Bioenergetics

Question 1

Name 2 substances that are released as a result of aerobic respiration.

Answer 1

Carbon dioxide

Water

Question 2

What are the symbol equation of aerobic respiration?

Answer 2

C6H12 + O2 —-> CO2 + H2O

Question 3

In mammals, the energy provided by respiration is used to maintain body
temperature.

Describe one other use by mammals of the energy released by
aerobic respiration.

Answer 3

Muscle contraction for movement.

Making Proteins for growth.

Question 4

What is the name of the process that releases energy from glucose in the
absence of oxygen?

Answer 4

Anaerobic respiration

Question 5

The amount of energy released anaerobic respiration is small in comparison to
the amount of energy available in molecules of glucose.

Suggest one advantage of the process, even though it releases a small amount of
energy.

Answer 5

it is quicker/faster or releases energy quicker (despite glucose only being
partially broken down.

Question 6

After the race the athlete breathes heavily for a while.

Explain why.

Answer 6

build up of lactic acid [1]; causes pain/poisonous/toxic [1]

oxygen needed to oxidise/break down lactic acid [1] to carbon dioxide and water [1]

Question 7

A higher breathing rate is beneficial to exercising muscles.

Explain why.

Answer 7

Provides oxygen [1 mark]

For respiration or aerobic respiration [1 mark]

to release/provide energy (no produce energy) [1 mark]

or remove carbon dioxide from the body / blood [1 mark]

Produced by respiration [1 mark]