell receptors in Group II: Group I P. Hepatitis A virus Q. Human immunodeficiency virus R. Rabies virus Group II 1. Heparan sulphate 2. Acetylcholine receptor 3. CD4 protein 4. Alpha-2 macroglobulin Options: (A) P-1, Q-3, R-2, S-4 (B) P-3, Q-4, R-1, S-2 (C) P-4, Q-3, … Read more

Match the microbial growth characteristics in Group I with the corresponding features in Group II: Group I P. Growth associated product formation Q. Non growth associated product formation R. Product inhibition S. Substrate inhibition Group II 1. Specific growth rate decreases with increasing product concentration 2. Specific product formation rate is constant 3. Specific product … Read more

Match the items in Group I with Group II: Group I P. Circular dichroism Q. X-ray crystallography R. Freeze-drying S. Ultracentrifugation Group II 1. Concentration 2. Sedimentation coefficient 3. Secondary structure determination 4. Tertiary structure determination Options: (A) P-4, Q-1, R-2, S-3 (B) P-1, Q-4, R-3, S-2 (C) P-2, Q-3, R-4, S-1 (D) P-3, Q-4, … Read more

Match the products in Group I with their respective organisms in Group II: Group I P. Glycerol Q. Glutamic acid R. Curdlan S. Amphotericin B Group II 1. Corynebacterium glutamicum 2. Alcaligenes faecalis 3. Dunaliella salina 4. Streptomyces nodosus Options: (A) P-2, Q-1, R-3, S-4 (B) P-4, Q-2, R-1, S-3 (C) P-3, Q-1, R-2, S-4 … Read more

Determine the correctness or otherwise of the following Assertion (a) and the Reason (r): Assertion: IgM is found in serum as a pentameric protein consisting of five IgM monomers. Reason: The pentameric form of IgM is due to cross-linking of IgM monomers via peptide bond. Options: (A) both (a) and (r) are true and (r) … Read more

Determine the correctness or otherwise of the following Assertion (a) and the Reason (r): Assertion: N-methyl-N’-nitro-N-nitrosoguanidine (NTG) is an effective chemical mutagen. Reason: Mutations induced by NTG mainly are GC → AT transitions. Options: (A) both (a) and (r) are true and (r) is the correct reason for (a) (B) both (a) and (r) are … Read more

Determine the correctness of the following statements: I. Enhancer sequences are those DNA sequences that are involved in increasing the rate of DNA replication. II. Enhancer sequences work by binding with eukaryotic gene activator factors. Options: (A) only I is true (B) only II is true (C) both I and II are true (D) both … Read more

In a well-aerated and agitated microbial culture, the ‘supply’ of oxygen is equal to demand: C = instantaneous value of dissolved oxygen concentration T = specific oxygen uptake rate per unit weight of cells X = dry weight of the cells per unit volume Options: (A) (r X) / (C*- C) (B) (r) / X … Read more

23. Diphtheria toxin, tetracycline and streptomycin inhibit: (A) DNA repair (B) DNA replication (C) transcription (D) translation