20. Which of the following amino acid residue is required for heme biosynthesis?
(A) Ser
(B) Cys
(C) Gly
(D) Trp
(E) Glu

1. Which of the following formulas would be a carbohydrate?(A) (B) C4H8O6 (C) (D) C3H8O3 (E)

2. Fatty acids are ______ meaning that they have both a hydrophobic and hydrophilic region of the molecule.(A) aliphatic (B) amphipathic (C) saturated (D) unsaturated (E) phosphorylated

3. Which ofthe following polysaccharides contains exclusively glucose in β(1→4) glycosidic bonds?(A) Amylose (B) Amylopectin (C) Glycogen (D) Cellulose (E) Chitin

4. An N-linked glycan would be attached to ______ while an O-linked glycan would be attached to ______.(A) Asn; Ser (B) Lys; Tyr (C) Gln; Thr (D) Arg; Ser (E) Lys; Ser

5. Which of the following would most likely move across a membrane by simple diffusion?(A) Potassium ions (B) Glucose (C) Carbon dioxide(D) Sodium ions (E) Water

6. A ceramide is derived from which combination of the following?(A) A molecule of sphingosine and a monosaccharide(B) A molecule of sphingosine and a molecule of phosphocholine(C) A molecule of sphingosine and a fatty acid(D) A molecule of sphingosine and two fatty acids(E) A molecule of sphingosine, a fatty acid and a monosaccharide

7. DNA double helix structure is stabilized by all of the following EХСЕРТ:(A) the sugar-phosphate backbones are oriented in opposite directions.(B) the glycosidic bonds holding paired bases are directly across the helix from one another.(C) cations such as Mg2+ bind to the anionic phosphates.(D) bases stack together through hydrophobic interactions and van der Waals forces.(E) appropriate base pairing builds a polymer whose external dimensions are uniform.

8. All are characteristics of pyrimidines EXCEPT:(A) six membered ring.(B) heterocyclic.(C) conjugated.(D) fused five membered rings.(E) two nitrogens separated by a carbonyl.

9. Which enzyme catalyzes the primary regulation site of glycolysis?(A) Неxokinase(B) Phosphofructokinase-1(C) Glyceraldehyde-3-phosphate dehydrogenase(D) Phosphoglycerate kinase(E) Pyruvate kinase

10. In aerobic metabolism, ______ is the terminal electron acceptor during cellular oxidation of carbon containing fuels.(A) (B) FAD (C) ATP (D) H2O (E) O2

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