Unit 3 Topics 3.1 and 3.2 Quiz Review

What is the primary role of enzymes in biochemical reactions?

• To increase the activation energy of reactions

• To lower the activation energy of reactions

• To denature substrates

• To provide energy for reactions

Tags

NGSS.HS-LS2-3

Which model explains the slight change in enzyme shape upon substrate binding?

• Lock and key model

• Induced-fit model

• Transition state model

• Competitive inhibition model

What happens to enzymes at temperatures beyond their optimal range?

• They become more efficient

• They denature, losing their structure

• They bind substrates more tightly

• They stop releasing products

Which factor does NOT affect enzyme activity?

• Temperature

• pH

• Substrate concentration

• Enzyme size

What is the role of competitive inhibitors in enzyme regulation?

• They bind to the allosteric site

• They block the active site

• They increase enzyme activity

• They stabilize the transition state

What is another name for a "catalyst" in a biochemical process that occurs in organisms?

• substrate
• inhibitor
• enzyme
• cofactor

How does this graph illustrate the effect temperature has on enzyme activity?

• Temperature has no effect on enzyme activity.
• Enzyme activity increases indefinitely with temperature.
• Temperature affects enzyme activity by increasing it to an optimum level, after which it decreases due to denaturation.
• Enzymes are only active at low temperatures.

How do enzymes help living organisms metabolize food?

• Enzymes store energy from food for later use.
• Enzymes create new nutrients from waste products.
• Enzymes slow down the digestion process to conserve energy.
• Enzymes help living organisms metabolize food by speeding up chemical reactions that break down nutrients into usable forms to get energy quicker.

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-5

In order for an enzyme to be effective, it must do what to the substrate?

• Keep the substrate's chemical structure the same

• Inhibit the substrate
• Bind to the substrate, transform the substrate into products and release the products.

• Break down the substrate into reactants

What allows for this enzyme to affect this substrate in a reaction?

• The enzyme's active site forms a complementary shape to the substrate.
• The substrate is always larger than the enzyme.
• The enzyme changes the substrate's chemical structure directly.
• The enzyme's active site is rigid and does not change shape.