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Q.56 The empirical formula for biomass of an unknown organism is CH1.8O0.5N0.2. To grow this organism, ethanol (C2H5OH) and ammonia are used as carbon and nitrogen sources, respectively. Assume no […]

Q.55 Analysis of a hexapeptide using enzymatic cleavage reveals the following result: Amino acid composition of the peptide is: 2R, A, V, S, Y Trypsin digestion yields two fragments and […]

Q.54 The activity of lactate dehydrogenase can be measured by monitoring the following reaction: Pyruvate + NADH  →  Lactate + NAD+ The molar extinction coefficient of NADH at 340 nm […]

Q.53 The molar extinction coefficients of Trp and Tyr at 280 nm are 5690 M−1·cm−1 and 1280 M−1·cm−1, respectively. The polypeptide chain of yeast alcohol dehydrogenase(37 kDa) contains5 Trp and […]

Q.52 In an assay of the type II dehydroquinase of molecular mass 18 kDa, it is found that the Vmax of the enzyme is 0.0134 μmol·min−1 when 1.8 μg enzyme […]

Q.51 Choose the CORRECT combination of True (T) and False (F) statements about microcarriers usedin animal cell culture.P. Higher cell densities can be achieved using microcarriersQ. Microcarriers increase the surface […]

Q.50 In animal cell culture, a CO2 enriched atmosphere in the incubator chamber is used to maintain theculture pH between 6.9 and 7.4. Which one of the following statements is […]

Q.49 Which one of the following statements regarding G proteins is INCORRECT?(A) GDP is bound to G protein in the resting stage(B) GTP bound α subunit cannot reassemble with βγ dimer(C) All […]

Q.48 Which of the following statement(s) is/are CORRECT for antigen activated effector T cells?P. CD4+ cells make contact with macrophages and stimulate their microbicidal activityQ. CD4 + cells make contact […]

Q.47 Find the INCORRECT combination.(A) Surface immunoglobulins ̶ B cell antigen receptor(B) Affinity maturation ̶ isotype switching(C) Fc region of antibodies ̶ binding to complement proteins(D) Spleen, the secondary lymphoid […]