01
Choose one
1 point
A researcher observes that adding more substrate partially reduces the effect of an inhibitor. Which explanation best fits the evidence?
Free Practice Quiz Question List
05/12 05 Energy, Enzymes, and Cellular Respiration Online Quiz Questions
Use this free practice quiz with 20 questions to review 05/12 05 Energy, Enzymes, and Cellular Respiration, test your knowledge, and prepare for your next test or exam.
20 questions
02
True or false
1 point
True or false: An enzyme can make an energetically unfavorable reaction favorable by changing the reaction's net free-energy change.
- A
True
- B
False
03
Written response
1 point
What term describes inhibition in which a molecule binds at a site other than an enzyme's active site and changes the enzyme's activity?
04
Fill in the blank
1 point
Complete the statements. A pathway that breaks larger molecules into smaller molecules and generally releases usable energy is . A pathway that builds complex molecules from smaller molecules and requires an energy input is .
05
Choose one
1 point
Which description correctly characterizes glycolysis in a eukaryotic cell?
- A
It occurs in the mitochondrial matrix and requires oxygen directly.
- B
It occurs at the inner mitochondrial membrane and uses ATP synthase.
- C
It occurs in the cytosol and does not directly require oxygen.
- D
It occurs in the intermembrane space and uses oxygen as the final electron acceptor.
06
Choose all
1 point
Select all statements that correctly describe glycolysis.
- A
Two ATP are invested during the energy-investment phase.
- B
The pathway directly uses oxygen as a reactant.
- C
One glucose is split into two pyruvate molecules.
- D
ATP is produced by substrate-level phosphorylation.
07
True or false
1 point
True or false: Fermentation allows glycolysis to continue by regenerating NAD+, but it produces no additional ATP beyond glycolysis.
- A
True
- B
False
08
Written response
1 point
How many ATP molecules are gained net from glycolysis per glucose molecule?
09
Fill in the blank
1 point
Complete the explanation of chemiosmosis. The return flow of H+ through drives ATP formation, and the electron transport chain creates a higher H+ concentration in the than in the mitochondrial matrix.
10
Choose one
1 point
Which statement best distinguishes fermentation from anaerobic respiration?
- A
Both processes use oxygen as the final electron acceptor.
- B
Fermentation uses an electron transport chain, but anaerobic respiration does not.
- C
Neither process regenerates oxidized electron carriers.
- D
Fermentation uses an organic final electron acceptor without an electron transport chain, whereas anaerobic respiration uses an electron transport chain with a different final acceptor.
11
Choose all
1 point
Select all features that would strengthen an investigation of how sugar type affects the rate of alcoholic fermentation by yeast.
- A
Keep yeast concentration constant among treatments.
- B
Measure CO2 production at regular intervals with a quantitative method.
- C
Use one trial only to avoid biological variation.
- D
Include several independent trials for each treatment.
- E
Seal the container completely without a pressure-release mechanism.
12
Written response
1 point
A respirometer shows that 1.0 g of germinating seed tissue consumes 3.0 mL of oxygen in 12 minutes. What is the specific respiration rate? Enter the value in mL O2/min/g.
13
Open ended
1 point
Design an investigation to test how temperature affects catalase activity. Describe the independent and dependent variables, at least three controlled variables, a suitable control, replication, how the rate should be measured, and the biological reasoning behind the expected pattern.
14
Choose one
1 point
In aerobic cellular respiration, which molecule serves as the terminal electron acceptor in the electron transport chain?
- A
Carbon dioxide
- B
Oxygen
- C
Glucose
- D
Pyruvate
15
Choose one
1 point
A catalase reaction is tested at temperatures below and above the enzyme's optimum. The reaction rate rises up to the optimum but then falls sharply at higher temperatures. Which explanation best accounts for the decline?
- A
The reaction rate must continue increasing because molecules move faster.
- B
The reaction rate may decline because the enzyme can lose its functional shape.
- C
The substrate is permanently converted into an inhibitor.
- D
The enzyme changes the reaction's equilibrium constant.
16
True or false
1 point
True or false: An enzyme can make an energetically unfavorable reaction favorable simply by lowering its activation energy.
- A
True
- B
False
17
Written response
1 point
How many ATP molecules are produced as the net gain from glycolysis for each glucose molecule?
18
Choose one
1 point
A researcher identifies an ATP-producing step in which an enzyme transfers a phosphate group directly from a phosphorylated substrate to ADP. Which mechanism is being observed?
- A
An enzyme transfers a phosphate directly from a phosphorylated substrate to ADP.
- B
Electrons move through membrane proteins and create a proton gradient.
- C
ATP synthase uses protons flowing across a membrane.
- D
NADH transfers electrons to oxygen to form water.
19
Choose one
1 point
Which statement correctly compares the locations of glycolysis and oxidative phosphorylation in a eukaryotic cell?
- A
Glycolysis occurs in the mitochondrial matrix, and the citric acid cycle occurs in the cytosol.
- B
All stages occur inside the mitochondrial intermembrane space.
- C
Glycolysis occurs in the cytosol, while oxidative phosphorylation occurs at the inner mitochondrial membrane.
- D
Glycolysis and oxidative phosphorylation both occur in the nucleus.
20
Choose one
1 point
Which set of products is generated by one turn of the citric acid cycle for one acetyl-CoA molecule?
- A
1 CO2, 1 NADH, 3 FADH2, and 2 ATP or GTP
- B
2 CO2, 2 NADH, 2 FADH2, and 2 ATP or GTP
- C
4 CO2, 3 NADH, 1 FADH2, and 1 ATP or GTP
- D
2 CO2, 3 NADH, 1 FADH2, and 1 ATP or GTP