©BRIGHSTARS 2024/2025 ALL RIGHTS RESERVED.
A-Level PE - Energy Systems Test Questions
And Answers 100% Pass.
Where do we get energy from for muscular contractions? - Answer✔Adenosine Triphosphate
(found in high quantities in carbohydrates)
Where the bonds are broken down to release energy into the body w
What enzyme breaks down ATP? - Answer✔ATPase
Into ADP + Pi
How is re-synthesis of ATP performed? - Answer✔Three chemical reactions within the body
By food or a chemical called phosphocreatine
How does the conversion of fuel to energy occur - Answer✔Use of three energy systems
Aerobic system (glycolysis, krebs and etc)
ATP-PC system
Anaerobic glycolytic system
What is the aerobic system? - Answer✔Exercise is at low intensity and oxygen supply high
Glucose is broken down into co2 and h2o
Oxidation of glucose produces a maximum of 38 ATP
Products of fat and protein digestion are converted to acetyl coenzyme A for entering the krebs
How do you remember the stages of the aerobic system? - Answer✔GKE
GET KINETIC ENERGY
Describe the role of fats in the aerobic system? - Answer✔Fats in the form of fatty acids and
proteins in the form of amino acids are broken down
They are reduced to the acetyl coenzyme A which enters the Krebs cycle
What is glycolysis? - Answer✔A process by which glucose is converted to pyruvate to produce
energy
1|Page
, ©BRIGHSTARS 2024/2025 ALL RIGHTS RESERVED.
Describe the process of glycolysis? - Answer✔First stage is anaerobic and takes place in the
sarcoplasm of the muscle cell
Glucose is broken down into pyruvic acid
Two molecules of ATP produced
What must happen to pyruvic acid before entering the Krebs cycle? - Answer✔Must be oxidised
into two acetyl groups
Then carried into the Krebs cycle
Describe the Krebs cycle? - Answer✔Two acetyl groups will diffuse into the matrix of the
mitochondria
Combine with oxaloacetic acid which forms citric acid
Hydrogen removed from citric acid and undergoes oxidative carboxylation (carbon and hydrogen
given off)
Carbon forms co2 and hydrogen is taken in electron transport chain
Produce two ATP
Describe the electron transport chain? - Answer✔Hydrogen carried to electron transport chain by
hydrogen carriers. This occurs in the cristae of the mitochondria.
Hydrogen splits into hydrogen ions and electrons and are charged with potential energy.
The ions are oxidised to form water, while the electrons provide energy to re-synthesise ATP. 34
molecules of ATP are formed.
What is beta oxidation and why does it occur? - Answer✔Breaking fat down into glycerol and
three fatty acids
It Is then converted to acetyl coenzyme A in beta oxidation
Fat metabolism follows then the same path as glycogen
More ATP is made from on molecule of fatty acid than from glycogen
This is why fatty acids are used in long duration
What are the advantages and disadvantages of an aerobic system? - Answer✔More ATP
produced 36 ATP
No fatiguing by-products (co2 and water)
Lots of glycogen and triglyceride stores so exercise can last for a long period of time
Complicated system so energy not available straight away, it takes a while for o2 to become
available and break down glucose and fatty acids
2|Page
A-Level PE - Energy Systems Test Questions
And Answers 100% Pass.
Where do we get energy from for muscular contractions? - Answer✔Adenosine Triphosphate
(found in high quantities in carbohydrates)
Where the bonds are broken down to release energy into the body w
What enzyme breaks down ATP? - Answer✔ATPase
Into ADP + Pi
How is re-synthesis of ATP performed? - Answer✔Three chemical reactions within the body
By food or a chemical called phosphocreatine
How does the conversion of fuel to energy occur - Answer✔Use of three energy systems
Aerobic system (glycolysis, krebs and etc)
ATP-PC system
Anaerobic glycolytic system
What is the aerobic system? - Answer✔Exercise is at low intensity and oxygen supply high
Glucose is broken down into co2 and h2o
Oxidation of glucose produces a maximum of 38 ATP
Products of fat and protein digestion are converted to acetyl coenzyme A for entering the krebs
How do you remember the stages of the aerobic system? - Answer✔GKE
GET KINETIC ENERGY
Describe the role of fats in the aerobic system? - Answer✔Fats in the form of fatty acids and
proteins in the form of amino acids are broken down
They are reduced to the acetyl coenzyme A which enters the Krebs cycle
What is glycolysis? - Answer✔A process by which glucose is converted to pyruvate to produce
energy
1|Page
, ©BRIGHSTARS 2024/2025 ALL RIGHTS RESERVED.
Describe the process of glycolysis? - Answer✔First stage is anaerobic and takes place in the
sarcoplasm of the muscle cell
Glucose is broken down into pyruvic acid
Two molecules of ATP produced
What must happen to pyruvic acid before entering the Krebs cycle? - Answer✔Must be oxidised
into two acetyl groups
Then carried into the Krebs cycle
Describe the Krebs cycle? - Answer✔Two acetyl groups will diffuse into the matrix of the
mitochondria
Combine with oxaloacetic acid which forms citric acid
Hydrogen removed from citric acid and undergoes oxidative carboxylation (carbon and hydrogen
given off)
Carbon forms co2 and hydrogen is taken in electron transport chain
Produce two ATP
Describe the electron transport chain? - Answer✔Hydrogen carried to electron transport chain by
hydrogen carriers. This occurs in the cristae of the mitochondria.
Hydrogen splits into hydrogen ions and electrons and are charged with potential energy.
The ions are oxidised to form water, while the electrons provide energy to re-synthesise ATP. 34
molecules of ATP are formed.
What is beta oxidation and why does it occur? - Answer✔Breaking fat down into glycerol and
three fatty acids
It Is then converted to acetyl coenzyme A in beta oxidation
Fat metabolism follows then the same path as glycogen
More ATP is made from on molecule of fatty acid than from glycogen
This is why fatty acids are used in long duration
What are the advantages and disadvantages of an aerobic system? - Answer✔More ATP
produced 36 ATP
No fatiguing by-products (co2 and water)
Lots of glycogen and triglyceride stores so exercise can last for a long period of time
Complicated system so energy not available straight away, it takes a while for o2 to become
available and break down glucose and fatty acids
2|Page
