Unit 3: Cellular Energetics
Biology · Unit 3 · Paper 1

Cellular Energetics unit test

A test on this unit alone, marked as a percentage and a letter grade — for the test your class is actually sitting, rather than for May. Answer everything, then submit once: seeing the answer to question 3 before attempting question 4 makes the final percentage meaningless.

Paper 1Paper 2Paper 3
Each paper is built from this unit’s 40 terms and is the same for everyone, so a teacher can assign “Unit 3, Paper 1” and every student sits the identical test. Multiple choice is marked objectively; the written sections you mark yourself against the model answer and rubric.
Suggested time 31 min 28 points0/17 attempted
1

Rubisco and photorespiration

2

Products of the light reactions

3

Glycolysis

4

Allosteric regulation

5

Enzyme mechanism

6

Coupled reactions

7

Calvin cycle

8

Light-dependent reactions

9

Effect of temperature on enzymes

10

Enzyme specificity

11

Pyruvate oxidation

12

Anabolic vs catabolic pathways

Short answer 1. Define or explain: Free energy and ΔG

3 pts

Short answer 2. Define or explain: Photosystems II and I

3 pts

Short answer 3. Define or explain: Chemiosmosis

3 pts

Short answer 4. Define or explain: C4 and CAM plants

3 pts

Free response

4 pts

An enzyme catalyses the breakdown of hydrogen peroxide. A student measures reaction rate at pH values from 3 to 11 and finds the rate peaks sharply at pH 7 and is nearly zero at pH 3 and pH 11.

Identify the independent variable and the dependent variable.

Explain why the reaction rate is near zero at pH 3.

Predict the effect on rate of adding more substrate at pH 7 while enzyme concentration is held constant, and justify your answer.