The diagram below shows a mitochondrion.
Which letter represents the mitochondrial matrix?
Did this page help you?
Syllabus Edition
First teaching 2014
Last exams 2024
The diagram below shows a mitochondrion.
Which letter represents the mitochondrial matrix?
Did this page help you?
The diagram shows the four stages of respiration.
Which row correctly identifies the stages represented in the diagram?
1 | 2 | 3 | 4 | |
A | Glycolysis | The link reaction | The Krebs cycle | The electron transport chain |
B | The Krebs cycle | Glycolysis | The link reaction | The electron transport chain |
C | The Krebs cycle | The link reaction | Glycolysis | The electron transport chain |
D | The Krebs cycle | The electron transport chain | The link reaction | Glycolysis |
Did this page help you?
The image shows one of the processes of respiration.
Identify the molecule labelled A.
A co-transport protein
A phospholipid
ATP synthase
DNA polymerase
Did this page help you?
Which process is not part of glycolysis?
Pyruvate is oxidised and decarboxylated
Triose phosphate is oxidised to glycerate-3-phosphate
Fructose bisphosphate is split to form two molecules of triose phosphate
NAD is reduced to form NADH + H+
Did this page help you?
In 1961 Peter Mitchell proposed a theory which resulted in a paradigm shift in the field of bioenergetics.
Which theory did he develop?
The function of REDOX reactions in the electron transport chain
The function of oxygen as the final electron acceptor
The function of chemiosmosis in synthesis of ATP
The importance of the link reaction in progressing from anaerobic to aerobic respiration
Did this page help you?
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 |
Did this page help you?
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⁺
Did this page help you?
Which statements correctly describe phosphorylation and dephosphorylation reactions?
I and II
II and III
I and IV
II and IV
Did this page help you?
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 |
Did this page help you?
The diagram below shows a simplified Krebs cycle.
How many times does decarboxylation occur during the Krebs cycle?
Once
Twice
Three times
Four times
Did this page help you?
Which of the following is true of oxidative phosphorylation?
I, II, and IV
II and IV
I, II, and III
I, II, III, and IV
Did this page help you?
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 |
Did this page help you?
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.
Did this page help you?
The diagram below shows a mitochondrion.
Where in this organelle is ATP synthase found?
Did this page help you?
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 |
Did this page help you?
In an investigation into the impact of enzyme inhibition on respiration, scientists used a molecule to inhibit transcription of the gene that codes for the enzyme LDHA.
Using the diagram, identify the likely effect this would have on the process of respiration.
I, II and III
I only
II and III
II only
Did this page help you?
The diagram shows the electron transport chain in the membrane of the mitochondria.
Cyanide is a poison which causes cell death through inhibition of the final electron transport protein when it binds as shown in the diagram.
Which statements correctly describe the impact of cyanide binding to the final transport protein.
I, II and IV only
II and IV only
I and II only
II, III and IV
Did this page help you?
From each molecule of substance X (in the diagram), how many molecules of ATP can be produced?
17
34
36
18
Did this page help you?
Which of the following statements about the Krebs cycle are correct?
II, III and IV
I, II and III
II and III only
III and IV only
Did this page help you?
The following steps describe processes involved in oxidative phosphorylation.
Which of the following shows the correct sequence for these steps?
1 → 4 → 6 → 2 → 5 → 7→ 3
3 → 4 → 6 → 1 → 5 → 7→ 2
3 → 6 → 1→ 5 → 7→ 2 → 4
6 → 3 → 5 → 7→ 2→ 4 → 1
Did this page help you?