BIO 107 MULTIPLE CHOICE
QUESTIONS AND ANSWERS
1. Where are the most reliable scientific results published?
A. in the daily news
B. in science magazines
C. in science journals
D. in peer-reviewed scientific journals - Correct Answers -D
2. In a controlled experiment usually only one factor is changed, which is the
A. controlled variable.
B. coordinate variable.
C. independent variable.
D. dependent variable. - Correct Answers -C
3. Each element is made up of a unique type of
A. atom.
B. protein.
C. neutron.
D. proton and neutron. - Correct Answers -A
4. When the atoms involved in a covalent bond have the same electronegativity, what
type of bond results?
A. an ionic bond
B. a hydrogen bond
C. a nonpolar covalent bond
D. a polar covalent bond - Correct Answers -C
5. Which of the following molecules would you predict to have the largest number of
polar covalent bonds based on their molecular formulas?
A. C2H6O (ethanol)
B. C2H6 (ethane)
C. C2H4O2 (acetic acid)
D. C3H8O (propanol) - Correct Answers -C
6. Which of the following best completes this statement: "Water is polar because..."
A. the covalent bonds within a water molecule are extremely strong.
B. individual water molecules form hydrogen bonds with each other.
C. oxygen atoms are extremely electronegative.
, D. hydrogen and oxygen have different affinities for electrons. - Correct Answers -D
7. Acids have a:
A. High pH, low OH- concentration
B. Low pH, high OH- concentration
C. High pH, low H+ concentration
D. Low pH, high H+ concentration - Correct Answers -D
8. The molecular formula of most monosaccharides represents a multiple of
A. CH3O.
B. CH2O.
C. CHO.
D. CHO2. - Correct Answers -B
9. A glucose molecule contains which one of these functional groups?
A. sulfhydryl
B. hydroxyl
C. amino
D. carboxyl - Correct Answers -B
10. Which of the following statements about animal cell lipids is false?
A. Fat are a form of lipid that function to store energy.
B. Phospholipids are important components of cell membranes.
C. Many lipids function as enzymes.
D. Many lipids function as hormones. - Correct Answers -C
11. Valine is a ________ amino acid?
A. polar
B. negatively charged
C. positively charged
D. nonpolar - Correct Answers -D
12. The tertiary structure of a protein is the:
A. interactions of the central carbon atoms between every fourth amino acid.
B. local interactions of the polypeptide to form α-helices and β-pleated sheets
C. order in which amino acids are joined in a polypeptide chain
D. overall three-dimensional structure of a protein, resulting from folding and cross-
linking of amino-acid residues.
E. bonding together of several polypeptide subunits - Correct Answers -D
1. Areas A and B are separated by a membrane that is permeable to a substance X.
Which set of conditions will result in the greatest rate of diffusion of X into area A?
A. The concentration of X in A is 5 mg/mL; the concentration
of X in B is 1 μg/mL.
B. The concentration of X in A is 10 μg/mL; the concentration
QUESTIONS AND ANSWERS
1. Where are the most reliable scientific results published?
A. in the daily news
B. in science magazines
C. in science journals
D. in peer-reviewed scientific journals - Correct Answers -D
2. In a controlled experiment usually only one factor is changed, which is the
A. controlled variable.
B. coordinate variable.
C. independent variable.
D. dependent variable. - Correct Answers -C
3. Each element is made up of a unique type of
A. atom.
B. protein.
C. neutron.
D. proton and neutron. - Correct Answers -A
4. When the atoms involved in a covalent bond have the same electronegativity, what
type of bond results?
A. an ionic bond
B. a hydrogen bond
C. a nonpolar covalent bond
D. a polar covalent bond - Correct Answers -C
5. Which of the following molecules would you predict to have the largest number of
polar covalent bonds based on their molecular formulas?
A. C2H6O (ethanol)
B. C2H6 (ethane)
C. C2H4O2 (acetic acid)
D. C3H8O (propanol) - Correct Answers -C
6. Which of the following best completes this statement: "Water is polar because..."
A. the covalent bonds within a water molecule are extremely strong.
B. individual water molecules form hydrogen bonds with each other.
C. oxygen atoms are extremely electronegative.
, D. hydrogen and oxygen have different affinities for electrons. - Correct Answers -D
7. Acids have a:
A. High pH, low OH- concentration
B. Low pH, high OH- concentration
C. High pH, low H+ concentration
D. Low pH, high H+ concentration - Correct Answers -D
8. The molecular formula of most monosaccharides represents a multiple of
A. CH3O.
B. CH2O.
C. CHO.
D. CHO2. - Correct Answers -B
9. A glucose molecule contains which one of these functional groups?
A. sulfhydryl
B. hydroxyl
C. amino
D. carboxyl - Correct Answers -B
10. Which of the following statements about animal cell lipids is false?
A. Fat are a form of lipid that function to store energy.
B. Phospholipids are important components of cell membranes.
C. Many lipids function as enzymes.
D. Many lipids function as hormones. - Correct Answers -C
11. Valine is a ________ amino acid?
A. polar
B. negatively charged
C. positively charged
D. nonpolar - Correct Answers -D
12. The tertiary structure of a protein is the:
A. interactions of the central carbon atoms between every fourth amino acid.
B. local interactions of the polypeptide to form α-helices and β-pleated sheets
C. order in which amino acids are joined in a polypeptide chain
D. overall three-dimensional structure of a protein, resulting from folding and cross-
linking of amino-acid residues.
E. bonding together of several polypeptide subunits - Correct Answers -D
1. Areas A and B are separated by a membrane that is permeable to a substance X.
Which set of conditions will result in the greatest rate of diffusion of X into area A?
A. The concentration of X in A is 5 mg/mL; the concentration
of X in B is 1 μg/mL.
B. The concentration of X in A is 10 μg/mL; the concentration
