IGCSE B3 & B4 (bio molecules and enzymes)

Which of these is not a biological molecule?

• Carbohydrates

• Proteins

• Lipids

• Carbon dioxide

Which element is not found in carbohydrates?

• Carbon

• Nitrogen

• Oxygen

• Hydrogen

Which element is not common to both proteins and lipids?

• Carbon

• Nitrogen

• Hydrogen

• Oxygen

What is the name of the building block that proteins are made from?

• Amino Acid

• Fatty acid

• Glycerol

• Simple sugar

Tags

NGSS.HS-LS1-1

NGSS.HS-LS1-6

Starch is a carbohydrate. Which building block is starch made from?

• Amino acids

• Fatty acids

• Glycerol

• Simple sugars

Which solutions are used to test for the presence of carbohydrates?

• Buiret

• Benedict's

• Iodine

• Ethanol

If a solution tested positive for proteins, what colour would it turn?

• Green/yellow/orange/red

• cloudy white

• blue/black

• purple/lilac

Which of the following factors would not affect the rate of an enzyme-controlled reaction?

• Temperature

• pH

• Concentration of enzyme

• Concentration of product

• Concentration of substrate

Which statement is true about enzymes?

• The shape of an enzyme's active site matches the shape of its substrate

• Enzymes are used up in biological reactions

• Enzymes work faster at higher temperatures

• Every enzyme has one specific substrate that it breaks down or builds up.

The graph shows the effect of temperature on an enzyme. Which statement explains the trend from 10-70^oC?

• As temperature increases, enzyme activity increases

• 70^oC is the optimum temperature for this enzyme

• As temperature increases, enzymes become denatured.

• As temperature increases, enzyme activity decreases.

• As temperature increases, molecules gain more kinetic energy and have more successful collisions