ESTUDYR
UCLA BIOCHEM 153A QUIZ #2 UPDATED EXAM WITH MOST
TESTED QUESTIONS AND ANSWERS | GRADED A+ | ASSURED
SUCCESS WITH DETAILED RATIONALES
1. Which of the following best describes a carbohydrate made up of 3 carbons?
A. Pentose
B. Hexose
C. Triose
D. Heptose
Rationale: The prefix “tri-” indicates 3 carbons, making the carbohydrate a triose. Pentose has 5
carbons, hexose 6, and heptose 7.
2. A carbohydrate made up of a single sugar residue is called a:
A. Disaccharide
B. Monosaccharide
C. Oligosaccharide
D. Polysaccharide
Rationale: Monosaccharides are the simplest carbohydrates consisting of a single sugar unit.
Disaccharides have two units, oligosaccharides have 3–10, and polysaccharides have more than
10.
3. Which carbohydrate is made up of exactly two sugar residues?
A. Disaccharide
B. Monosaccharide
C. Oligosaccharide
D. Polysaccharide
Rationale: Disaccharides are formed from the condensation of two monosaccharides.
4. A carbohydrate made up of 3–10 sugar residues is called a:
, ESTUDYR
A. Monosaccharide
B. Disaccharide
C. Oligosaccharide
D. Polysaccharide
Rationale: Oligosaccharides contain a few sugar units, typically between 3 and 10.
5. A carbohydrate made up of more than 10 sugar residues is called a:
A. Monosaccharide
B. Disaccharide
C. Oligosaccharide
D. Polysaccharide
Rationale: Polysaccharides are long chains of monosaccharide units, often hundreds or
thousands.
6. Which type of carbohydrate has an aldehyde as its carbonyl group?
A. Aldose
B. Ketose
C. Triose
D. Pentose
Rationale: Aldoses contain an aldehyde group (-CHO), whereas ketoses contain a ketone group
(C=O).
7. Which type of carbohydrate has a ketone as its carbonyl group?
A. Aldose
B. Ketose
C. Triose
D. Hexose
Rationale: Ketoses have a ketone group at the carbonyl position, unlike aldoses.
UCLA BIOCHEM 153A QUIZ #2 UPDATED EXAM WITH MOST
TESTED QUESTIONS AND ANSWERS | GRADED A+ | ASSURED
SUCCESS WITH DETAILED RATIONALES
1. Which of the following best describes a carbohydrate made up of 3 carbons?
A. Pentose
B. Hexose
C. Triose
D. Heptose
Rationale: The prefix “tri-” indicates 3 carbons, making the carbohydrate a triose. Pentose has 5
carbons, hexose 6, and heptose 7.
2. A carbohydrate made up of a single sugar residue is called a:
A. Disaccharide
B. Monosaccharide
C. Oligosaccharide
D. Polysaccharide
Rationale: Monosaccharides are the simplest carbohydrates consisting of a single sugar unit.
Disaccharides have two units, oligosaccharides have 3–10, and polysaccharides have more than
10.
3. Which carbohydrate is made up of exactly two sugar residues?
A. Disaccharide
B. Monosaccharide
C. Oligosaccharide
D. Polysaccharide
Rationale: Disaccharides are formed from the condensation of two monosaccharides.
4. A carbohydrate made up of 3–10 sugar residues is called a:
, ESTUDYR
A. Monosaccharide
B. Disaccharide
C. Oligosaccharide
D. Polysaccharide
Rationale: Oligosaccharides contain a few sugar units, typically between 3 and 10.
5. A carbohydrate made up of more than 10 sugar residues is called a:
A. Monosaccharide
B. Disaccharide
C. Oligosaccharide
D. Polysaccharide
Rationale: Polysaccharides are long chains of monosaccharide units, often hundreds or
thousands.
6. Which type of carbohydrate has an aldehyde as its carbonyl group?
A. Aldose
B. Ketose
C. Triose
D. Pentose
Rationale: Aldoses contain an aldehyde group (-CHO), whereas ketoses contain a ketone group
(C=O).
7. Which type of carbohydrate has a ketone as its carbonyl group?
A. Aldose
B. Ketose
C. Triose
D. Hexose
Rationale: Ketoses have a ketone group at the carbonyl position, unlike aldoses.
