BCH 369 EXAM 1
Which of the following types of bonding interactions is NOT classified as non-covalent?
A) Hydrogen bonding. D) Dipole-Dipole interactions.
B) Electrostatic interactions. E) None of the above.
C) Van der Waals. - correct answer ✔✔E) None of the above.
The fractional saturation of oxygen for hemoglobin during exercise is 15%. Based on the curve below,
what is the dominant form of hemoglobin at this value?
A) T B) R - correct answer ✔✔A) T
In an alpha-helix, which amino acid residue makes a hydrogen bond to the 3rd residue?
A) 1st B) 6th C) 7th D) 4th - correct answer ✔✔C) 7th
Which functional group below cannot make a hydrogen bond to water?
A) methyl B) hydroxyl C) carboxyl D) amine - correct answer ✔✔A) methyl
Which of the following forces stabilize protein primary structure at physiological pH?
A) covalent bonds B) hydrophobic effect C) ion pairs D) H-bonds - correct answer ✔✔A) covalent bonds
Hydrogen-bonded atoms are separated by van der Waals distances.
A) True B) False - correct answer ✔✔B) False
Hydrophobic interactions may occur between the R-groups of which of the following pairs of amino
acids:
A) Arg and His B) Tyr and Gly C) Val and Asn D) Phe and Trp E) His and Asp - correct answer ✔✔D) Phe
and Trp
, All eukaryotes are multicellular organisms.
A) True B) False - correct answer ✔✔B) False
Two amino acids of the standard 20 contain hydroxyl-groups. They are:
A) cysteine and threonine. D) methionine and cysteine.
B) cysteine and serine. E) methionine and serine.
C) threonine and serine. - correct answer ✔✔C) threonine and serine.
The Bohr effect facilitates the exchange of what gaseous by-product of cellular respiration between the
blood and the lungs?
A) N2 B) CO2 C) O2 D) NO E) H2S - correct answer ✔✔B) CO2
Which of the following statements is not accurate when considering water and biological molecules?
A) Water can act as a hydrogen bond donor.
B) Polar substances are soluble because of their interaction with water.
C) Water can act as a hydrogen bond acceptor.
D) Non-polar substances associate with water to maximize their exposed surface area. - correct answer
✔✔D) Non-polar substances associate with water to maximize their exposed surface area.
Growth of actin filaments is dynamic and continuous under normal cellular conditions.
A) True B) False - correct answer ✔✔A) True
Which of the molecules below contains an amide group?
A) (a) B) (b) C) (c) D) (d) E) None of the above - correct answer ✔✔A) (a)
Which of the following amino acids has the most significant role in the molecular mechanisms of
hemoglobin's function?
A) Gly B) Glu C) Tyr D) His E) Lys - correct answer ✔✔D) His
Which of the following types of bonding interactions is NOT classified as non-covalent?
A) Hydrogen bonding. D) Dipole-Dipole interactions.
B) Electrostatic interactions. E) None of the above.
C) Van der Waals. - correct answer ✔✔E) None of the above.
The fractional saturation of oxygen for hemoglobin during exercise is 15%. Based on the curve below,
what is the dominant form of hemoglobin at this value?
A) T B) R - correct answer ✔✔A) T
In an alpha-helix, which amino acid residue makes a hydrogen bond to the 3rd residue?
A) 1st B) 6th C) 7th D) 4th - correct answer ✔✔C) 7th
Which functional group below cannot make a hydrogen bond to water?
A) methyl B) hydroxyl C) carboxyl D) amine - correct answer ✔✔A) methyl
Which of the following forces stabilize protein primary structure at physiological pH?
A) covalent bonds B) hydrophobic effect C) ion pairs D) H-bonds - correct answer ✔✔A) covalent bonds
Hydrogen-bonded atoms are separated by van der Waals distances.
A) True B) False - correct answer ✔✔B) False
Hydrophobic interactions may occur between the R-groups of which of the following pairs of amino
acids:
A) Arg and His B) Tyr and Gly C) Val and Asn D) Phe and Trp E) His and Asp - correct answer ✔✔D) Phe
and Trp
, All eukaryotes are multicellular organisms.
A) True B) False - correct answer ✔✔B) False
Two amino acids of the standard 20 contain hydroxyl-groups. They are:
A) cysteine and threonine. D) methionine and cysteine.
B) cysteine and serine. E) methionine and serine.
C) threonine and serine. - correct answer ✔✔C) threonine and serine.
The Bohr effect facilitates the exchange of what gaseous by-product of cellular respiration between the
blood and the lungs?
A) N2 B) CO2 C) O2 D) NO E) H2S - correct answer ✔✔B) CO2
Which of the following statements is not accurate when considering water and biological molecules?
A) Water can act as a hydrogen bond donor.
B) Polar substances are soluble because of their interaction with water.
C) Water can act as a hydrogen bond acceptor.
D) Non-polar substances associate with water to maximize their exposed surface area. - correct answer
✔✔D) Non-polar substances associate with water to maximize their exposed surface area.
Growth of actin filaments is dynamic and continuous under normal cellular conditions.
A) True B) False - correct answer ✔✔A) True
Which of the molecules below contains an amide group?
A) (a) B) (b) C) (c) D) (d) E) None of the above - correct answer ✔✔A) (a)
Which of the following amino acids has the most significant role in the molecular mechanisms of
hemoglobin's function?
A) Gly B) Glu C) Tyr D) His E) Lys - correct answer ✔✔D) His
