2.1-2 HBIO

metabolic pathways, the rates of reaction can be affected by the presence of enzyme inhibitors.

Which row in the table below is correct?

• A

• B

• C

• D

Stages of aerobic respiration are shown below.

1 Glycolysis

2 Citric acid cycle

3 Electron transfer chain

Which stage(s) involve(s) both phosphorylation of intermediates and generation of ATP?

• 1 only

• 3 only

• 1 and 2 only

• 1 and 3 only

Which row in the table below identifies a stage of aerobic respiration, its site and an event which occurs during that stage?

• A

• B

• C

• D

The following statements describe some features of enzyme inhibition.

1 The inhibitor binds to the active site.

2 The effect of the inhibitor is reduced by increasing the substrate concentration.

3 The inhibitor is non-competitive.

Which of these statements apply to the inhibitor shown in the diagram?

• 1 only

• 3 only

• 1 and 2 only

• 2 and 3 only

Which row in the table describes reaction 1 and 2?

• 1-catabolic and energy released

  2-anabolic and energy required

• 1-anabolic and energy released

  2-catabolic and energy required

• 1-catabolic and energy required

  2-anabolic and energy released

• 1-anabolic and energy required

  2-catabolic and energy released

The following substances are products of fermentation.

1 ATP

2 Lactate

3 Carbon dioxide

Which of these are products of fermentation in human muscle cells?

• 2 only

• 1 and 2 only

• 2 and 3 only

• 1, 2 and 3

What is a metabolic pathway

Answer explanation

Metabolic pathways are integrated and controlled pathways of enzyme-catalysed reactions within a cell.//Metabolic pathways can have reversible steps, irreversible steps and alternative routes.

Structures of membrane

• Protein pores

• Protein pumps

• Enzymes

• Cytoplasm

occurs when the active site changes shape to better fit the substrate after the substrate binds.

The substrate molecule(s) have a ____ affinity for the active site and the subsequent products have an ____ affinity, allowing them to leave the active site.

• High

  Low

• Low

  high

• Low

  Low

• High

  High