Anaerobic cellular respiration in humans and other organisms | Combined science

Starter quiz

Which chemical reactions release energy to the surroundings?

'exothermic' ✓
Which is the correct symbol equation for respiration?

6O $_2$ + C $_6$ H $_6$ O $_6$ --> 3H $_2$ O + 6CO $_2$

6O $_2$ + C $_6$ H $_{12}$ O $_6$ --> 6H $_2$ O + 6CO $_2$ ✓

6O $_2$ + C $_6$ H $_6$ O $_6$ --> 12H $_2$ O + 6CO $_2$
Which product is missing from the equation?

'water' ✓
True or false? Prokaryotic and eukaryotic cells carry out respiration.

True ✓

False
In which two places does cellular respiration take place in eukaryotic cells?

cytoplasm ✓

chloroplasts

mitochondria ✓

cell membrane

cell wall
What is ethanol more commonly known as?

'alcohol' ✓

True or false? Anaerobic respiration takes place in the mitochondria of cells.

True

False ✓
What is the correct word equation for anaerobic respiration in yeast?

glucose --> oxygen + water

glucose + oxygen --> water + carbon dioxide

glucose + carbon dioxide --> water + ethanol

glucose --> ethanol + carbon dioxide ✓

glucose + oxygen --> ethanol + water
Which of the following are true about anaerobic respiration?

Anaerobic cellular respiration releases more energy than aerobic respiration.

Anaerobic respiration takes place when there is an excess of carbon dioxide.

Anaerobic cellular respiration releases energy quicker. ✓

Lactic acid is produced by aerobic cellular respiration.

Anaerobic cellular respiration produces ethanol in plants and microorganisms. ✓
Match the symbol equation to its description.

Anaerobic respiration in humans

⇔

C $_6$ H $_{12}$ O $_6$ --> 2C $_3$ H $_6$ O $_3$ ✓

Anaerobic respiration in microorganisms

⇔

C $_6$ H $_{12}$ O $_6$ --> C $_2$ H $_5$ OH + 6CO $_2$ ✓
Oxygen debt is the amount of oxygen necessary to remove ______ from the body after exercise.

'lactic acid' ✓
What are the uses of anaerobic cellular respiration (fermentation) in yeast?

making beer ✓

making bread ✓

making yogurt

making wine ✓

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Word and balanced symbol equations for anaerobic cellular respiration in humans, and conditions in which it occurs.
Word and symbol equations for anaerobic respiration in plants and micro-organisms, and conditions in which it occurs.
Anaerobic cellular respiration takes place only in the cell cytoplasm and does not involve mitochondria.
Anaerobic cellular respiration transfers less energy than aerobic cellular respiration, but more quickly.
Uses of anaerobic cellular respiration (fermentation) in yeast.

Students sometimes think that plants don't respire, and that they (only) photosynthesise instead.

This lesson contains examples of plants respiring.

Cellular respiration - an exothermic chemical process that transfers energy for life processes, using glucose as a fuel
Anaerobic - a process that does not require oxygen
Lactic acid - a product of anaerobic cellular respiration in humans that causes muscle cramps
Oxygen debt - the amount of oxygen necessary to remove lactic acid from the body after exercise
Fermentation - anaerobic cellular respiration in yeast that produces ethanol (a type of alcohol) and carbon dioxide gas