BIOL 101 QUIZ 8 EXAM SCRIPT 2026
QUESTIONS WITH ANSWERS GRADED A+
◉ In mitochondria, the electron transport chain pumps protons
from the matrix into the intermembrane space. In what direction are
protons pumped by the electron transport chain in chloroplasts?
Answer: from the stroma to the thylakoid space
◉ Which of the following reactions reduce(s) oxygen to form water?
Answer: cellular respiration only
◉ Photorespiration occurs when rubisco combines RuBP with which
of the following molecules? Answer: O2
◉ What is the primary function of the pigment molecules in a light-
harvesting complex? Answer: to transfer light energy to the
reaction-center chlorophyll
◉ P680+ is often considered the strongest biological oxidizing agent.
Given its function, why is this necessary? Answer: It obtains
electrons from the oxygen atom in a water molecule, so it must have
a greater affinity for electrons than oxygen has.
, ◉ Use the figure and the compounds labeled A, B, C, D, and E to
answer the following question. If ATP used by this plant is labeled
with radioactive phosphorus, which molecule or molecules of the
Calvin cycle will be radioactively labeled first? Answer: B and E only
◉ Carotenoids are found in several foods that are considered to have
antioxidant properties in human nutrition. What related function do
they have in plants? Answer: They absorb and dissipate excess light
energy that might otherwise react with oxygen to form harmful
oxidative molecules.
◉ The NADPH required for the Calvin cycle is produced by which of
the following metabolic reactions? Answer: reactions initiated in
photosystem I
◉ Some photosynthetic organisms contain chloroplasts that lack
photosystem II, yet they are able to survive. Which of the following
experimental approaches would be a reasonable way to detect the
lack of photosystem II in these organisms? Answer: Test whether
they release O2 in the light.
◉ Cellular respiration in plant cell mitochondria consumes
approximately what proportion of the organic molecules produced
by photosynthesis? Answer: 50%
QUESTIONS WITH ANSWERS GRADED A+
◉ In mitochondria, the electron transport chain pumps protons
from the matrix into the intermembrane space. In what direction are
protons pumped by the electron transport chain in chloroplasts?
Answer: from the stroma to the thylakoid space
◉ Which of the following reactions reduce(s) oxygen to form water?
Answer: cellular respiration only
◉ Photorespiration occurs when rubisco combines RuBP with which
of the following molecules? Answer: O2
◉ What is the primary function of the pigment molecules in a light-
harvesting complex? Answer: to transfer light energy to the
reaction-center chlorophyll
◉ P680+ is often considered the strongest biological oxidizing agent.
Given its function, why is this necessary? Answer: It obtains
electrons from the oxygen atom in a water molecule, so it must have
a greater affinity for electrons than oxygen has.
, ◉ Use the figure and the compounds labeled A, B, C, D, and E to
answer the following question. If ATP used by this plant is labeled
with radioactive phosphorus, which molecule or molecules of the
Calvin cycle will be radioactively labeled first? Answer: B and E only
◉ Carotenoids are found in several foods that are considered to have
antioxidant properties in human nutrition. What related function do
they have in plants? Answer: They absorb and dissipate excess light
energy that might otherwise react with oxygen to form harmful
oxidative molecules.
◉ The NADPH required for the Calvin cycle is produced by which of
the following metabolic reactions? Answer: reactions initiated in
photosystem I
◉ Some photosynthetic organisms contain chloroplasts that lack
photosystem II, yet they are able to survive. Which of the following
experimental approaches would be a reasonable way to detect the
lack of photosystem II in these organisms? Answer: Test whether
they release O2 in the light.
◉ Cellular respiration in plant cell mitochondria consumes
approximately what proportion of the organic molecules produced
by photosynthesis? Answer: 50%
