Download A planarian has a mutation that affects mitochondria. The planarian

2.5 B: Energy Structure of Cells Quiz
1.
A planarian has a mutation that affects mitochondria. The planarian moves slower and has a
slower rate of growth and reproduction than a normal planarian. A mitochondrion from a normal
planarian (planarian X) and a mitochondrion from the planarian with the mutation (planarian Y)
are shown below.
Which statement best explains why planarian Y moves, grows, and reproduces at a slower rate
than planarian X?
(A) The mitochondrion from planarian Y does not have a large enough surface area to absorb
food and oxygen to produce ATP.
(B) The mitochondrion from planarian Y does not have enough space in the matrix to store
enzymes needed to generate ATP through the oxidation of organic molecules.
(C) The mitochondrion from planarian Y does not have a large enough surface area to hold
electron-transferring proteins and is unable to adequately oxidize NADH and FADH2 to
generate enough ATP.
(D) The mitochondrion from planarian Y does not have the ability to pump H+ into the
intermembrane space, and is unable to produce ATP through chemiosmosis.
Page 1 of 3
2.5 B: Energy Structure of Cells Quiz
2.
Cyanide is introduced into a culture of cells and is observed binding to a mitochondrion, as
shown in the diagram below.
The following observations are made:
• Cyanide binds to and inhibits an enzyme in the inner mitochondrial membrane.
• There is a decrease in water production in the inner mitochondrial membrane.
• Cyanide causes a build-up of electrons in the form of NADH.
Which statement best explains how cyanide disrupts cellular processes?
(A) Cyanide prevents organic molecules from entering the mitochondrion.
(B) Cyanide prevents enzymes from splitting glucose in substrate-level phosphorylation.
(C) Cyanide prevents the production of carbon dioxide by binding to the enzymes involved in
the citric acid cycle.
(D) Cyanide prevents the oxidation of energy-rich molecules by binding to enzymes that
facilitate movement of the electrons in the electron transport chain.
Page 2 of 3
2.5 B: Energy Structure of Cells Quiz
3.
The diagram below shows the pathway for the movement of electrons in a mitochondrion.
Which statement describes the process in chloroplasts that is most similar to the process shown
in the diagram?
(A) The reduction of carbon dioxide into 3-carbon sugars in the stroma during the Calvin cycle
(B) The excitation of electrons in photosystem II on the thylakoid membrane during the lightdependent reaction
(C) The movement of hydrogen ions from a high concentration inside of the thylakoid space to
the stroma via chemiosmosis
(D) The oxidation of proteins on the thylakoid membrane during noncyclic
photophosphorylation to create an electrochemical gradient
Page 3 of 3