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- Question
A biological polymer contains alanine, tyrosine, and lysine. Which of the following will be true about this molecule?
Options- A. DNA
- B. Strong base
- C. Phospholipid
- D. Protein
- Correct Answer
- Protein
- 1. Which of the following acid/base pairs act as natural buffers in living systems?
Options- A. H2CO3/HCO3-
- B. H2PO4-/HPO42-
- C. Histidine+/histidine
- D. All of these Discuss
- 2. If protein is made exclusively from nonpolar amino acids, then it will this protein interact with water?
Options- A. be repelled by water
- B. It will be attracted to water
- C. It will form a membrane in water
- D. It will act as a buffer and stabilize the pH Discuss
- 3. The effectiveness or capacity of a buffer solution can be affected by
Options- A. molar concentration of the buffer components
- B. concentration of the conjugate base to the weak acid
- C. both (a) and (b)
- D. temperature of buffer components Discuss
- 4. A Bronsted acid becomes __________ upon losing a proton.
Options- A. highly reactive
- B. its conjugate acid
- C. its conjugate base
- D. a hydronium ion Discuss
- 5. Which of the following character does not apply to water?
Options- A. The water molecule is asymmetric
- B. The water molecule readily forms hydrophobic interactions
- C. The covalent bonds in water are highly polarized
- D. All three atoms in the water molecule readily form hydrogen bonds Discuss
- 6. The elements oxygen, nitrogen, and carbon
Options- A. can all form covalent bonds with other elements
- B. contain protons and neutrons in their atomic nuclei
- C. are common elements in the molecules that make up living organisms
- D. All of the above Discuss
- 7. The main difference between an acid and a base is that
Options- A. bases are polar molecules and acids are not
- B. acids are polar molecules and bases are not
- C. bases donate hydrogen ions in water while acids accept hydrogen ions
- D. acids donate hydrogen ions in water while bases accept hydrogen ions Discuss
- 8. A compound that is capable of forming hydrogen bonds with water
Options- A. is probably held together by noncovalent bonds
- B. contains at least some polar covalent bonds
- C. should act as a good buffer for acids and bases
- D. does not dissolve well in water Discuss
- 9. Most of the important functional groups in biological molecules contain
Options- A. oxygen and/or nitrogen and are acidic
- B. oxygen and a phosphate
- C. nitrogen and a phosphate
- D. oxygen and/or nitrogen and are polar Discuss
- 10. Which amino acids would most likely reside in the membrane-anchoring domain of a membrane embedded protein?
Options- A. Isoleucine, valine and phenylalanine
- B. Phenylalanine, valine, and aspartate
- C. Leucine, threonine, and lysine
- D. Lysine, arginine and histidine Discuss
Water, pH and Macromolecules problems
Search Results
Correct Answer: All of these
Correct Answer: be repelled by water
Correct Answer: both (a) and (b)
Correct Answer: its conjugate base
Correct Answer: The water molecule readily forms hydrophobic interactions
Correct Answer: All of the above
Correct Answer: acids donate hydrogen ions in water while bases accept hydrogen ions
Correct Answer: contains at least some polar covalent bonds
Correct Answer: oxygen and/or nitrogen and are polar
Correct Answer: Isoleucine, valine and phenylalanine
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