IB Enzymes core

To which region on an enzyme does the substrate bind?

Which of the following is true of enzymes?

• They denature at low temperatures

• The active site is complementary in shape to many substrates

• They are proteins

• The active site is not changed at extremes of pH

What term describes the tempertayre at which enzyme activity is greatest?

What is the missing term? The shape and chemical properties of the active site are highly dependent on the ...................... ........................... of the enzyme

• primary structure

• secondary structure

• tertiary structure

• quaternary structure

Why does the rate of the enzyme catalysed reaction level off?

• There is not enough substrate

• All the active sites are saturated

• The enzymes denature at higher substrate concentrations

• The temperature is too high

Why is the rate of the enzyme catalysed reaction lower at temperatures below the optimum temperature?

• The enzymes have denatured

• The active sites are saturtaed

• The substrate concentration is too low

• There a are fewer collisions between substrate and active site

In an experiment to investigate the effect of temperature on an enzyme cataysed reaction; temperature represents which variable?

• Independent

• Dependent

• Controlled

• Control

In an experiment to investigate the effect of temperature on an enzyme cataysed reaction: The pH is kept constatnt. What type of variable is this?

• Independent

• Dependent

• Controlled

• VALID

Immobilized lactase can be used to produce lactose free milk. What type of carbohydrate is lactose?

• Monosaccharide

• Disaccharide

• Oligosaccharide

• Polysaccharide

Identify the type of reaction catalysed by lactase

• Condensation

• Anabolic

• Hydrolysis

• Endothermic