Exam code: 0610 & 0970
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Glucose is broken down in the chemical processes of aerobic respiration.
Which row of the table below shows the correct products of this breakdown?
| energy | water | lactic acid | carbon dioxide |
A | X | X | ✔ | X |
B | ✔ | X | X | ✔ |
C | X | ✔ | X | ✔ |
D | ✔ | ✔ | X | ✔ |
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Which of the following is the correct word equation for aerobic respiration in plants?
glucose + oxygen → carbon dioxide + water
carbon dioxide + water → glucose + oxygen
glucose + water → carbon dioxide + oxygen
glucose + carbon dioxide → water + oxygen
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Which of the following processes require, and are dependent on, the activity of enzymes?
aerobic respiration
glucose → lactic acid
osmosis
anaerobic respiration in yeast
1 and 2
1 and 3
1, 2 and 4
All of them
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A student investigated respiration in yeast. They set up the experiment as shown in the diagram below.
Every 30 minutes they replaced the water with the same volume but it was 10 oC warmer and counted the bubbles given off in 2 minutes.
What are the independent and dependent variables in this experiment?
| independent | dependent |
A | number of bubbles | time |
B | time | number of bubbles |
C | water temperature | number of bubbles |
D | water temperature | volume of water |
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Which of the following do humans require energy for?
Producing proteins
Cell division
Generation of nerve impulses
Maintaining body temperature
1 & 3
2, 3 & 4
4 only
All of the above
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What is produced by anaerobic respiration in humans?
alcohol | carbon dioxide | lactic acid | |
A | x | ✔ | ✔ |
B | ✔ | ✔ | x |
C | x | x | ✔ |
D | ✔ | x | x |
key ✔ = yes x = no
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Substances involved in aerobic respiration are listed.
1 carbon dioxide
2 glucose
3 oxygen
4 water
Which substances are used during aerobic respiration?
1 and 3
1 and 4
2 and 3
2 and 4
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What is the balanced chemical equation for anaerobic respiration in yeast?
C6H12O6 → 2CO2 + 6H2O
C6H12O6 → 6CO2 + 6H2O
C6H12O6 → 2C2H5OH + 2CO2
C6H12O6 → 2C2H5OH + 2H2O
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Which equation is aerobic respiration?
6CO2 + 6H2O → 6C6H12O6 + 6O2
6O2 + 6CO2 → 6H2O + C6H12O6
C6H12O6 + 6O2 → 6CO2 + 6H2O
C6H12O6 → 2C2H5OH + 2CO2
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An experiment was conducted to investigate the effect of temperature on respiration in yeast.
10 cm³ of glucose solution was added to 5 g of yeast
A thin layer of oil was added on top of the mixture
The tube was placed in a water bath for 10 minutes and a delivery tube was connected to a gas syringe
Which of the following correctly identify control variables?
temperature and glucose concentration
volume of carbon dioxide produced
amount of yeast and time
volume of yeast and volume of oil added
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Which row in the table below shows the correct products produced by anaerobic respiration in yeast and in animals?
| animals | yeast | ||
lactic acid | carbon dioxide | lactic acid | carbon dioxide | |
A | X | ✔ | X | X |
B | ✔ | X | X | ✔ |
C | X | ✔ | ✔ | X |
D | ✔ | ✔ | ✔ | X |
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During vigorous exercise, such as cycling uphill, lactic acid builds up in the muscles.
How is this lactic acid removed during recovery?
excretion of lactic acid by the kidneys
anaerobic respiration of lactic acid in the muscles
aerobic respiration of lactic acid in the liver
excretion of lactic acid by the lungs
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Why does anaerobic respiration of glucose release less energy in muscle cells than aerobic respiration?
Energy is lost in oxygen.
Energy remains trapped in the chemical bonds in the molecule lactic acid.
Energy remains trapped in the chemical bonds in the molecule ethanol.
Energy is lost in carbon dioxide.
1, 2 and 4
2 only
2 and 3
4 only
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The diagram below shows an experimental set-up which can be used to investigate gas exchange in a plant leaf.
In which direction would the ink drop move and for what reason?
| direction | reason |
A | to the right | photosynthesis |
B | to the left | photosynthesis |
C | to the right | respiration |
D | to the left | respiration |
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The graph below shows the results of an investigation into how the rate of respiration of an organism is affected by changing the temperature.
Which of the following statements would explain the difference between the rate of respiration at 10 °C and that at 30 °C?
Enzyme activity is higher at 30 °C because more frequent collisions are occurring than at 10 °C.
