Question 13 (2 points): Which of the following are possible base compositions fo

Question

Question 13 (2 points): Which of the following are possible base compositions for a single-stranded RNA? A. 35 10 30 0 25 B. 10 40 40 0 10 C. 35 35 15 0 15 D. All of the above E. None of the above Question 14 (2 points): Which of the following statements would NOT correctly describe lipids? A. Composed primarily of carbon and hydrogen. B. Include both charged and neutral compounds. C. Large molecules with molecular weight>5,000 Da. D. Poor solubility in water and good solubility in nonpolar solvents. E. Nonpolar or amphipathic compounds Question 15 (2 points): When a bacterium such as E. coli is shifted from a warmer growth temperature to a cooler growth temperature, it compensates by: A. Synthesizing thicker membranes to insulate the cell from the cold environment B. Increasing its metabolic rate to generate more heat C. Putting longer-chain saturated fatty acids into its membranes D. Shifting from aerobic to anaerobic metabolism E. Putting more unsaturated fatty acids into its membranes

Explanation / Answer

13. Since, RNA does not contain thymine and does not follow Chargaff rule, hence, the composition of single stranded RNA can be all the above option. Hence, option “D” is correct.

14. Lipids are primarily composed of hydrogen, oxygen and carbon. Lipids have molecular weight in the range of 100- 5000 Da. Lipids consist of charged compounds. Hence, the option incorrect are A,B,C.

15. E.coli compoenste the temperature by putting more unsaturated fatty acids into its membranes. Hence, option “E” is correct.

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