NR 442 COMMUNITY HEALTH EXAM 2 QUESTION MOST TESTED QUESTIONS AND ANSWERS GRADED A+ WITH RATIONALES

ESTUDYR


NR 442 COMMUNITY HEALTH EXAM 2 QUESTION MOST TESTED
QUESTIONS AND ANSWERS GRADED A+ WITH RATIONALES

1. Glycine is classified as which type of amino acid?
A. Polar
B. Nonpolar
C. Basic
D. Acidic

Rationale: Glycine has a small hydrogen side chain, making it hydrophobic and nonpolar.



2. What is the correct structural representation of glycine at physiological pH?
A. COOH–H–C–H–NH₂
B. COO⁻–H–C–H–NH₃⁺
C. COO⁻–H–C–CH₃–NH₃⁺
D. COOH–H–C–CH₃–NH₂

Rationale: At pH 7.4, glycine exists as a zwitterion with a deprotonated carboxyl group (COO⁻) and a
protonated amino group (NH₃⁺).



3. What is the three-letter abbreviation for glycine?
A. Gly
B. Ala
C. Val
D. Leu

Rationale: Gly is the standard three-letter abbreviation for glycine.



4. What is the one-letter code for glycine?
A. A
B. V
C. G
D. L

Rationale: G is the one-letter code for glycine.

, ESTUDYR


5. Alanine is classified as which type of amino acid?
A. Polar
B. Nonpolar
C. Basic
D. Acidic

Rationale: Alanine has a methyl side chain, making it hydrophobic and nonpolar.



6. What is the correct structural representation of alanine at physiological pH?
A. COOH–H–C–CH₃–NH₂
B. COO⁻–H–C–CH₃–NH₃⁺
C. COO⁻–H–C–H–NH₃⁺
D. COOH–H–C–H–NH₂

Rationale: Like glycine, alanine at pH 7.4 is a zwitterion with COO⁻ and NH₃⁺ groups.



7. What is the three-letter abbreviation for alanine?
A. Gly
B. Ala
C. Val
D. Leu

Rationale: Ala is the standard three-letter abbreviation for alanine.



8. What is the one-letter code for alanine?
A. A
B. V
C. G
D. L

Rationale: A is the one-letter code for alanine.



9. Valine is classified as which type of amino acid?
A. Polar
B. Nonpolar
C. Basic
D. Acidic