KVPY Government Jobs Exams

E.coli about to replicate was pulsed with tritiated thymidine for 5 min and then transferred to normal medium. After one cell division which one of the following observations would be correct ?
(A) both the strands of DNA will be radioactive (B) one strand of DNA will be radioactive
(C) none of the strands will be radioactive (D) half of one strand of DNA will be radioactive

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KVPY Other Question
Although blood flows through large arteries at high pressure, when the blood reaches small capillaries the
pressure decreases because-
(A) the valves in the arteries regulate the rate of blood flow into the capillaries
(B) the volume of blood in the capillaries is much lesser than that in the arteries
(C) the total cross-sectional area of capillaries arising from an artery is much greater than that of the artery
(D) elastin fibers in the capillaries help to reduce the arterial pressure Selection of lysine auxotroph (bacteria which requires lysine for growth) from a mixed population of bacteria
can be done by growing the bacterial population in the presence of-
(A) lysine (B) penicillin (C) lysine and penicillin (D) glucose