BIO 101 Chapters 2 and 3 Study Guide
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1.What do fats, steroids, and waxes have in common?
(a) Moderate polarity.
(b) Low solubility in water.
(c) They occur in membranes.
Both (a) and (c).
Both (b) and (c).
Answer: ) Low solubility in water.
2. Dr. Haxton told one of his students, “To move in the bloodstream, fats need the help of phospholipids.” What would a good student say?
A. Yes. Nonpolar molecules aren’t compatible with water.You have it backwards. Fats help phospholipids to travel.
B. Sorry, Dr. Haxton! Help comes from cholesterol, not phospholipids.
C. Not so. Fats are small enough to travel easily without help.
D. Right. Fats are too polar to travel alone in water.
Answer: Sorry, Dr. Haxton! Help comes from cholesterol, not phospholipids.
3. Proteins differ from one another because __________.
A. the peptide bonds linking amino acids differ from protein to protein
B. the number of nucleotides found in each protein varies from molecule to molecule
C. the sequence of amino acids in the polypeptide chain differs from protein to protein
D. each protein contains its own unique sequence of sugar molecules
Answer: the sequence of amino acids in the polypeptide chain differs from protein to protein
4. How many amino acids are found in living organisms?
5. The carboxyl group of an amino acid is composed of __________.
COOHCHan R group signifying the proteinNH2
Answer: one carbon (C) and two oxygen (O) atoms. That carboxyl group has a negative charge, since it is a carboxylic acid (-COOH) that has lost its hydrogen (H) atom
6. The amino group of an amino acid is composed of __________.
D. an R group signifying the protein
8. The R group of an amino acid is also called the __________.
A. side chain
C. carboxyl group
Answer: side chain
9. This animation illustrates the functioning of a _____ protein.
C. structural protein
D. gene regulatory
10. Arrow A is indicating a(n) _____ protein.
11. Arrow D is indicating a _____ protein.
12. Which of these does NOT contain a structural protein?
13. Defensive proteins are manufactured by the _____ system.
12. If a strand of DNA has the nitrogen base sequence 5′-ATTTGC-3′, what will be the sequence of the matching strand?
13. If a DNA double helix is 100 nucleotide pairs long and contains 25 adenine bases, how many guanine bases does it contain?
14. The two strands of a DNA double helix are held together by _____ that form between pairs of nitrogenous bases.
A. hydrogen bonds
B. covalent bonds
C. ionic bondshydrophilic interactions
D. SS bonds
Answer: hydrogen bonds
15. A nucleotide is composed of a(n) _____.
A. amino group, a nitrogen-containing base, and a five-carbon sugar
B. phosphate group, a nitrogen-containing base, and a five-carbon sugar
C. phosphate group, a nitrogen-containing base, and a hydrocarbon
D. sulfhydryl group, a nitrogen-containing base, and a five-carbon sugar
E. glycerol, a nitrogen-containing base, and a five-carbon sugar
Answer: phosphate group, a nitrogen-containing base, and a five-carbon sugar
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