CSIR JRF/NET Life Science Exam December 2017 (II)
Model Question Paper 4/5
(CSIR MCQ015: Practice Questions with Answer Key)
(1). In an experimental approach, the trp operon and lac operon were fused. Under what condition there would be the expression of β‐galactosidase occurs.
a. Low lactose and glucose
b. High lactose and glucose
c. Low tryptophan
d. High tryptophan
(2). Which antibiotic is responsible for premature termination of translation in bacteria?
(3). In an m‐RNA, immature termination occurs from the codon UAA. Which of the following transition mutation will lead to its reversal
a. Change at first U
b. Change at first A
c. Change at second A
d. All of the above
(4). Which of the following enzyme of nitrogen metabolism is located in plastid?
a. Nitrate reductase
b. Nitrite reductase
c. Aspartate synthetase