Biology Lab Exam 2 Review Questions and
Answers with Verified Solutions | Latest
Updated 2026
What is activation energy? the minimum amount of energy needed to
start a
chemical reaction
How do enzymes alter activation Without enzymes, the reaction would
energy? require a
higher activation energy to proceed.
With enzymes, the activation energy is
reduced,
allowing the reaction to proceed faster and
at
lower temperatures.
What type of organic compounds Proteins
are most enzymes?
Explain why the lemon juice The lemon juice stops/restrains the
prevented the apple from turning enzyme PPO
brown with reference to enzyme that causes the apple to brown.
activity Lemon juice's pH lowers the pH of the
apple slices,
making PPO function ineffectively.
, What does increased absorbance Absorbance is measured using a
mean over time? spectrophotometer, and it reflects how
much light
a substance absorbs at a specific
wavelength.
An increase in absorbance over time
generally
means that product is being formed as the
reaction
progresses.
Distinguish between the pellet and A pellet is the solid or heavier particles that
supernatant after a sample has settle
been at the bottom of the tube after spinning.
centrifuged. Looks like
a small dot or clump at the bottom.
A supernatant is the liquid portion that
remains
above the pellet. Clear or colored liquid
depending on the sample.
Write the overall equation for 6(CO2) + 6(H2O) + light energy -->
photosynthesis C6-H12-O6 + 6(O2)
Explain the steps of The light-dependent reactions power the
photosynthesis Calvin
cycle.
The ATP and NADPH made in the first
step provide
the energy and reducing power needed to
convert
CO■ into sugars in the second step.
Answers with Verified Solutions | Latest
Updated 2026
What is activation energy? the minimum amount of energy needed to
start a
chemical reaction
How do enzymes alter activation Without enzymes, the reaction would
energy? require a
higher activation energy to proceed.
With enzymes, the activation energy is
reduced,
allowing the reaction to proceed faster and
at
lower temperatures.
What type of organic compounds Proteins
are most enzymes?
Explain why the lemon juice The lemon juice stops/restrains the
prevented the apple from turning enzyme PPO
brown with reference to enzyme that causes the apple to brown.
activity Lemon juice's pH lowers the pH of the
apple slices,
making PPO function ineffectively.
, What does increased absorbance Absorbance is measured using a
mean over time? spectrophotometer, and it reflects how
much light
a substance absorbs at a specific
wavelength.
An increase in absorbance over time
generally
means that product is being formed as the
reaction
progresses.
Distinguish between the pellet and A pellet is the solid or heavier particles that
supernatant after a sample has settle
been at the bottom of the tube after spinning.
centrifuged. Looks like
a small dot or clump at the bottom.
A supernatant is the liquid portion that
remains
above the pellet. Clear or colored liquid
depending on the sample.
Write the overall equation for 6(CO2) + 6(H2O) + light energy -->
photosynthesis C6-H12-O6 + 6(O2)
Explain the steps of The light-dependent reactions power the
photosynthesis Calvin
cycle.
The ATP and NADPH made in the first
step provide
the energy and reducing power needed to
convert
CO■ into sugars in the second step.
