Exam 2 practice problems

The addition of a fatty acid to a sphingosine backbone generates:

• a) Ceramide

• b) Phosphatidylcholine

• c) Cholesterol

• d) Glycerolipid

Which of the following describes the relationship between two complementary strands of DNA?

• a) Both strands run in the same direction, but the base pairs are complementary.

• b) The strands run in opposite directions, and the base pairs form hydrogen bonds.

• c) Both strands are parallel, with identical base sequences.

• d) The strands are antiparallel, and base pairs form covalent bonds.

Which of the following is the correct complementary sequence for the DNA strand 5'-GCATG-3'?

• a) 5'-ATGCA-3'

• b) 3'-CGTAC-5'

• c) 5'-GCTA-3'

• d) 5'-CGTA-3'

Which of the following is true about reducing sugars?

• a) They cannot react with oxidizing agents like Cu+2.

• b) They contain a free aldehyde or ketone group capable of reducing oxidizing agents.

• c) They do not participate in glycosidic bond formation.

• d) They do not contain a free carbonyl group.

Which of the following sugars is a non-reducing sugar?

• a) Sucrose

• b) Maltose

• c) Lactose

• d) Glucose

Which of the following fatty acids would have the highest melting point?

• a) Saturated 18:0 (Stearic acid)

• b) Cis 18:1 (Oleic acid)

• c) Trans 18:1 (Elaidic acid)

• d) Polyunsaturated 18:3 (Linolenic acid)

Which eicosanoid is involved in regulating blood clotting and vasoconstriction?

• a) Prostaglandins

• b) Leukotrienes

• c) Thromboxanes

• d) Prostacyclin

Which of the following describes the structural difference between α- and β-D-glucose?

• a) α-D-glucose has the hydroxyl group on the opposite side of the plane from the CH2OH group, while β-D-glucose has the hydroxyl group on the same side.

• b) α-D-glucose and β-D-glucose are identical in structure but differ only in their configuration at the anomeric carbon.

• c) α-D-glucose has the hydroxyl group on the same side of the plane as the CH2OH group, while β-D-glucose has the hydroxyl group on the opposite side.

• d) α-D-glucose has a ring structure, while β-D-glucose has an open-chain structure.

Which of the following monosaccharides is a structural component of RNA?

• a) D-glucose

• b) D-ribose

• c) L-fucose

• d) D-fructose

In the formation of disaccharides, the bond between the two monosaccharide units is called a:

• a) Phosphodiester bond

• b) Hydrogen bond

• c) Glycosidic bond

• d) Peptide bond