Enzymes & ATP

The energy needed to get a reaction started is the

• adhesion energy

• activation energy

• cohesion energy

• chemical energy

Enzymes affect the reactions in living cells by changing the

• products of the reaction

• speed of the reaction

• temperature of the reaction

• pH of the reaction

What are the three parts of an ATP molecule?

• adenine, thylakoid, and a phosphate group

• stroma, grana, and chlorophyll

• adenine, ribose, and three phosphate groups

• NADH, NADPH, FADH2

Energy is released from ATP when

• a phosphate group is added.

• adenine bonds to ribose.

• ATP is exposed to sunlight.

• a phosphate group is removed.

Which phrase best describes the function of the ATP molecule?

• absorbs energy

• increases energy

• stores energy

• creates energy

Where does your body get the energy for reattaching a third phosphate to ADP, creating ATP?

• from the sun

• usually from carbs

• from nucleic acids

• from breaking bonds

If a reaction in one direction releases energy, the reaction in the opposite direction

• also releases energy

• absorbs energy

• destroys energy

• cannot occur

Chemical reactions that absorb more energy than they release are called

• exothermic

• catalyzed

• endothermic

• activated

A substance that is acted upon by an enzyme is called a(n)...

• coenzyme

• vitamin

• substrate

• polypeptide

In the lock-and-key model of enzyme function, what is happening during step 2?

• The catalyzed reaction is releasing a product

• The enzyme is breaking bonds in the substrate

• The enzyme leaves the bonds between the substrates

• The substrates are beginning to bind to the enzyme