GATE

Q. Which of the following are true with regard to anaerobic respiration in bacteria? P. The final electron acceptor is an inorganic substance other than molecular oxygen Q. The number of ATP molecules produced per glucose molecule is more than that produced in aerobic respiration R. The number of ATP molecules produced per glucose molecule […]

Q. Which of the following are true about bacterial superoxide dismutase? P. Present in obligate aerobes Q. Present in facultative anaerobes R. Present in aerotolerant anaerobes S. Absent in obligate aerobes (A) P and Q only                       (B) P, Q and R only (C) P and R only                        (D) Q and S only Ans: P, Q

Q. Which one of the following statements is true with regard to processing and presentation of protein antigens? (A) In the class II MHC pathway, protein antigens in the cytosol are processed by proteasomes (B) In the class I MHC pathway, extracellular protein antigens are endocytosed into vesicles and processed (C) In the class I

Q. Which one of the combinations of the following statements is true about antibody structure? P. Limited proteolysis of rabbit IgG with the enzyme pepsin generates two antigen-binding regions (Fab) and an Fc fragment Q. Limited proteolysis of rabbit IgG with the enzyme papain generates a single bivalent antigen-binding region F(ab¢)2 and peptide fragments R.

Q. Determine the correctness or otherwise of the following Assertion [a] and the Reason [r] Assertion: The association constant in water for the G-C base pair is three times lower than that for the A-T base pair. Reason: There are three hydrogen bonds in the G-C base pair and two in the A-T base pair.

Q. Which one of the following amino acids is catalyzed by activated macrophages to produce reactive nitrogen species?               (A) Arginine         (B) Asparagine             (C) Cysteine             (D) Histidine Ans: Arginine

Q. Determine the correctness or otherwise of the following Assertion [a] and the Reason [r] Assertion: Ab initio gene finding algorithms that predict protein coding genes in eukaryotic genomes are not completely accurate. Reason: Eukaryotic splice sites are difficult to predict. (A) Both [a] and [r] are false (B) [a] is true but [r] is

Q. Which of the following cytokines are endogenous pyrogens? P. Tumor necrosis factor-a Q. Interleukin-1 R. Transforming growth factor-β S. Interleukin-10 (A) P and Q only (B) P and R only (C) R and S only (D) Q and S only Ans: P and Q only

Q. In leguminous plants, both the rhizobium genes and the plant genes influence nodulation and nitrogen fixation. Which one of the following functions is NOT encoded by the host plant genes? (A) Production of inducers that modify rhizobial cell wall (B) Production of flavonoid inducers (C) Establishment of contact between bacteria and legume (D) Root

Q. Genomic DNA isolated from a bacterium was digested with a restriction enzyme that recognizes a 6-base pair (bp) sequence. Assuming random distribution of bases, the average length (in bp) of the fragments generated is           Ans: 4096 to 4096