Sign In

Biology for IGCSE & O level - Respiration (Section 3)

1
What is the primary function of the mitochondria in a cell?
Answer
(D)
Aerobic respiration
2
Which of the following are features of anaerobic respiration?
Answer
A
B
C
D
3
What is the role of enzymes in respiration?
Answer
(B)
To speed up the chemical reactions.
4
Which of the following is a characteristic of the Kreb's cycle?
Answer
(C)
It is a part of aerobic respiration.
5
Which of the following is NOT a product of aerobic respiration?
Answer
(D)
Lactic acid
6
During aerobic respiration, the breakdown of glucose requires which of the following?
Answer
(B)
Oxygen
7
Which of the following is required for aerobic respiration?
Answer
A
B
8
What is the word equation for aerobic respiration?
Answer
(A)
Glucose + oxygen -> carbon dioxide + water
9
What is the purpose of the water bath in the experiment to investigate the effect of temperature on yeast respiration?
Answer
(B)
To keep the temperature constant
10
During anaerobic respiration in muscle cells, what is the net gain of ATP per glucose molecule?
Answer
(B)
4
11
During anaerobic respiration in muscle cells, which molecule is the final electron acceptor?
Answer
(D)
There is no final electron acceptor.
12
Which of the following statements are correct about aerobic and anaerobic respiration?
Answer
A
C
D
13
What is the source of energy in a cell?
Answer
(B)
Glucose
14
During vigorous exercise, when muscles respire without oxygen, what is the release?
Answer
(C)
Little energy from each molecule of glucose
15
What is the name of the process where the energy released in respiration is used to produce ATP?
Answer
(D)
Phosphorylation
16
Why is it important to keep the apparatus at a constant temperature when investigating the effect of temperature on respiration in yeast?
Answer
(C)
To control the rate of enzyme reactions.
17
The oxygen debt that occurs after vigorous exercise is due to the buildup of?
Answer
(C)
Lactic acid
18
What is the role of glucose in respiration?
Answer
(B)
To be the fuel
19
During strenuous exercise, which substance builds up in muscle cells due to anaerobic respiration?
Answer
(C)
Lactic acid
20
Which of the following are factors that influence the rate of respiration?
Answer
A
B
C
21
What is the main difference in terms of products between aerobic and anaerobic respiration in yeast?
Answer
(B)
Aerobic: CO2 and water; Anaerobic: alcohol and CO2
22
What is the oxygen debt?
Answer
(A)
The amount of oxygen needed to break down lactic acid.
23
What type of respiration occurs in the presence of oxygen?
Answer
(C)
Aerobic respiration
24
During aerobic respiration, what happens to the energy released from glucose?
Answer
(B)
It is released gradually and used to produce ATP.
25
Which of the following statements is correct about the energy released in respiration?
Answer
(D)
Energy is released in a series of small, enzyme-controlled reactions.
26
Which of the following equations represents anaerobic respiration in muscle cells?
Answer
(B)
C6H12O6 -> 2C3H6O3
27
What is the primary purpose of fermentation in yeast?
Answer
(C)
To produce alcohol and carbon dioxide
28
What are the reactants in the word equation for anaerobic respiration in yeast?
Answer
(A)
Glucose
29
In the apparatus used to measure the rate of respiration by yeast, what does the movement of the colored liquid indicate?
Answer
(B)
The amount of oxygen being used.
30
Which of the following is NOT a use of the energy released during respiration in humans?
Answer
(D)
Absorption of carbon dioxide in the lungs
31
What are some of the uses of energy in a living organism?
Answer
A
B
C
32
Why do sprinters often hold their breath during a 100-meter race?
Answer
(C)
To maximize the use of anaerobic respiration.
33
What are the products of the complete breakdown of glucose during aerobic respiration?
Answer
A
B
34
Which of the following correctly describes the fate of glucose during aerobic respiration?
Answer
A
B
C
35
During respiration, what is the main function of the Electron Transport Chain (ETC)?
Answer
(C)
To produce ATP.
36
During strenuous exercise, why does the body switch to anaerobic respiration in muscle cells?
Answer
(C)
To meet the energy demands when oxygen supply is limited.
37
Which of the following is the end product of anaerobic respiration in yeast?
Answer
(B)
Alcohol
38
Which of the following is a key feature of the oxygen debt after vigorous exercise?
Answer
(B)
Increased heart rate
39
Which of the following is a factor that affects the rate of respiration?
Answer
A
B
C
40
What happens to the muscle cells during a period of strenuous exercise, when not enough oxygen is available?
Answer
B
C
41
Which of the following are produced during anaerobic respiration in human muscle cells?
Answer
(B)
Lactic acid
42
Where in the cell does glycolysis, the first step of respiration, occur?
Answer
(B)
Cytoplasm
43
What substance is required for the complete breakdown of glucose during respiration?
Answer
(B)
Oxygen
44
What happens to the oxygen debt after strenuous exercise?
Answer
(B)
It is removed by breathing heavily.
45
Which of the following are products of fermentation in yeast?
Answer
A
B
46
What is the role of mitochondria in a cell?
Answer
(C)
Aerobic respiration
47
What is the effect of temperature on the rate of respiration?
Answer
(C)
The rate increases as the temperature increases to a certain point.
48
Why does the rate of respiration increase with temperature?
Answer
(B)
Enzymes work faster.
49
Which statement correctly describes the main difference between aerobic and anaerobic respiration?
Answer
(A)
Aerobic respiration produces more energy per glucose molecule than anaerobic respiration.
50
What happens to the rate of respiration as temperature increases (up to an optimal temperature)?
Answer
(C)
The rate increases.