AQA GCSE Biology Bioenergetics Exam| Questions
Answered 100% Correct
What is the symbol equation for aerobic respiration? - ANSWER C6H12O6 + 6O2 -> 6CO2 +
6H2O (+ ENERGY)
Where do most of the reactions for aerobic repiration occur? - ANSWER inside mitochondria
What is anaerobic respiration? - ANSWER respiration without oxygen
When does anaerobic respiration take place in muscles? - ANSWER when you do vigorous
exercise and your body is unable to supply oxygen quickly enough
Which type of respiration transfers the least energy? - ANSWER anaerobic respiration transfers
the least energy because glucose is not fully broken down
Give a word equation for anaerobic respiration in muscles. - ANSWER glucose -> lactic acid (+
ENERGY)
Give a word equation for anaerobic respiration in plants and yeast. - ANSWER glucose ->
ethanol + carbon dioxide (+ ENERGY)
What is anaerobic respiration in yeast cells called? - ANSWER FERMENTATION
Why is fermentation economically important? - ANSWER because it helps the food and drink
industry
Why do you need more energy when you exercise? - ANSWER because exercise requires
your muscles to be able to contract and relax to allow movement, this requires energy
, Describe what happens to the heart rate, breathing rate and breathing volume during exercise and
explain why this happens. - ANSWER more oxygen and glucose needed in muscles for faster rate of
respiration. Faster breathing rate and deeper/bigger breathing volume supplies more
oxygen. Faster heart rate pumps blood more quickly to carry oxygen from lungs and glucose
from intestines to muscles
What is meant by the term oxygen debt? - ANSWER when you finish exercising anaerobically
you continue breathing faster because you need to break down the toxic lactic acid that was
made, which requires oxygen
Describe the role of oxygen in the removal of lactic acid from the muscles. - ANSWER oxygen
oxidises lactic acid breaking it down into carbon dioxide and water
Describe the role of the blood in the removal of lactic acid from the muscles. - ANSWER Blood
supplies the oxygen needed to breakdown the lactic acid and then removes the carbon dioxide
made
What is metabolic rate - ANSWER The rate at which all the chemical reactions take place in the
body
What is the difference between starch cellulose in terms of their function? - ANSWER Starch is a
storage molecule. Soluble glucose is converted to insoluble starch so osmosis does not occur.
Cellulose is the strong substance in plant cell walls that provide regidity.
Write the word equation for photosynthesis - ANSWER carbon dioxide+ water -> oxygen
+ glucose
Write the symbol equation for photosynthesis. - ANSWER 6CO2 + 6H2O -> C6H12O6 + 6O2
Name 4 factors that can affect the rate of photosynthesis. - ANSWER LIGHT
CONCENTRATION
Answered 100% Correct
What is the symbol equation for aerobic respiration? - ANSWER C6H12O6 + 6O2 -> 6CO2 +
6H2O (+ ENERGY)
Where do most of the reactions for aerobic repiration occur? - ANSWER inside mitochondria
What is anaerobic respiration? - ANSWER respiration without oxygen
When does anaerobic respiration take place in muscles? - ANSWER when you do vigorous
exercise and your body is unable to supply oxygen quickly enough
Which type of respiration transfers the least energy? - ANSWER anaerobic respiration transfers
the least energy because glucose is not fully broken down
Give a word equation for anaerobic respiration in muscles. - ANSWER glucose -> lactic acid (+
ENERGY)
Give a word equation for anaerobic respiration in plants and yeast. - ANSWER glucose ->
ethanol + carbon dioxide (+ ENERGY)
What is anaerobic respiration in yeast cells called? - ANSWER FERMENTATION
Why is fermentation economically important? - ANSWER because it helps the food and drink
industry
Why do you need more energy when you exercise? - ANSWER because exercise requires
your muscles to be able to contract and relax to allow movement, this requires energy
, Describe what happens to the heart rate, breathing rate and breathing volume during exercise and
explain why this happens. - ANSWER more oxygen and glucose needed in muscles for faster rate of
respiration. Faster breathing rate and deeper/bigger breathing volume supplies more
oxygen. Faster heart rate pumps blood more quickly to carry oxygen from lungs and glucose
from intestines to muscles
What is meant by the term oxygen debt? - ANSWER when you finish exercising anaerobically
you continue breathing faster because you need to break down the toxic lactic acid that was
made, which requires oxygen
Describe the role of oxygen in the removal of lactic acid from the muscles. - ANSWER oxygen
oxidises lactic acid breaking it down into carbon dioxide and water
Describe the role of the blood in the removal of lactic acid from the muscles. - ANSWER Blood
supplies the oxygen needed to breakdown the lactic acid and then removes the carbon dioxide
made
What is metabolic rate - ANSWER The rate at which all the chemical reactions take place in the
body
What is the difference between starch cellulose in terms of their function? - ANSWER Starch is a
storage molecule. Soluble glucose is converted to insoluble starch so osmosis does not occur.
Cellulose is the strong substance in plant cell walls that provide regidity.
Write the word equation for photosynthesis - ANSWER carbon dioxide+ water -> oxygen
+ glucose
Write the symbol equation for photosynthesis. - ANSWER 6CO2 + 6H2O -> C6H12O6 + 6O2
Name 4 factors that can affect the rate of photosynthesis. - ANSWER LIGHT
CONCENTRATION
