6. Which of the statements about RNA and DNA is false? a RNA has a hydroxyl (OH)

Question

6. Which of the statements about RNA and DNA is false? a RNA has a hydroxyl (OH) group at the 2 position of the sugar while DNA has a hydrogen (H). A is typically single-stranded while DNA is typically double-stranded. c) RNA is produced during transcription of DNA. d) RNA contains thymine and DNA contains uracil. e) None of the above 7. If a double-stranded DNA molecule contains 16% T, how much G does it contain? a) 16% b) 32% c) 34% d) 68% e) None of the above 8. Hydrogen bonds are most important in: a) the primary structure of a protein b) the secondary structure of a protein c) the tertiary structure of a protein d) the quaternary structure of a protein e) none of the above; there are no H-bonds in proteins, peptide bonds only 9. In the trp operon, the trp repressor protein is: a) b) c) d) e) bound to the operator in the presence of tryptophan bound to the operator in the absence of tryptophan activated by cAMP inactivated by tryptophan none of the above 10. Frameshift mutations: a) b) c) d) e) are caused by transversions. are caused by a single nucleotide substitution. change the entire amino acid sequence downstream from the site of an insertion or deletion. have no effect on the amino acid sequence of the resulting polypeptide. None of the above

Explanation / Answer

6d) RNA contains thymine and DNA contains uracil

DNA contain adenine, thymine, guanine and cytosine. Whereas, RNA contains uracil in place if adenine

7. C) 34%

If T= 16%, then A=16%

then A+T= 16+16= 32%

G+C =( 100-32) = 68

as amount of G= amount of C,

then G= 68/2 =34

8.b) the secondary structure of protein

9.a) bound to the operator in presenence of tryptophan

10.c)

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