KVPY Government Jobs Exams

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

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KVPY Other Question
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 Increasing the number of measurements of an experimental variable will-
(A) increase the standard error of the sample (B) increase the mean of the sample
(C) decrease the standard error of the sample (D) result in all of the above