Biochem Luo Quiz 1

1. Alcohol can be easily dissolved by water because:
a. water is a weak acid.
b. water molecules can form hydrogen bond with hydroxyl group.
c. water has higher density as liquid than as solid (ice).
d. water molecules can ionize in the presence of alcohol.

2. Which residue can form a salt bridge with glutamate?
a. Lys
b. Tyr
c. Gln
d. Asn
e. Asp

3. The following amino acid is:




a. serine
b. threonine
c. tyrosine
d. cysteine
e. methionine

4. The pH of a solution is 8. A 10-fold (i.e. 10 times) decrease in the concentration of H+ would
result in a pH of:
a. 18
b. 10
c. 9
d. 7
e. 6

5. Water has all the following properties EXCEPT:
a. Water has very high tendency to ionize
b. Water has higher density as a liquid than as a solid
c. Water is a liquid in the biological range of temperatures
d. Water is a very good solvent for polar solutes
e. It has potential to form hydrogen bonds

6. The functional group in an aldehyde is called:
a. hydroxyl
b. carboxyl
c. carbonyl
d. acyl
e. amino


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