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Welcome to the largest collection of MCQs on the Internet. Access and Discuss these Multiple choice questions for various competitive Exams and Interviews.
1. The α-amino acids have a carboxyl group with a pK around __________ , and an amino group with a pK near __________ .
a. 1.1, and 12.1
b. 6.5, and 8.0
c. 3.3, and 10.5
d. 2.2, and 9.4
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Answer: (d).2.2, and 9.4

2. Coomassie Blue stains the proteins by reacting with
a. arginine residues
b. free c-termini
c. peptide bonds
d. aromatic ring
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Answer: (a).arginine residues

3. Which amino acid when exposed to ninhydrin produces a brown color?
a. Asparagine
b. Proline
c. Alanine
d. Valine
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Answer: (a).Asparagine

4. When the amino acid alanine (R-group is CH₃) is added to a solution with a pH of 7.3, alanine becomes
a. a cation
b. nonpolar
c. a zwitterions
d. an isotope
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Answer: (c).a zwitterions

5. What is the end product of leucine metabolism?
a. Acetyl-CoA
b. Pyruvic acid
c. Oxaloacetic acid
d. Acetyl carnitine
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Answer: (a).Acetyl-CoA

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