28. What is the committed step in fatty acid synthesis?
(A) Binding of the fatty acyl group to the acyl carrier protein
(B) Synthesis of malonyl CoA
(C) Transacylase reaction
(D) The formation of acetoacetyl-AСР

(E) None of the above

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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