Electron Transport Chain, ATP, Membrane Space, Pyruvate. Final Test – Biochemistry
The key terms in this Biochemistry course include Electron Transport Chain, Oxygen, ATP, NADP, Pyruvate, Glucose, Acceptor, Citric Acid Cycle, Proton Gradient, Membrane Space, Protons, Matrix, CO2, Ethanol, Acetyl CoA, Light Harvesting Complex, Pigment Molecules, NADPH, Photosystem, Chlorophyll, Calvin Cycle.
Which of the following statements best describes the primary role played by oxygen in cellular respiration?
It yields energy in the form of ATP as it is passed down the electron transport chain.
Oxygen oxidizes glucose to form two molecules of pyruvate.
It serves as an acceptor for carbon, forming CO2 in the citric acid cycle.
It serves as the final acceptor for electrons from the electron transport chain. – correct
Which of the following maintains the proton gradient across in the inner mitochondrial membrane? Choose ALL the correct choices.
The ETC pumps protons into the matrix
The ETC pumps protons into the inner membrane space- correct
Water is formed in the matrix reducing the hydrogen concentration in the matrix- correct
Water is formed in the matrix increasing the hydrogen concentration in the matrix
The water is formed in the inner membrane space increasing the hydrogen concentration in the inner membrane space
Water is formed in the inner membrane space decreasing the hydrogen concentration in the inner membrane space
Which of the following sequences describes the path by which electrons travel downhill energetically in aerobic respiration?
glucose → NADH → electron transport chain → oxygen – correct
glucose → pyruvate → ATP → oxygen
food → glycolysis → citric acid cycle → NADH → ATP
glucose → pyruvate → electron transport chain → NADH → ATP
In the absence of oxygen, yeast cells can obtain energy by fermentation, which results in the production of which of the following sets of molecules?
ATP, CO2, and ethanol (ethyl alcohol) – correct
CO2, ATP, and lactate
ATP, NADH, and ethanol
ATP, CO2, and acetyl CoA
Match the following to label the diagram of the chloroplast.
Stroma
F
Tylakoid Space
E
Thylakoid Membrane
G
Outer membrane
B
Granum
D
Inner membrane
C
Intermembrane Space
A
In a plant, which of the following reactions produce molecular oxygen (O2)?
the light reactions alone- correct
the Calvin cycle alone
the light reactions and the Calvin cycle
neither the light reactions nor the Calvin cycle
Plants containing only chlorophyll b are exposed to radiation with the following wavelengths: 10nm (x-rays), 450nm (blue light), 670nm (red light), and 800nm (infrared light). Which plants harness the most energy for photosynthesis?
X-ray irradiated plants
Blue light irradiated plants- correct
Red light irradiated plants
Infrared irradiated plants
Match the following to label the diagram.
Reaction Center
D
Thylakoid Membrane
A
Light Harvesting Complex
B
Primary Electron Acceptor
E
Pigment Molecules (e.g. chlorophyll a, chlorophyll b, beta-carotene)
C
Which of the following sequences describes the path by which electrons travel downhill energetically in aerobic respiration?
glucose → NADH → electron transport chain → oxygen – correct
glucose → pyruvate → ATP → oxygen
food → glycolysis → citric acid cycle → NADH → ATP
glucose → pyruvate → electron transport chain → NADH → ATP
In the absence of oxygen, yeast cells can obtain energy by fermentation, which results in the production of which of the following sets of molecules?
ATP, CO2, and ethanol (ethyl alcohol) – correct
CO2, ATP, and lactate
ATP, NADH, and ethanol
ATP, CO2, and acetyl CoA
Match the following to label the diagram of the chloroplast.
Stroma
F
Tylakoid Space
E
Thylakoid Membrane
G
Outer membrane
B
Granum
D
Inner membrane
C
Intermembrane Space
A
In a plant, which of the following reactions produce molecular oxygen (O2)?
the light reactions alone- correct
the Calvin cycle alone
the light reactions and the Calvin cycle
neither the light reactions nor the Calvin cycle
From which component of the light-dependent reactions does NADPH form most directly?
photosystem II
photosystem I – correct
cytochrome complex
ATP synthase
What happens to the free energy released as electrons are passed from photosystem II to photosystem I through a series of electron carriers?
It excites electrons of the reaction center in photosystem I.
It is used to establish and maintain a proton gradient. – correct
Used to synthesize ATP through substrate-level phosphorylation.
It is used to phosphorylate NAD+ to NADPH.
Which of the following events accompanies absorption of energy by pigment molecules of the light harvesting complex?
ATP is synthesized from the energy absorbed.
An electron is excited. – correct
NADP+ is reduced to NADPH.
A molecule of water is split.
Which of the following sequences describes the path by which electrons travel downhill energetically in aerobic respiration?
glucose → NADH → electron transport chain → oxygen – correct
pyruvate → glucose → ATP → oxygen
glucose → pyruvate → electron transport chain → NADH → ATP
food → glycolysis → citric acid cycle → NADH → ATP
In the absence of oxygen, yeast cells can obtain energy by fermentation, which results in the production of which of the following sets of molecules?
ATP, CO2, and ethanol (ethyl alcohol) – correct
ATP, CO2, and lactate
NADH, ATP, and ethanol
ATP, CO2, and acetyl CoA
Match the following to label the diagram of the chloroplast.
Stroma
F
Tylakoid Space
E
Thylakoid Membrane
G
Outer membrane
B
Granum
D
Inner membrane
C
Intermembrane Space
A
In a plant, which of the following reactions produce molecular oxygen (O2)?
the light reactions alone- correct
the Calvin cycle alone
the light reactions and the Calvin cycle
neither the light reactions nor the Calvin cycle