2.1 Metabolic Pathways

Question 1

Metabolic Pathways

Answer 1

Integrated series of enzyme-controlled reactions

Question 2

Anabolic reactions

Answer 2

Build complex molecules from simple building blocks and require energy

Question 3

Catabolic reactions

Answer 3

Break down complex molecules into simple building blocks and release energy

Question 4

Types of metabolic pathways

Answer 4

Reversible- Fermentation in animals

Irreversible- Fermentation in plants and yeast

Alternative routes

Question 5

Membrane structure

Answer 5

Pores- allows diffusion of specific molecules across membrane

Pumps- transports molecules against the concentration gradient

Enzymes- speed up rate of biochemical reactions in cell

Question 6

Induced fit

Answer 6

Substrate has high affinity for active site to allow it to bind together

Active site changes shape to better fit the substrate

Products formed have lower affinity for active site to allow it to leave

Enzyme can return to its original shape and is ready to bind with another substrate

Question 7

Control of metabolic pathways- Inhibition

Answer 7

Inhibitors decrease rate of enzyme controlled reaction

Competitive inhibitor- blocks active site so substrate can’t bind

Non competitive inhibitor- binds to another part of enzyme which indirectly changes shape of active site

Feedback inhibitor- concentration of end product builds up so it binds to the enzyme