Higher Biology Unit 2. KA1: Metabolic Pathways

What is a metabolic pathway?

• A method of transporting molecules across a cell membrane

• A type of cellular organelle

• A single chemical reaction in a cell

• A series of enzyme-controlled reactions

What are anabolic reactions?

• Reactions that break down complex molecules into simpler ones

• Reactions that require energy to break down molecules

• Reactions that release energy

• Reactions that build up complex molecules from simpler ones

What is NOT a function of membrane proteins?

• Binding to substrates and changing their structure

• Speeding up the rate of metabolic pathways

• Acting as enzymes for reactions

• Transporting molecules and ions through the membrane

What is the role of enzymes in metabolic pathways?

• To provide energy for reactions

• To inhibit reactions from occurring

• To transport molecules across cell membranes

• To speed up the rate of reactions

What does the 'induced fit' model describe?

• The breakdown of substrates into products

• The movement of molecules through protein pores

• The flexibility of the active site of an enzyme

• The process of competitive inhibition

What is the effect of non-competitive inhibitors on enzymes?

• They increase the rate of reaction

• They change the shape of the active site permanently

• They compete with the substrate for the active site

• They bind to the substrate instead of the enzyme

What is the main difference between competitive and non-competitive inhibitors?

• Non-competitive inhibitors increase the rate of reaction, while competitive inhibitors do not

• Non-competitive inhibitors affect the structure of the substrate, while competitive inhibitors do not

• Competitive inhibitors are reversible, while non-competitive inhibitors are not

• Competitive inhibitors bind to the active site, while non-competitive inhibitors do not

What is feedback inhibition?

• A process where the product of a reaction inhibits the enzyme that produced it

• A method of increasing the rate of a reaction

• The inhibition of an enzyme by a competitive inhibitor

• The binding of a substrate to an enzyme's active site

What is the role of ATP in metabolic reactions?

• It acts as a competitive inhibitor

• It is a product of catabolic reactions

• It provides energy for anabolic reactions

• It changes the shape of the enzyme's active site

What is the significance of the fluid mosaic model?

• It describes the structure of metabolic pathways

• It explains the process of protein synthesis

• It illustrates the flexibility of the cell membrane

• It outlines the steps of cellular respiration