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• 3. Hydrogen cyanide gas (HCN), a powerful respiratory inhibitor, is highly toxic. It is a very weak
• 4. Which of the following molecules are nonlinear?NO2–, C2H2, N3–, HCN, CO2, H2O2 , N2O (central ato
• 15. Which of the followings is NOT true for cilia or flagella?(A) They are involved in cell motility
• 16. Which of the following scientist-discoveries is mismatched?(A) Watson and Crick – DNA structure.
• 17. Which of the following statements best describes DNA polymerase?(A) It is an enzyme required to
• 14. Which of the following is not the components of an operon(A) operator.(B) promoter.(C) co-repres
• 6. An aqueous solution of 10.00 g of catalase, an enzyme found in the liver, has a volume of 1.00 L
• 18. A DNA specimen that contains 30% guanine has ________ thymine.(A) 10%(B) 20%(C)30%(D) 40%(E) The
• 20. Which animal would you predict would have the highest mass-specific metabolic rate?(A) a lizard(
• 5. Calculate the concentration of Ag+ in a solution prepared by mixing 150.0 mL 1.0×10－3 M AgNO3 wit
• 19. Bile is crucial for ______ digestion because of its function in _____.(A) protein, protecting th
• 21. Which structure prevents blood flowing back into the atria during ventricular contractions?(A) a
• 8. Which of the following is the correct order for molecules from most to least polar?(A) CH4 > C
• 7. You have 75.0 mL of 0.10 M HA. After adding 30.0 mL of 0.10 M NaOH, the pH is 5.50. What is the K
• 9. Which of the following molecules exhibits chirality?I. 1-chloroethanol II. 2-chloroethanol III. 2
• 22. Which of the following statements about RNA polymerase in bacteria is INCORRECT?(A) It binds the
• 10. At a particular temperature, 12.0 moles of SO3 is placed into a 3.0 L rigid container, and the S
• 12. Consider the following orderings. I. Al＜Si＜P＜Cl        II. Be＜Mg＜Ca＜SrIII. I＜Br＜Cl＜F         IV.
• 11. Assuming that the combustion of hydrogen gas provides three times as much energy per gram as gas
• 13. A 0.739-g sample of an iron ore is dissolved in acid. The iron is then reduced to Fe2+ and titra
• 14. Which of the following are paramagnetic? O2 O2– O22– B2 C2 N2 F2 P2(A) O2, O22– , B2 (B) O2–, C2
• 25. The respiratory centers that control ventilation of the lungs in mammals are located in the(A) b
• 24. What protein is involved in synthesizing messenger RNA in eukaryotes?(A) RNA polymerase I(B) RNA
• 26. The ascending portion of the loop of Henle is(A) permeable to water and impermeable to sodium.(B
• 28. Which of these hormone-effect pairs is mismatched?(A) growth hormone-linear growth(B) glucagon-b