Enzyme activity at 30 °C is lower because the bonds holding an enzyme together are altered at higher temperatures.
Enzyme activity is at its optimum at 30 °C, meaning the rate is at its highest.
Enzyme activity is lower at 10 °C because the enzymes are denatured and therefore unable to bind to their substrates.
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The diagram below shows an experiment set up by a group of students to investigate respiration in yeast.
Which row of the table below correctly describes the contents of the flask after 20 hours?
| new compound | gas produced |
A | ethanol (alcohol) | oxygen |
B | ethanol (alcohol) | carbon dioxide |
C | lactic acid | oxygen |
D | lactic acid | carbon dioxide |
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The diagram below shows an experiment set up by a teacher to demonstrate how an investigation into anaerobic respiration in yeast cells can be carried out.
Predict what would happen to the coloured liquid in the glass tube.
Doesn’t move
Moves to the left
Moves rapidly to the right
Moves slowly to the right
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The list shows some processes that take place in a human body.
production of new red blood cells
transmission of nerve impulses from the eyes to the brain
diffusion of gases into and out of the lungs
Which processes use energy released by respiration?
1 and 2 only
1 and 3 only
2 and 3 only
1, 2 and 3
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Which of the following correctly describes aerobic respiration?
a chemical reaction in cells that uses oxygen to break down nutrient molecules to release energy
a chemical reaction in cells that breaks down glucose without using oxygen
the process of breathing air into and out of the lungs to obtain oxygen
a chemical reaction in cells that produces energy from the breakdown of glucose
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Which of the following shows the word equation for anaerobic respiration in yeast?
glucose → alcohol + carbon dioxide
glucose → lactic acid
glucose + oxygen → carbon dioxide + water
carbon dioxide + water → glucose + oxygen
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Four metabolic reactions that can occur in living organisms are shown below:
C6H12O6 + 6O2 → 6CO2+ 6H2O
glucose → lactic acid
6CO2+ 6H2O → C6H12O6 + 6O2
C6H12O6 → 2C2H5OH + 2CO2
Which of the above reactions take place in yeast cells to release energy?
1 and 2
1 and 3
3 and 4
1 and 4
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Which of the following processes would release the most energy in a cell from one molecule of glucose?
Aerobic respiration in yeast
Aerobic respiration in animals
Aerobic respiration in plants
2 only
3 only
1 & 3
All of the above
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In which conditions would the cells of a dicotyledonous green plant respire?
| mesophyll cell | root hair cell | ||
darkness | bright light | darkness | bright light | |
A | ✔ | X | ✔ | X |
B | X | ✔ | X | X |
C | X | X | X | X |
D | ✔ | ✔ | ✔ | ✔ |
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Which of the following is the correct balanced symbol equation for aerobic respiration in yeast cells?
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O
C6H12O6 → 2 C3H6O3
6 CO2 + 6 H2O → C6H12O6 + 6 O2
C6H12O6 → 2 C2H5OH + 2 CO2
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The list below shows four metabolic processes that can occur in living cells.
carbon dioxide + water → glucose + oxygen
glucose → lactic acid
glucose + oxygen → carbon dioxide + water
glucose → alcohol + carbon dioxide
Which row of the table correctly represents the processes that can occur in muscle cells and yeast cells.
| in muscles | in yeast |
A | 3 only | 1 & 4 |
B | 3 & 4 | 2 & 3 |
C | 2 only | 1, 3 & 4 |
D | 2 & 3 | 3 & 4 |
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The diagram shows the oxygen uptake by germinating seeds at two different temperatures.
At which time is the oxygen uptake at 20 °C four times greater than at 10 °C?
5 minutes
10 minutes
15 minutes
20 minutes
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Which statement correctly compares aerobic and anaerobic respiration in humans?
both aerobic and anaerobic respiration produce carbon dioxide as a product
aerobic respiration produces carbon dioxide and water, whereas anaerobic respiration produces alcohol.
aerobic respiration produces lactic acid, whereas anaerobic respiration produces carbon dioxide and water
aerobic respiration releases more energy per glucose molecule than anaerobic respiration
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Which row correctly completes the balanced equation for anaerobic respiration in yeast?
C6H12O6 → X + Y
X | Y | |
|---|---|---|
A | 2C2H5OH | 2CO₂ |
B | 2C₃H₆O2 | 2O₂ |
C | 2C2H5OH | 2H2O |
D | C₃H₆O2 | C₃H₆O4 |
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