8. Which type of covalent bond is the strongest? A. single B. double C. triple D

Question

8. Which type of covalent bond is the strongest? A. single B. double C. triple D. quadruple E. all covalent bonds are equal in strength 9. Which property of water allows it to act as a transport medium? A. cohesion B. high heat of evaporation C. high heat capacity D. water is solvent E. the frozen form is less dense than the liquid form 10. Which of these statements is NOT true about DNA? A. It is the genetic material of the cell B. Adenine pairs with thymine and guanine pairs with cytosine. C. None of the above D. It contains the sugar ribose. 11. A strand of DNA has the following base sequence (genetic code): ATTGCGAATO The complementary strand of DNA would be A. ATTGCGAATGGCA B. TAACGCTTTGCGT C. TAACGCTTACCGT D. TAAGCCTATCGCT 12. Which of the following is a function of a steroid? A. sex hormone B. transmission of genetic information C. long term energy storage D. insulation against cold E. protective layer 13. Which carbohydrate is found in the exoskeleton of insects and crabs? A. starch B. chitin C. cellulose D. glycogen E. glycerol 14. DNA and RNA differ in that a. DNA is single-stranded and contains the sugar deoxyribose andt b. DNA is double-stranded and contains the sugar deoxyribose an c. DNA is single-stranded and contains the sugar ribose and the containing base thymine; RNA is double-stranded and contains s the nitrogen-containing base uracil. containing base thymine; RNA is single-stranded and containss nitrogen-containing base uracil. base thymine; RNA is single-stranded and contains sugar deo nitrogen-containing base uracil.

Explanation / Answer

8. C. Triple covalent bonds are strongest with 2 pi and 1 sigma bond with a bond order of 3.

9. D. The water acts as an excellent solvent and helps in transport of large number of solutes.

10. D. DNA contains sugar deoxyribose and not ribose.

12.A. Function of a steroid is sex hormone and development of sexual characteristics.

13. B. Chitin is found in the exoskeleton of insects and crabs.

14. b. DNA is double stranded molecule with complematary base pairing and contains the base thymine. RNA is a single stranded molecule and contains the nitrogenous base uracil in place of thymine.

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