a) Will always have an equal percentage of A and G, and an equal percentage of C and T:
(A) DNA
(B) mRNA
(C) tRNA
(D) More than one of the above
(E) None of the above

b) Has an anticodon and carries an amino acid:(A) DNA (B) mRNA (C) tRNA (D) More than one of the above (E) None of the above

c) Serves as a messenger for taking genetic information from the nucleus to the cytoplasm: (A) DNA (B) mRNA (C) tRNA (D) More than one of the above (E) None of the above

d) Involved in the process of translation:(A) DNA (B) mRNA (C) tRNA (D) More than one of the above (E) None of the above

e) Partially unzips/unwinds during the process of transcription: (A) DNA (B) mRNA (C) tRNA (D) More than one of the above (E) None of the above

1. When two carbohydrates are epimers: (A) one is a pyranose, the other a furanose. (B) one is an aldose, the other a ketose. (C) one is α conformation, the other in β conformation. (D) they differ only in the configuration around one carbon atom. (E) they rotate plane-polarized light in the same direction.

2. Isomers of sugar in which the position of ketone and aldehyde groups have been changed are called: (A) anomers. (B) diastereoisomers. (C) enantiomers. (D) epimers. (E) None of the above.

3. Chitin and agarose are (A) polysaccharides. (B) polypeptides. (C) polynucleotides. (D) lipids. (E) enzymes.

4. Which of the following is true about glycoprotein? (A) They can act in cell-cell recognition. (B) They can be found on the outer face of the cell membrane only. (C) O-liked oligosaccharides is attached to the amide nitrogen of an Asn residue. (D) A、B、C (E) A、B

5. Glycolysis is enhanced by (A) glucose-1-phosphate, (B) fructose-1,6-bisphosphate, (C) fructose-2,6-bisphosphate, (D) glucose-6-phosphate and fructose-1,6-bisphosphate, (E) fructose-1,6-bisphosphate and fructose-2,6-bisphosphate.

6. When a muscle is stimulated to contract aerobically, less lactic acid is formed than when it contracts anaerobically because: (A) glycolysis does not occur to significant extent under aerobic conditions. (B) muscle is metabolically less active under aerobic than anaerobic conditions. (C) the lactic acid generated is rapidly incorporated into lipids under aerobic conditions. (D) under aerobic conditions in muscle, the major energy-yielding pathway is the pentose phosphate pathway, which does not produce lactate. (E) under aerobic conditions, most of the pyruvate generated as a result of glycolysis is oxidized by the citric acid cycle rather than reduced to lactate.

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