BIO 245 END OF COURSE EXAM QUESTIONS AND
SOLUTIONS RATED A+
✔✔Monounsaturated fatty acids are liquid at room temperature and contain one carbon-
carbon double bonds. - ✔✔Answer 1: Monounsaturated
Answer 2: one
✔✔A phospholipid is comprised of a glycerol molecule, a phosphate group, and ___. -
✔✔two fatty acid chains
✔✔Oligopeptide - ✔✔polymer of about 20 amino acids
✔✔steroid - ✔✔four fused ring structure that is bound in cell membrane
✔✔polysaccharide - ✔✔composed of hundreds of monosaccharides used to store
energ
✔✔secondary protein structure - ✔✔formed via hydrogen bonding between functional
groups
✔✔tertiary protein strucutre - ✔✔formed via bonds between residue groups of
polypeptide chains
✔✔conjugated protiens - ✔✔composed of a protien and non protein portion such as
hemoglobin
✔✔Which of the following describes a molecule with an electron gained? - ✔✔reduced
✔✔Which of the following is NOT an example of a reduced electron carrier? - ✔✔NAD+
✔✔Which molecule is termed as cellular energy currency? - ✔✔adenosine triphosphate
✔✔Which of the following best characterizes anabolic pathways? Choose ALL that
apply. - ✔✔-Involves the assembly of complex molecules from simple molecules
-Requires ATP energy
-An endergonic and non-spontaneous reaction
✔✔saturation point - ✔✔the point of high substrate concentration and plateu of enzyme
activity
✔✔catalyst - ✔✔lowers activation energy for a reaction
✔✔cofactor - ✔✔inorganic helper molecule required for optimal enzymatic activiyt
, ✔✔competitive inhibition - ✔✔involves the direct binding of an active site of an enzyme
and blocks binding of normal substances
✔✔noncompetitive inhibiitions - ✔✔involves binding of inhibitor to an allosteric site
location and causes a conformational change of active site that reduces substrate
affinity
✔✔phospolipase - ✔✔hydrolyzes phospholipids into fatty acids
✔✔Which of the following does NOT represent an electron carrier involved in electron
transport system? - ✔✔Hemoglobin
✔✔Which of the following characterizes energy acquisition of chemotrophs? -
✔✔Organic or inorganic compounds
✔✔Which of the following does NOT characterize xenobiotics? - ✔✔Human-derived
compounds at lower concentrations relative to natural
✔✔As a lab technician you are tasked to differentiate two microbial organisms. You
characterize Organism B as positive for_______ due to the culture media being
_______ after refrigeration - ✔✔gelatinase
iquid
✔✔A ________ involves the transfer of solar energy between photosynthetic pigments
and represents a component of photosystems. - ✔✔light-harvesting complex
✔✔Bacteria most commonly undergoes this mode of asexual reproduction? - ✔✔binary
fission
✔✔The ______ phase represents when a bacterial cell number increases exponentially
and when bacterial cells are most susceptible towards antimicrobials. - ✔✔log
✔✔Determine the original cell density (OCD) according to the following details:
Colony forming units (CFUs): 1056
Tube Dilution (D): 10-3
Volume of diluted culture transferred to agar plate (V): 0.1 mL
Equation: OCD = CFU/DxV - ✔✔1.1 x 10^7 CFU/mL
✔✔Which statement best characterizes a countable plate? - ✔✔Contains 30 to 300
CFUs
✔✔cells are attached to a substrate or surface in a biofilm - ✔✔sessile
SOLUTIONS RATED A+
✔✔Monounsaturated fatty acids are liquid at room temperature and contain one carbon-
carbon double bonds. - ✔✔Answer 1: Monounsaturated
Answer 2: one
✔✔A phospholipid is comprised of a glycerol molecule, a phosphate group, and ___. -
✔✔two fatty acid chains
✔✔Oligopeptide - ✔✔polymer of about 20 amino acids
✔✔steroid - ✔✔four fused ring structure that is bound in cell membrane
✔✔polysaccharide - ✔✔composed of hundreds of monosaccharides used to store
energ
✔✔secondary protein structure - ✔✔formed via hydrogen bonding between functional
groups
✔✔tertiary protein strucutre - ✔✔formed via bonds between residue groups of
polypeptide chains
✔✔conjugated protiens - ✔✔composed of a protien and non protein portion such as
hemoglobin
✔✔Which of the following describes a molecule with an electron gained? - ✔✔reduced
✔✔Which of the following is NOT an example of a reduced electron carrier? - ✔✔NAD+
✔✔Which molecule is termed as cellular energy currency? - ✔✔adenosine triphosphate
✔✔Which of the following best characterizes anabolic pathways? Choose ALL that
apply. - ✔✔-Involves the assembly of complex molecules from simple molecules
-Requires ATP energy
-An endergonic and non-spontaneous reaction
✔✔saturation point - ✔✔the point of high substrate concentration and plateu of enzyme
activity
✔✔catalyst - ✔✔lowers activation energy for a reaction
✔✔cofactor - ✔✔inorganic helper molecule required for optimal enzymatic activiyt
, ✔✔competitive inhibition - ✔✔involves the direct binding of an active site of an enzyme
and blocks binding of normal substances
✔✔noncompetitive inhibiitions - ✔✔involves binding of inhibitor to an allosteric site
location and causes a conformational change of active site that reduces substrate
affinity
✔✔phospolipase - ✔✔hydrolyzes phospholipids into fatty acids
✔✔Which of the following does NOT represent an electron carrier involved in electron
transport system? - ✔✔Hemoglobin
✔✔Which of the following characterizes energy acquisition of chemotrophs? -
✔✔Organic or inorganic compounds
✔✔Which of the following does NOT characterize xenobiotics? - ✔✔Human-derived
compounds at lower concentrations relative to natural
✔✔As a lab technician you are tasked to differentiate two microbial organisms. You
characterize Organism B as positive for_______ due to the culture media being
_______ after refrigeration - ✔✔gelatinase
iquid
✔✔A ________ involves the transfer of solar energy between photosynthetic pigments
and represents a component of photosystems. - ✔✔light-harvesting complex
✔✔Bacteria most commonly undergoes this mode of asexual reproduction? - ✔✔binary
fission
✔✔The ______ phase represents when a bacterial cell number increases exponentially
and when bacterial cells are most susceptible towards antimicrobials. - ✔✔log
✔✔Determine the original cell density (OCD) according to the following details:
Colony forming units (CFUs): 1056
Tube Dilution (D): 10-3
Volume of diluted culture transferred to agar plate (V): 0.1 mL
Equation: OCD = CFU/DxV - ✔✔1.1 x 10^7 CFU/mL
✔✔Which statement best characterizes a countable plate? - ✔✔Contains 30 to 300
CFUs
✔✔cells are attached to a substrate or surface in a biofilm - ✔✔sessile
