Living Environment Enzymes

Students did an experiment comparing the activity of four different enzymes, A, B, C, and D. The results are represented in the graph below. A valid conclusion based on the information in the graph is that

• the pH of some enzymes changes as the temperature changes

• enzymes change color in proportion to the rate of activity

• a difference in the pH of an environment changes enzyme activity

• enzyme activity causes acids to change into bases over time

The Venus flytrap is a plant that has a unique system by which it traps and breaks down its prey. Unsuspecting insects land on the leaf and touch tiny hairs located on the leaf, triggering the leaf to close around the prey. The substance responsible for breaking down the Venus flytrap’s prey most likely contains

• chlorophyll molecules

• glucose molecules

• hormone molecules

• enzyme molecules

Tags

NGSS.MS-LS1-2

To capture their prey, spiders have fangs, which pierce the body wall of insects and inject venom. Spider venoms usually contain specific proteins that attack the cell membranes of the prey. The membranes and most of the contents of the insect’s body turn into a liquid that the spider then ingests for food. These specific venom proteins are most likely

• ATP molecules

• DNA molecules

• biological catalysts

• regulatory hormones

What happens when enzymes are heated to a high temperature?

• The enzymes die.

• The shapes of the enzyme are altered or denatured

• The enzymes' amino acid sequence changes.

• The enzymes remain the same

Choose which two describe the lock and key model of an enzyme's function

• Interaction between the enzyme's inactive site and the substrate.

• The substrate remains the same, the enzyme changes.

• The enzyme remains the same, the substrate changes.

• Interaction between the enzyme's active site and the substrate.

Which of these factors can affect the initial rate of an enzyme reaction?

• Enzyme concentration

• Substrate concentration

• Temperature

• pH

• All of the above

What is the purpose of an enzyme?

• give permission for the reaction

• raise activation energy

• speed up chemical reactions

• control how many reactions occur

Enzymes need certain environmental conditions in order to function properly. What happens when enzymes are taken out of those optimal conditions?

• they die

• they denature

• they change their amino acid sequence

• they work better

What happens when enzymes are heated to a high temperature?

• they die

• they denature

• they change their amino acid sequence

• they work better

What is the primary substance that enzymes act upon?

• Products

• Reactants

• Substrates

• Catalysts