10. Another name for a proton donor is a/an A. acid B. oxidizer C. base D. disul

Question

10. Another name for a proton donor is a/an A. acid B. oxidizer C. base D. disulfide bond E. triglyceride 11. Isotopes of an element: A. all have the same half-life B. contain the same number of protons C. can only be made in nuclear reactors D. have the same number of neutrons E. all of the above 12. Triglycerides (triacylglycerides): A. spontaneously form bilayers in water B. are an important means of storing energy C. contain 2 fatty acid tails D. contain 3 glycerol molecules E. contain a phosphorus atom within the head group" 13. Eukaryotic and prokaryotic cells both use flagella for motility. However, these flagella are very different in structure and composition and probably did not evolve from a common ancestral structure Therefore, these structures are said to be A. integral B. homologous C. intrinsic D. progressive E. analogous 14. From its atomic number of 16, it is possible to predict that a sulfur atom has A. 16 neutrons B. 16 protons and 16 neutrons C. 16 valence electrons D. 16 protons and therefore 16 electrons E. a combined number of protons and neutrons that total 16 15. About how many grams of ethanol (C.HO) equals one mole? A. 23 B. 46 C. 92 D. 6 x 10 E. 12 x 10 16. The theory of evolution is critical to all areas of biology because it explains A. why distantly-related organisms sometimes resemble each other B. the diversity of organisms C. why all organisms have characteristics in common D. how organisms become adapted to the environment E. all of the above are true 17. Which one of these hydrocarbons has a double bond in its carbon skeleton? B. C.H C. CH D. C.H E. C2H2 18. Stomach acid has a pH of about 2. How many times greater is the concentration of protons (H ions) in stomach acid than in pure water (pH 7)? A. 5 times B. 500 times C. 7/2 (about 3.5 times) D. 100,000 times E. none of the above 19. Substances that are rich in carbon and hydrogen are usually: A. enantiomers D. isotopes E. hydrophilic 20. Genetic information is passed from one generation to the next by DNA. The structural feature of DNA that is most important to this process is A. the sugar-phosphate backbone B. the pairing between two purines C. phosphodiester bonding between the helices D. hydrogen bonding to form an alpha-helix E. complementary pairing of bases

Explanation / Answer

10 - The correct answer is option A that is an acid.

Acid is also defines as proton donor and base is defined as proton acceptor.

11 - The correct answer is option B that is isotopes contain same number of protons and different number of neutrons.

12 - The correct answer is option B that is triglycerides are an important means of storing energy.

Phospholipid form bilayer in water.

Diglycerides have 2 fatty acids chains.

Triglycerides contains one glycerol and three fatty acid chains.

13 - The correct answer is option E that is analogous organs.

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