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• 30. Which step of polymerase chain reaction (PCR) cycle requires the highest temperature? (A) Anneal
• 31. What is the function of enzymes in a reaction? (A) To stabilize the reaction products (B) To cha
• 2. A major component of RNA but not of DNA is: (A) adenine. (B) cytosine. (C) guanine. (D) thymine.
• 3. In the Watson-Crick model for the DNA double helix (B form), the A-T and G-C base pairs share wh
• 4. Which of the following does not apply to the construction or use of a DNA library? (A) Determinin
• 5.Which vitamin is derived from cholesterol? (A) A (B) B12 (C) D (D) E (E) K
• 6. The shortest o helix segment in a protein that will span a membrane bilayer has about_____amino a
• 7. Which of the following statements concerning receptor enzymes is correct? (A) They are not usuall
• 8. Glycolysis is the name given to a metabolic pathway occurring in many different cell types. It co
• 9. Which one of the following enzymatic activities would be decreased by thiamine deficiency? (A) Fu
• 10. Which of these is able to cross the inner mitochondrial membrane? (A) Acetyl-CoA (B) Fatty acyl-
• 16.Some neurotransmitters or biological amines are derived from the decarboxyl amino acids. Which am
• 20.What are the enzymes inhibited by the medical agents or drugs listed b (A)Fluorouracil, (B) Metho
• 21. Please use hemoglobin as the example to describe the biochemical terms listed below. (10%) (A) p
• 2. In our diets, glucose is often covalently bonded with others in the polymer form of __ (A) a poly
• 3. In living cells, a process by which cells break polymers down into monomers by breaking covalent
• 4. Which statement regarding the DNA and RNA is false? (A) DNA has a main function of storing our ge
• 5. The original three tenets of the cell theory are__? (A) all organisms have DNA, all organisms are
• 6. Which one is false about a cell membrane? (A) a rigid structure；(B) a bilayered structure；(C) com
• 7. Which statement about the eukaryotic cell is correct? (A) does not have membrane-bounded organell
• 8. Penicillin suppresses bacterial infections by__? (A) stimulating a person's immune system；(B
• 9. Which one is the function of the nucleolus? (A) protein synthesis；(B) transport of material into
• 10. Which of the following organelles are also cellular digestion centers? (A) lysosomes and Golgi a
• 11. Which statement about the cytoskeleton is NOT correct? (A) a system of tracks used for intracell
• 12. Oxidation means__? (A) the loss of electrons from a molecule；(B) the loss of oxygen by a cell； (