Just Another Ph-ase

Enzyme reactions can be both catabolic and anabolic.

True or false?

• True

• False

Which is incorrect?

• Most enzymes are proteins that are substrate-specific

• Enzymes have a groove on their surface that contains active sites

• Enzymes are catatonic

• Many factors can affect the effectiveness of enzymes

Select the most accurate list of factors that inhibit enzyme functionality.

• temperature, osmotic pressure, oxygen availability

• sugar concentration, pH, time

• inhibitors, the concentration of reactants and products

• cofactor presence, salt availability, energy levels

The induced fit model (Koshland, 1996) is a more accurate explanation of enzyme function than the lock and key model.

• True

• False

How does temperature affect enzyme activity?

• High temperatures increase the amount of activation energy required

• Low temperatures denature enzymes

• Low temperatures affect the weak hydrogen bonds

• High temperatures permanently alter the 3D structure of enzymes

How does pH affect enzyme activity?

• It can interfere with the folding process of enzymes

• By causing the enzyme to attract alkaline metals

• Extreme pH causes the enzyme to relocate and become lost

• It causes enzymes to change their active sites

How do inhibitors affect enzyme activity?

• Through competitive inhibition by attaching to another site on the enzyme, changing the shape of the active site

• Through non-competitive inhibition by attaching to another site on the enzyme, changing the shape of the active site

• Through competitive inhibition by attaching to another site on the enzyme, changing the shape of the active site

• Inhibitors do not affect enzyme activity in any way.

Only certain chemical reactions require activation energy to initiate the reaction.

True or False?

• True

• False

Which is incorrect?

• When the active site of an enzyme binds to a substrate, an enzyme-substrate complex is formed.

• Enzymes are made of carbon, hydrogen, oxygen and nitrogen.

• The mitochondria does not have any enzymes present.

• Enzymes are substrate-specific catalysts.

Which letter represents the product?

• A

• B

• C

• D

• E