17) If an atom of sulfur (atomic number 16) were allowed to react with atoms of

Question

17) If an atom of sulfur (atomic number 16) were allowed to react with atoms of hydrogen (atomic 17) number 1), which of the following molecules would be formed? A)H-S-H B)S-H C) D)H-S-H E) H-S-H H-S-H 18) Which of the following are nitrogenous bases of the purine type? 18) A) thymine and uracil B) guanine and adenine C) cytosine and guanine D) adenine and thymine E) uracil and cytosine 19) The difference between the sugar in DNA and the sugar in RNA is that the sugar in DNA A) is in the a configuration and the sugar in RNA is in the configuration. B) is an aldehyde sugar and the sugar in the RNA is a keto sugar. C) can form a double-stranded molecule. D) contains one less oxygen atom E) is a six-carbon sugar and the sugar in RNA is a five-carbon sugar. 20) Which of the following pairs of base sequences could form a short stretch of a normat double helix of DNA? A) 5-purine-pyrimidine-purine-pyrimidine-3 with 3-purine pyrimidine-purine-pyrimidine-s B) 5-G-C-G-C-3' with 5-T-A-T-A-3 C)5-A-G-CT-3 with S-T-CGA-3 D) 5-A-TG-C-3 with 5-G-C-A-T-3 E) All of these pairs are correct. 21) The structural level of a protein leastaffected by a disruption in hydrogen bonding is the 21) A) quaternary level. B) secondary level. C) tertiary level. D) primary level. E) All structural levels are equally affected. 22) A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This 22) DNA molecule could be composed of A) 120 guanine and 120 thymine molecules. B) 120 adenine and 120 uracil molecules. C) 120 thymine and 120 adenine molecules. D) 120 adenine and 120 cytosine molecules. E) 120 cytosine and 120 thymine molecules.

Explanation / Answer

17) SH2 (H-S-H)

18) B : Guanine and adenine which are 9 membered ring and are purines

19) C : ribose has 2'OH whereas an OH group is absent from C-2 in Deoxyriose

20) D: 5'ATGC'3 and 5'GCAT'3

5'ATGC'3

3'TACG'5

A basepairs with T whereas G basepairs with C

21. Primary level because the primary sequence is just the amino acid sequence of the polypeptide sequence and thus there is no bonding involved in the primary level.

22. C, Adenine and thymine base pair,

A base pairs with T

C with G

Uracil with A but in RNA; Uracil exists in place of Thymine (T) in RNA

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