Proteins and Enzymes

A reaction takes place because the active site of an enzyme is complementary to

• one type of substrate molecule

• all types of substrate molecule

• one type of product molecule

• all types of product molecules.

Enzymes act as catalysts because they

• are composed of protein

• act on any substrate

• are unaffected by temperature

• speed up chemical reactions in cells.

All enzyme molecules are composed of

• carbohydrates

• fatty acids

• glycerol

• proteins

Proteins have different functions. Which of the following statements identifies a protein and its function?

• Hormones carry oxygen around the body.

• Enzymes carry chemical messages around the body

• Antibodies defend the body against disease.

• Cellulose provides strength and structure to a plant cell wall.

Which of the following are all types of proteins?

• Hormones, enzymes and nitrates

• Antibodies, enzymes and plasmids

• Hormones, receptors and antibodies

• Receptors, antibodies and nitrates

The substrate of catalase would be

• Hydrogen peroxide

• Glucose-1-phosphate

• oxygen and water

• Maltose

Which of these are proteins

• Hormones

• Antibodies

• Receptors

• Enzymes

Synthesis reactions are breaking down reactions

• TRUE

• FALSE

How can we make experiment results more reliable?

Glucose-1-phoshate is synthesised into starch by which enzyme?

• Amylase

• Catalase

• Phosphorylase

• Lactase