Enzymes and Biochemical Reactions Objectives

Question 1

Summarize how energy changes during a biochemical reaction as bonds are broken and formed

Answer 1

-reactions absorb or release energy
-breaking a bond requires energy t be absorbed
-forming a bond allows energy to be released

Question 2

Explain the overall function of enzymes in biochemical reactions like photosynthesis and cellular respiration.

Answer 2

Enzymes control all metabolic reactions. They speed up reactions (that can occur on their own, just slowly) by lowering the activation energy needed to get the reaction started.

Question 3

What are five factors that affect the rate of chemical reactions

Answer 3

temperature, pH, substrate concentration, catalyst, competitive inhibitor

Question 4

How does temperature affect a chemical reaction?

Answer 4

it increase the rate of reaction

Question 5

How does pH affect a chemical reaction?

Answer 5

enzymes only work at specific pH, so if it changes, it can affect speed of reaction

Question 6

How does substrate concentration affect a chemical reaction?

Answer 6

the higher amount of substrate, the faster the reaction (due to more particle collision)

Question 7

How does catalyst affect a chemical reaction?

Answer 7

speed up reactions (lower activation energy needed for the reaction to start)

Question 8

How does a competitive inhibitor affect a chemical reaction?

Answer 8

slows down reaction (competes with substrate for the active site on the enzyme