Water, pH and Macromolecules problems
- 1. Which of the following organic groups are found in naturally occuring amino acids?
Options- A. Guanidinium ion
- B. Indole
- C. Imidazole
- D. All of these Discuss
Correct Answer: All of these
- 2. The reason that fats contain more energy than simple sugars, is fats have many more
Options- A. carbon atoms
- B. hydrogen atoms
- C. covalent bonds
- D. hydrogen bonds Discuss
Correct Answer: covalent bonds
- 3. Buffer solutions
Options- A. will always have a pH of 7
- B. are rarely found in living systems
- C. cause a decrease in pH when acids are added to them.
- D. tend to maintain a relatively constant pH. Discuss
Correct Answer: tend to maintain a relatively constant pH.
- 4. Which of the following alcohols would be most soluble in water?
Options- A. methanol
- B. ethanol
- C. butanol
- D. octanol Discuss
Correct Answer: methanol
- 5. H2O and CH4 are both examples of
Options- A. molecules
- B. ions
- C. acids
- D. none of these Discuss
Correct Answer: molecules
- 6. A solution with pH = 5 is __________ than a solution with pH = 7.
Options- A. 2 times more basic
- B. 10 times more basic
- C. 10 times more acidic
- D. 100 times more acidic Discuss
Correct Answer: 100 times more acidic
- 7. What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7?
Options- A. 7
- B. 7 x 10-7
- C. 5 x 10-7
- D. 1 x 10-7 Discuss
Correct Answer: 1 x 10-7
- 8. Salt dissolves well in water as water molecules
Options- A. form hydrogen bonds with the positively and negatively charged ions
- B. make nonpolar covalent bonds with the positively charged ions only
- C. surround the ions because of their charge but do not form hydrogen bonds
- D. share electrons with the ions to make polar covalent bonds Discuss
Correct Answer: surround the ions because of their charge but do not form hydrogen bonds
- 9. Which of the following statements about water is correct?
Options- A. It is critical for many of the chemical processes found in living systems
- B. Polar substances that can form hydrogen bonds will dissolve in it
- C. Nonpolar substances like oils are not soluble in it
- D. All of the above Discuss
Correct Answer: All of the above
- 10. The strength of an acid depends on
Options- A. number of neutrons gain
- B. electronegativity
- C. number of double bonds
- D. number of protons released Discuss
Correct Answer: electronegativity
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