S2 Biological Molecules and Enzymes

Which chemical element is found in proteins, but not in carbohydrates or fats?

• carbon

• hydrogen

• oxygen

• nitrogen

Small molecules are used as the basic units in the synthesis of large food molecules.

Which statement is correct?

• Amino acids are basic units of carbohydrates.

• Fatty acids are basic units of glycogen

• Glycerol is a basic unit of oils.

• Simple sugar is a basic unit of protein.

Tags

NGSS.HS-LS1-6

The diagram shows a protease molecule catalysing the break down of a protein molecule.

Which letter denotes the substrate?

• P

• Q

• R

• S

The diagram shows a protease molecule catalysing the break down of a protein molecule.

Which letter denotes the product?

• P

• Q

• R

• S

The diagram shows a protease molecule catalysing the break down of a protein molecule.

What is P?

• Product

• Substrate

• Active Site

• Denatured

Many enzymes do not work at temperatures above 60 °C.

Which statement explains this?

• Product molecules are not made because the active site has changed shape.

• Product molecules change shape so they do not fit the active site

• Substrate molecules are moving too fast.

• Substrate molecules are moving too slowly.

Which of these are the correct combinations

• iodine solution to test for starch

• biuret test for reducing sugars

• ethanol emulsion test for proteins

• Benedict’s solution to test for reducing sugars

• biuret test for proteins

The most important solvent in biological organisms is

• ethanol

• hydrochloric acid

• water

• acetone

Tags

NGSS.MS-LS2-1

Which graph shows the effect of temperature on the activity of an enzyme?

• A

• B

• C

• D

The graph shows how enzyme activity is affected by temperature.

How can the change in activity between 40 °C and 55 °C be explained?

• Heat has killed the enzyme.

• The enzyme has been used up.

• The reactants are moving faster.

• The substrate is less likely to fit into the active site.