Question

1) The beta-pleated sheet is an example of 

A) primary structure B) secondary structure. tertiary structure. D) quaternary structure. E) none of the above 

2) Which type of interaction is not directly involved in maintaining tertiary structure? 

A) disulfide bridges B) peptide bonds salt bridges D) hydrogen bonding E) hydrophobic interactions  

3) How many different tripeptides can be formed from one molecule each of the amino acids tyrosine, valine, and alanine? 

A) 12 B) 3 24 D) 9 E) 6 

4) Which pair of amino acids can have ionic interactions? 

A) arginine and glutamic acid B) asparagine and lysine leucine and alanine D) glutamic acid and serine E) glycine and asparagine 

5) The isoelectric point of an amino acid is the pH 

A) at which it exists in the zwitterion form B) at which it exists in the basic form. equal to its pka D) at which it exists in the acid form. E) equal to its pkb 

6) In the tetrapeptide Ala-Cys-Val-Leu, the N-terminal amino acid is 

A) Ala. B) Cys. Val D) Leu. E) none of the above 

7) Amino acids are least soluble in water at 

A) low pH B) high pH. C) their is electric point. D) neutral pH. E)both high and low pH

Answer 1