Biochemistry SI Final Exam Questions (Yellow
Answers) Latest 2026/2027 Update | 100%
Correct | A Grade
Chapter 1 PowerPoint
Humans are which of the following:
A. photoautotrophs
B. chemoautotrophs
C. photoheterotrophs
D. chemoheterotrophs
Cyanobacteria are:
,A. photoautotrophs
B. chemoautotrophs
C. photoheterotrophs
D. chemoheterotrophs
You discover a new single-celled organism in a salt lake. Subsequent
laboratory experiments reveal that the organism can live in the
presence or absence of oxygen. This organism would most likely be
classified as: A. an obligate anaerobe in the Bacterial domain
B. an obligate anaerobe in the Archaeal domain
C. a facultative anaerobe in the Archaeal domain
D. a facultative anaerobe in the Bacterial domain
Which organelle is found in both plant and animal cells?
A. starch granule
B. chloroplast
C. mitochondria
D. glyoxysome
Differential centrifugation is based on the differences in
sedimentation rate of biological particles of different__________.
A. Density
B. Size and D. Structure
density
C. Supramolecular complexes, such as
Size chromatin, are held together by: A.
covalent bonds between monomeric units.
B. non-covalent interactions, such as
hydrogen bonds.
C. covalent bonds between
macromolecules.
D. interactions between the cytoskeleton and organelles.
Important functional groups in biomolecules include:
A. lipids.
B. thioesters.
C. nucleic acids.
,D. carbons
Proteins are classified as macromolecules
because they: A. can associate non-covalently
into very large structures.
B. are polymers with molecular weights above ~5,000 Da.
C. can function as enzymes, structural elements, signal receptors, or
transporters. D. are composed of multiple oligomers
What nucleobase is not present in DNA?
A. Cytosine
B. Adenine
C. Guanine
D. Uracil
A living organism is
a(n): A. isolated
system.
B. closed system.
C. open system.
D. universe.
Molecules that differ in configuration
cannot be: A. stereoisomers.
B. cis-trans isomers.
C. chiral centers that are mirror images of each other.
D. chiral centers that can be interchanged by rotation of a single bond.
Enantiomers:
A. are only associated with amino acids.
B. can be specific types of diastereomers.
C. are always designated either D or L.
D. can exist for molecules with more than one chiral carbon.
Chapter 2 PowerPoint
, An unusual characteristic of H2O is:
A. greater density in solid form (ice) than in liquid form (water)
B. high heat of vaporization
C. low specific heat
D. not readily forming intermolecular interactions
Which atom does NOT commonly form hydrogen bonds between or within
biological molecules?
A. oxygen
B. hydrogen
C. carbon
D. nitrogen
Which statement about hydrogen bonds is false?
A. They only occur between water molecules
B. They are weak compared with covalent bonds
C. They cause acid-base reactions in aqueous solutions to be very rapid
D. They have an optimal geometry
Dissolving table sugar into iced tea is an energetically favorable reaction due to
a(n):
A. increase in enthalpy as heat moves into the sugar
B. decrease in free energy due to broken weak interactions between sugar
molecules
C. increase in entropy as the sugar dissolves
D. increase in free energy because there is no longer a solvation layer around the
sugar crystal
Nonpolar compounds:
A. force surrounding H2O molecules to become disordered
B. increase entropy (∆S) when dissolved in water
C. decrease enthalpy (∆H) when dissolved in water
D. interfere with the hydrogen bonding among H2O molecules
Answers) Latest 2026/2027 Update | 100%
Correct | A Grade
Chapter 1 PowerPoint
Humans are which of the following:
A. photoautotrophs
B. chemoautotrophs
C. photoheterotrophs
D. chemoheterotrophs
Cyanobacteria are:
,A. photoautotrophs
B. chemoautotrophs
C. photoheterotrophs
D. chemoheterotrophs
You discover a new single-celled organism in a salt lake. Subsequent
laboratory experiments reveal that the organism can live in the
presence or absence of oxygen. This organism would most likely be
classified as: A. an obligate anaerobe in the Bacterial domain
B. an obligate anaerobe in the Archaeal domain
C. a facultative anaerobe in the Archaeal domain
D. a facultative anaerobe in the Bacterial domain
Which organelle is found in both plant and animal cells?
A. starch granule
B. chloroplast
C. mitochondria
D. glyoxysome
Differential centrifugation is based on the differences in
sedimentation rate of biological particles of different__________.
A. Density
B. Size and D. Structure
density
C. Supramolecular complexes, such as
Size chromatin, are held together by: A.
covalent bonds between monomeric units.
B. non-covalent interactions, such as
hydrogen bonds.
C. covalent bonds between
macromolecules.
D. interactions between the cytoskeleton and organelles.
Important functional groups in biomolecules include:
A. lipids.
B. thioesters.
C. nucleic acids.
,D. carbons
Proteins are classified as macromolecules
because they: A. can associate non-covalently
into very large structures.
B. are polymers with molecular weights above ~5,000 Da.
C. can function as enzymes, structural elements, signal receptors, or
transporters. D. are composed of multiple oligomers
What nucleobase is not present in DNA?
A. Cytosine
B. Adenine
C. Guanine
D. Uracil
A living organism is
a(n): A. isolated
system.
B. closed system.
C. open system.
D. universe.
Molecules that differ in configuration
cannot be: A. stereoisomers.
B. cis-trans isomers.
C. chiral centers that are mirror images of each other.
D. chiral centers that can be interchanged by rotation of a single bond.
Enantiomers:
A. are only associated with amino acids.
B. can be specific types of diastereomers.
C. are always designated either D or L.
D. can exist for molecules with more than one chiral carbon.
Chapter 2 PowerPoint
, An unusual characteristic of H2O is:
A. greater density in solid form (ice) than in liquid form (water)
B. high heat of vaporization
C. low specific heat
D. not readily forming intermolecular interactions
Which atom does NOT commonly form hydrogen bonds between or within
biological molecules?
A. oxygen
B. hydrogen
C. carbon
D. nitrogen
Which statement about hydrogen bonds is false?
A. They only occur between water molecules
B. They are weak compared with covalent bonds
C. They cause acid-base reactions in aqueous solutions to be very rapid
D. They have an optimal geometry
Dissolving table sugar into iced tea is an energetically favorable reaction due to
a(n):
A. increase in enthalpy as heat moves into the sugar
B. decrease in free energy due to broken weak interactions between sugar
molecules
C. increase in entropy as the sugar dissolves
D. increase in free energy because there is no longer a solvation layer around the
sugar crystal
Nonpolar compounds:
A. force surrounding H2O molecules to become disordered
B. increase entropy (∆S) when dissolved in water
C. decrease enthalpy (∆H) when dissolved in water
D. interfere with the hydrogen bonding among H2O molecules
