1. The Biuret test is used to test for the presence of an amino acid. a. True b.
ID: 708769 • Letter: 1
Question
1. The Biuret test is used to test for the presence of an amino acid.
a. True
b. False
2. The Biuret test is used to test for the presence of an amino acid.
a. -1
b. 0
c. +1
3. What is the overall (net) charge on an amino acid at a pH higher than its isoelectric point (pI)?
a. -1
b. 0
c. +1
4. What is the overall (net) charge on an amino acid at a pH lower than its isoelectric point (pI)?
a. -1
b 0
c. +1
5. Amino acids are biochemical compounds which contain both an amine group and a carboxylic acid group.
a. True
b. False
6. All amino acids are soluble in water, and they have very high melting points.
a. True
b. False
7. Amino acids are most water-soluble at their isoelectric point.
a. True
b. False
8. Casein can be isolated from milk by bringing it to its isoelectric point.
a. true
b. False
9. Albumin is a protein. Do you expect a solution of albumin to be able to neutralize a small amount of acid?
a. Yes, because albumin can function as a base.
b. Yes, because albumin can function as an acid.
c. No, because albumin cannot function as a base.
d. No, because albumin cannot function as an acid
10. Biuret reagent is used to confirm the presence of protein. Which of the following do you expect to give a positive Biuret test?
a. Deionized water
b. Glutamic acid (an amino acid)
c. Casein
d. More than one of these will give a positive Biuret test.
Explanation / Answer
1) a, 3) a, 4) c, 5) a, 6) a, 7) b, 8)a, 9) a, 10) c
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