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• 14. Rate of an uncatalyzed first-order reaction at 300 K is balf of the rate of catalyzed reaction a
• 2. In eukaryotes, the nucleus is enclosed by a double membrane called the : (A) cell membrane.(B) nu
• 3. A major change occurring in the evolution of eukaryotes from prokaryotes was the developmentof: (
• 4. The bacterium E. coli requires simple organic molecules for growth and energy 一 it is thereforea:
• 5. Which one of the following has the cellular components arranged in order of increasing size?(A)Am
• 6. The three-dimensional structure of macromolecules is formed and maintained primarily throughnonco
• 7. Which one of the following is not among the four most abundant elements in living organisms?(A)Ca
• 8. The four covalent bonds in methane (CH4) are arranged around carbon to give which one of thefollo
• 9. The macromolecules that serve in the storage and transmission of genetic information are:(A) carb
• 10. Stereoisomers that are nonsuperimposable mirror images of each other are known as:(A)anomers. (B
• 11. The enzyme fumarase catalyzes the reversible hydration of fumaric acid to 1-malate, but it willn
• 12. Humans maintain a nearly constant level of hemoglobin by continually synthesizing anddegrading i
• 13. If heat energy is absorbed by the system during a chemical reaction, the reaction is said to be:
• 14. If the free energy changeΔG for a reaction is -46.11 kJ/mol , the reaction is:(A) at equilibrium
• 15. The major carrier of chemical energy in all cells is: (A) acetyl triphosphate. (B) adenosinemono
• 16. Enzymes are biological catalysis that enhance the rate of a reaction by: (A) decreasing theactiv
• 17. Energy requiring metabolic pathways that yield complex molecules from simpler precursors are:(A)
• 18. Hereditary information (with the exception of some viruses) is preserved in: (A) nuclei(B)deoxyr
• 19. When a region of DNA must be repaired by removing and replacing some of the nucleotides,what ens
• 20. The three-dimensional structure of a protein is determined primarily by: (A) electrostaticguidan
• 21. According to Oparin’s theory for the origin of life, the prebiotic atmosphere: (A) alreadycontai
• 22. When you run the mixture protein sample using SDS-PAGE, which of following protein couldbe moved
• 23. A compound has a pKa of 7.4. To 100 mL of a 1.0 M solution of this compound at pH 8.0 isadded 30
• 24. Myoglobin and the subunits of hemoglobin have: (A) no obvious structural relationship. (B)very s
• 25. The average molecular weight of the 20 standard amino acids is 138, but biochemists use 110when