Unit 3 Enzymes & ATP Quiz

A catalyzed reaction will have a __________ activation energy, and this leads to a(n) __________ in the reaction rate.

• lower, decrease

• lower, increase

• higher, decrease

• higher, increase

Tags

NGSS.HS-PS1-5

In the picture of the enzyme substrate complex, what is happening during step 2 (the middle step)?

• The catalyzed reaction is releasing a product

• The enzyme is breaking bonds in the substrate

• The enzyme is making bonds between the substrates

• The substrates are beginning to bind to the enzyme

Tags

NGSS.HS-PS1-2

In the included picture, what do C and D represent?

• Substrates

• Reactants

• Active sites

• Products

Tags

NGSS.HS-PS1-2

If a reaction in one direction releases more energy than it absorbs, that same reaction in the opposite direction would:

• Absorb more energy than it releases

• Also release more energy

• Destroy energy

• Create energy

Tags

NGSS.HS-PS1-4

The molecule that an enzyme binds to is known as its

• Substrate

• Monomer

• Polymer

• Complimentary base pair

Reactants bind to enzymes at the _______.

• Substrate

• Product

• Activation energy

• Active site

Chemical reactions that absorb more energy than they release are called _________.

• Exothermic

• Catalyzed

• Endothermic

• Anabolic

Tags

NGSS.HS-PS1-4

A common enzyme found in the stomach is most active at pH values between 0.5 and 2.5. Between 2.5 and 3.4 it works more slowly at 3.5 and above is becomes completely inactive. Why does this happen?

• The enzyme inactivates because it melts into a liquid at the wrong pH.

• The enzyme denatures (changes shape), changing its active site needed for binding to specific substrates.

• The enzyme slows down because changing the pH also changes the temperature, which affects the reaction

• The enzyme is able to bind more substrate with a higher pH.

According to the graphs, which graph shows a reaction during which more energy is released than absorbed?

• Graph A

• Graph B

• Both graphs

• Neither graph

Tags

NGSS.HS-PS1-4

There are at least 5 factors that affect the rate of chemical reactions. List 3 of the factors we talked about in class AND describe how each one specifically affects the rate of a chemical reaction. (6 points)

Tags

NGSS.HS-PS1-5