Respiration Practice Questions

Complete the word equation for aerobic respiration.

glucose + ................................ $\rightarrow$ ................................ + water

Respiration is described as an exothermic reaction.

What is meant by an exothermic reaction?

Give two uses of the energy transferred by respiration in the gerbil.

Name the sub-cellular structure in which most aerobic respiration takes place.

Complete the word equation for anaerobic respiration in a human muscle cell.

glucose $\rightarrow$ ................................

Name the two products of anaerobic respiration in a yeast cell.

Give one reason why the leg muscles of a sprinter respire anaerobically during a 100 m race.

What name is given to anaerobic respiration in yeast?

Explain why the dough rises while it is left in the warm place.

Yeast produces ethanol in the dough, but the baked bread contains almost no ethanol.

Suggest why.

A brewer uses the same species of yeast to make beer. The brewer seals the fermentation vessel so that air cannot enter.

Explain why.

Calculate the percentage increase in the swimmer's heart rate during exercise.

Calculate the total volume of air breathed in each minute during exercise.

Give the unit.

Explain why the swimmer's breathing rate and breath volume increase during exercise.

Anaerobic respiration in a muscle cell transfers much less energy per glucose molecule than aerobic respiration.

Explain why.

Give one advantage to a sprinter of being able to respire anaerobically.

Give one way in which anaerobic respiration in a yeast cell is different from anaerobic respiration in a human muscle cell.

Name the two types of molecule that are joined together to make one lipid molecule.

A plant root absorbs nitrate ions from the soil. The plant uses glucose and nitrate ions to make amino acids.

What are the amino acids used to synthesise?

Name the carbohydrate that is made from glucose and stored in human liver and muscle cells.

A person eats far more protein than their body needs. The excess protein cannot be stored.

Describe what happens to the excess protein in the body.

Calculate the mean rate of carbon dioxide production at 40 °C, in $\mathrm{cm^3}$ per minute.

Explain the result obtained at 50 °C.

Suggest one change the student could make to the flask contents to make sure the yeast respired anaerobically.

Lactic acid built up in the cyclist's leg muscles while she was cycling hard.

Explain why.

The cyclist's oxygen uptake stayed above her resting value for about 10 minutes after she stopped cycling.

Explain why.

An athlete runs a 400 m race at maximum effort. By the end of the race his legs ache and he cannot keep running. He continues to breathe deeply and quickly for several minutes after the race has finished.

Explain the changes that take place in the athlete's body during and after the race.