Question 1
Which row best describes an oxidation reaction?
| Hydrogen | Oxygen | Electrons | Energy | |
| A | Loss | Gain | Loss | Released |
| B | Gain | Gain | Loss | Absorbed |
| C | Gain | Loss | Loss | Released |
| D | Loss | Gain | Loss | Absorbed |
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DP IB Biology: HL
Topic Questions
8.2 Cell Respiration
Question 2
Which of the following best shows the reduction of NAD?
NAD + H₂ →NADH + H⁺
NAD⁺ + e⁻ + H⁺ → NADH + H
NAD + 2H + 2e⁻ → NADH
NAD⁺ + 2e⁻ + 2H⁺ → NADH + H⁺
Question 3
Which statements correctly describe phosphorylation and dephosphorylation reactions?
- The phosphorylation of ADP is an endergonic reaction.
- The dephosphorylation of ATP is an endergonic reaction.
- The phosphorylation of ADP is a hydrolysis reaction.
- The dephosphorylation of ATP is a hydrolysis reaction.
I and II
II and III
I and IV
II and IV
Question 4
Which row shows the products of glycolysis?
| ATP | Pyruvate | Glucose | Reduced NAD | |
| A | 4 | 2 | 0 | 2 |
| B | 2 | 2 | 2 | 2 |
| C | 2 | 1 | 1 | 2 |
| D | 2 | 2 | 0 | 2 |
Question 5
The diagram below shows a simplified Krebs cycle.
How many times does decarboxylation occur during the Krebs cycle?
Once
Twice
Three times
Four times
Question 6
Which of the following is true of oxidative phosphorylation?
- It is the last stage of aerobic respiration.
- It takes place on the inner mitochondrial membrane.
- It involves chemiosmosis.
- It involves the electron transport chain.
I, II, and IV
II and IV
I, II, and III
I, II, III, and IV
Question 7
The diagram below represents a simplified version of the electron transport chain and chemiosmosis.
Which row correctly describes the events labelled 1-4 above?
| 1 | 2 | 3 | 4 | |
| A | Protons move across the cristae into the intermembrane space | Protons move across the cristae into the intermembrane space | Protons are pumped through ATP synthase | ADP is phosphorylated |
| B | Protons move across the cristae into the matrix | Protons move across the cristae into the matrix | Protons are pumped through ATP synthase | ATP is phosphorylated |
| C | Protons move across the cristae into the intermembrane space | Protons move across the cristae into the intermembrane space | Protons diffuse through ATP synthase | ADP is phosphorylated |
| D | Protons move across the cristae into the intermembrane space | Protons move across the cristae into the intermembrane space | Protons diffuse through ATP synthase | ATP is phosphorylated |
Question 8
Chemiosmotic theory was proposed by Nobel Prize winner Peter Mitchell in the 1960s, leading to what is considered to be a paradigm shift.
Which of the following correctly defines the term paradigm shift?
A significant change to the set of ideas that underpin scientific thinking.
When a new discovery leads to advances in scientific knowledge.
The acceptance of novel and radical ideas.
The acceptance of Darwin’s theory of evolution by natural selection.
Question 9
The diagram below shows a mitochondrion.
Where in this organelle is ATP synthase found?
Question 10
Which row correctly shows the features of a mitochondrion that can be observed and labelled on a drawing using a transmission electron microscope (TEM)?
| Mitochondrion shape | RNA and DNA | Cristae | Intermembrane space | |
| A | Yes | Yes | Yes | Yes |
| B | Yes | No | Yes | No |
| C | Yes | Yes | No | Yes |
| D | Yes | No | Yes | Yes |
