Tag: TIFR Previous Year Question Papers Biology PYQ With Answer Key Download

1. In 1828, Wohler synthesized urea in the laboratory. This was significant because it demonstrated that: a. biomolecules are carbon compounds b. urea would be an ideal fertilizer c. organic […]

15. Rank the following ideas/discoveries from oldest to most recent. (I) DNA is the molecule responsible for heredity (II) Living things best suited to their environment are more likely to […]

14. Despite humans having a highly evolved immune system, pathogens are able to evade the immune system using various strategies. Which of the following immune evasion strategies cannot be employed […]

13. Rifampicin, an inhibitor of RNA polymerase, is added to a bacterial culture. The culture is immediately divided into three fractions, to which radioactive thymine or uracil or methionine are […]

12. Which of the following mRNA molecules would form the most stable stem-loop structure? a. 5’…GGCUU……UUCGG…3′ b. 5’…GGCUU……AAGCC…3′ c. 5’…GGCUU……GGCUU…3′ d. 5’…GGCUU……CCGAA…3′ Most Stable mRNA Stem-Loop: CSIR NET Question Solved […]

11. When HeLa cells were treated with the growth factor TGF-β for 30 minutes, levels of E-Cadherin protein were reduced. mRNA levels of the E-Cadherin gene (CDH1) did not show […]

10. N-linked glycosylation in proteins of eukaryotes is initiated in the: a. lumen of the endoplasmic reticulum b. lumen of the Golgi apparatus c. inside the nucleus d. within endosomes […]

9. Mitochondria isolated and placed in a buffered solution with a low pH start to produce ATP. This is likely due to: a. lower pH inside mitochondria b. increased OH- […]

8. The Asian mongoose and the American skunk evolved independently of each other, but show similar structures and features, for e.g., ability to spray their attacker with musk. The similarities […]

7. You transcribe mRNA from a DNA sample and purify it. You then separate the two strands of the DNA and analyse the base composition of each strand and of […]