15 When two amino acids react to form a peptide bond, what new functional group

Question

15 When two amino acids react to form a peptide bond, what new functional group is created? A) an alcohol B) an amine C) an amide D) an ester E) a phosphoester In the peptide Ser-Gly-Asp-Ala, the N-terminal amino acid is A) aspartic acid B) alanine C) cysteine D) serine E) glycine 16 17 What type of interaction would you expect between the following R groups in the tertiary structure of a protein? A) hydrogen bonds B) hydrophobic interactions C) peptide bonds D) disulfide bonds E) salt bridges The a-helix and ?-pleated sheets in proteins are both examples of A) primary structure B) secondary structure C) tertiary structure D) quatemary structure E) both secondary and tertiary structure 18 Which of the following amino acids can form a disulfide bridge? A) glycine B) alanine C) serine D) aspartic acid E) lysine 19 Which side chain would most likely be found in the interior of a protein, away from the aqueous environment? A) -CH2OH B) -CH2SH C) -CH COOH D) -CH2CONH E) 20

Explanation / Answer

15.

B amide

16

D serine

17

B hydrophobic interaction

18

B secondary structure

19

D Aspartic acid

20

E

61

D it is any chemical change or physical change to DNA

62

1 secondary

2 primary

3 quaternary

4 secondary

5 quaternary

6 tertiary

42

nitrogenous base

43

C

44

E

45

E cytocine

46

A hydrogen

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