Syllabus Edition
First teaching 2023
First exams 2025
Which of the following statements about cellular respiration is correct?
Cellular respiration involves the conversion of ADP and phosphate to form ATP.
Cellular respiration involves the conversion of ATP to ADP and phosphate.
Cellular respiration always produces carbon dioxide.
Cellular respiration is the controlled release of energy from inorganic compounds.
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The apparatus shown can be used to measure the rate of oxygen consumption of germinating seeds during aerobic respiration.
What would happen to the coloured liquid in the capillary tube when the seeds respire?
The fluid moves towards the seeds.
The fluid expands due to an increase in temperature.
The volume of the fluid decreases as oxygen is being used up.
The fluid moves away from the seeds.
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Which of the following statements are correct?
I, II, and IV
III and IV
II and IV
IV
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What happens when ATP is converted to ADP?
A net release of energy.
A net amount of energy is destroyed.
It can never be reconverted to ATP.
A phosphate is added.
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The diagram below shows a respirometer used to measure the respiration rate of germinating bean seeds.
What direction will the manometer fluid move and what is the role of the liquid placed in the bottom of each tube?
| Direction of movement of the manometer fluid | Role of liquid at the bottom of the tubes | |
| A | Up the left side | To release energy |
| B | Down the right side | To absorb carbon dioxide |
| C | Down the left side | It is the independent variable |
| D | Down the right side | To react with the oxygen produced |
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The rate of oxygen consumption was compared in yeast cells incubated with and without glucose at three different temperatures under aerobic conditions. The yeast cells were incubated for a period of 3 minutes during which the rate of O2 consumption was measured with an O2 sensor.
What can be concluded from the results of this experiment?
Glucose affects the rate of oxygen consumption at higher temperatures less than it does at lower temperatures.
Rate of cell respiration increases with temperature.
Glucose is broken down faster at 55oC.
Yeast does not break down glucose at lower temperatures.
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Which of the following require ATP?
I, II, and IV
III and IV
II and IV
IV
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Which of the following statements correctly describe aerobic and anaerobic cell respiration in some organisms?
| Aerobic cell respiration | Anaerobic cell respiration | |
| A | Products are carbon dioxide and water | Does not produce ATP |
| B | Much higher number of ATP molecules produced | Completely oxidizes glucose |
| C | Lipids and proteins can also be used as substrates | Products are lactate and ATP |
| D | Occurs in the cytoplasm | Occurs in the mitochondria |
Which of the following is not an ethical consideration you should take when working on experiments that use a respirometer to measure respiration rate?
All hazards should be minimized. The animal should not suffer pain, be harmed, or be put at risk in any way.
Animals should be returned to their natural habitat as soon as data is collected.
If an alternative method exists that uses animals instead of plants, it should be used as it provides more accurate data.
It is important to carefully weigh the benefit of learning with the potential harm and choose the most appropriate and ethical method.
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The diagram shows a typical respirometer set-up.
What is the solution at the bottom of the tubes and what is its function?
| Solution | Function | |
| A | Acid | To ensure equal volumes of air in both tubes. |
| B | Acid | To accurately measure the amount of carbon dioxide consumed. |
| C | Alkali | To protect the organism. |
| D | Alkali | To absorb carbon dioxide. |
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Which of the following statements would be a perceived advantage of ATP?
I. ATP is a stable molecule.
II. Acts as an instant source of energy for the cell.
III. It is a universal energy carrier and can be used in many chemical reactions.
IV. It is a small mobile molecule which can be easily transported to other cells.
I. II. III. and IV.
I. and II.
II. and III.
II. III. and IV.
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A respirometer was used to investigate the rate of oxygen consumption in aerobic respiration by germinating seeds. The apparatus used in the investigation are shown.
Which of the following statements about the use of respirometers are correct?
I. There are ethical concerns with using any live organism.
II. The water bath is maintained at 25•C because slight variations in temperature can affect air pressure.
III. The temperature of the water bath can be altered to investigate how temperature affects the rate of respiration.
IV. As CO2 is absorbed by the KOH, the air pressure is reduced inside the sealed chamber (labelled 2).
I. II. and IV.
II. III. and IV.
I. III. and IV.
I. II. III. and IV.
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1 markSome students were investigating the production of carbon dioxide from anaerobic respiration in yeast at different temperatures. They had access to the apparatus to carry out two different methods.
Method 1: Using a gas syringe, students collected gas produced by yeast at different temperatures.
Method 2: Using limewater and a delivery tube, students counted the number of bubbles of gas produced by the yeast at different temperatures, and used limewater to show that it was carbon dioxide.
Which method should the students use and why?
Method 1 should be used because a statistical analysis can be carried out on method 1 but not method 2
Method 2 proves that the gas produced is carbon dioxide, this gives more valid results
Method 1 should be used because it provides quantitative measurements, which will be more accurate
Method 2 should be used because it gives qualitative and quantitative results so is more accurate
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