Higher Biology unit 2 metabolic pathways

What is the name of the molecules the cell uses to directly control metabolic pathways

• products

• enzymes

• substrates

___ reactions build up complex molecules from simple ones and ___ energy

___ reactions break down complex molecules into simple ones and ___ energy

When the enzyme binds to the substrate, what happens to the activation energy of the reaction?

• The activation energy is decreased

• The activation energy is increased

• The activation energy stays the same

• The activation energy increases then levels off

Name the type of inhibition that occurs when an inhibitor molecule binds to the active site of the enzyme and stops the substrate from binding?

• competitive inhibition

• non-competitive inhibition

• Feedback inhibition

• negative feedback loop

What is the type of inhibition that occurs when an inhibitor binds to a different part of the enzyme and changes the active site shape?

• Competitive inhibition

• Non-competitive inhibition

• Feedback inhibition

• negative feedback loop

Which coloured line indicates the reaction rate of a non-competitive inhibitor?

• purple

• orange

• green

Which coloured line indicates the reaction rate of a competitive inhibitor?

• purple

• orange

• green

What term describes an end product in a metabolic pathway binding to an enzyme at the start of a metabolic pathway in order to stop the process?

• competitive inhibition

• feedback inhibition

• saturation point

• non competitive inhibition

The diagram shows the citric acid cycle. Compound Y is what?

• pyruvate

• Oxaloacetate

• citrate

• glucose