BIO 111 PRACTICE EXAMS AND TEST QUESTIONS WITH WELL DETAILED SOLUTIONS
What do mitochondria and chloroplasts have in common?
found in almost all plant cells,
evolution from endosymbiotic events
The first law of thermodynamics means that:
plant cells cannot create their own energy
A series of enzymes catalyze the reaction X->Y->Z->A. Product A binds to the enzyme that
converts X to Y at a position remote from its active site. The binding decreases the activity
of the enzyme. Substance A is what?
a feedback inibitor
A cell uses a molecule of ATP to help reactants X and Y form a product X-Y. What is left of
the ATP after this reaction?
ADP and a phosphate group
Which of the following is true of osmosis?
In osmosis, water moves across a membrane from areas of lower solute concentration to
areas of higher solute concentration.
Which graphs are most likely from a human stomach where conditions are strongly acidic?
,temp between 0 and 50 *C
pH between 0 and 4
Which graph best shows the relationship between glucose levels and ATP production by a
cell in an otherwise closed system?
Glucose concentration (y) vs. ATP concentration (X). Decreasing much faster in anaerobic.
Pick the metabolic process that is endergonic.
Going from CO2 into glucose
In oxidative phosphorylation, what is being oxidized and what is being phosphorylated?
NADH; ADP
Which of the following statements is a reasonable explanation for why unsaturated fatty
acids help keep a membrane more fluid at lower temperatures?
The double bonds form kinks in the fatty acid tails, preventing adjacent lipids from packing
tightly.
The figure above depicts the movement of a substance across a cell membrane. The best
way to describe what is occurring in the figure would be: (contains ATP + P + ADP)
active transport
, Five dialysis bags, constructed of a type membrane that is permeable to water and
impermeable to sucrose, were filled with various concentrations of sucrose and then
placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At
10-minute intervals, the bags were massed (weighed) and the percent change in mass of
each bag was graphed.
Which line in the graph represents the bag that contained a solution isotonic to the 0.6 M
solution at the beginning of the experiment?
line decreasing linearly
A chemical reaction that has a positive delta G is best described as ____ while one with a
negative delta G is ____?
endergonic; exergonic
A biologist is studying a cell that has enzymes, DNA, a plasma membrane, ribosomes, and
mitochondria. Given only this information, the cell COULD BE
a plant cell or animal cell, but not a bacterial cell
Substrate-level phosphorylation accounts for approximately what percentage of the ATP
formed by the reactions of glycolysis?
100%
Which of the following is true of enzymes?
Enzymes increase the rate of chemical reactions by lowering the activation energy.
What do mitochondria and chloroplasts have in common?
found in almost all plant cells,
evolution from endosymbiotic events
The first law of thermodynamics means that:
plant cells cannot create their own energy
A series of enzymes catalyze the reaction X->Y->Z->A. Product A binds to the enzyme that
converts X to Y at a position remote from its active site. The binding decreases the activity
of the enzyme. Substance A is what?
a feedback inibitor
A cell uses a molecule of ATP to help reactants X and Y form a product X-Y. What is left of
the ATP after this reaction?
ADP and a phosphate group
Which of the following is true of osmosis?
In osmosis, water moves across a membrane from areas of lower solute concentration to
areas of higher solute concentration.
Which graphs are most likely from a human stomach where conditions are strongly acidic?
,temp between 0 and 50 *C
pH between 0 and 4
Which graph best shows the relationship between glucose levels and ATP production by a
cell in an otherwise closed system?
Glucose concentration (y) vs. ATP concentration (X). Decreasing much faster in anaerobic.
Pick the metabolic process that is endergonic.
Going from CO2 into glucose
In oxidative phosphorylation, what is being oxidized and what is being phosphorylated?
NADH; ADP
Which of the following statements is a reasonable explanation for why unsaturated fatty
acids help keep a membrane more fluid at lower temperatures?
The double bonds form kinks in the fatty acid tails, preventing adjacent lipids from packing
tightly.
The figure above depicts the movement of a substance across a cell membrane. The best
way to describe what is occurring in the figure would be: (contains ATP + P + ADP)
active transport
, Five dialysis bags, constructed of a type membrane that is permeable to water and
impermeable to sucrose, were filled with various concentrations of sucrose and then
placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At
10-minute intervals, the bags were massed (weighed) and the percent change in mass of
each bag was graphed.
Which line in the graph represents the bag that contained a solution isotonic to the 0.6 M
solution at the beginning of the experiment?
line decreasing linearly
A chemical reaction that has a positive delta G is best described as ____ while one with a
negative delta G is ____?
endergonic; exergonic
A biologist is studying a cell that has enzymes, DNA, a plasma membrane, ribosomes, and
mitochondria. Given only this information, the cell COULD BE
a plant cell or animal cell, but not a bacterial cell
Substrate-level phosphorylation accounts for approximately what percentage of the ATP
formed by the reactions of glycolysis?
100%
Which of the following is true of enzymes?
Enzymes increase the rate of chemical reactions by lowering the activation energy.
