Part 1 ch.7

Question 1

Biological catalysts function

Answer 1

Increase the rate of chemical reactions

Question 2

What happens to catalysts in the reactions?

Answer 2

• Do not become part of the products
• Are not consumed in the process
• Do not create a reaction

Question 3

How do enzymes work: What do they serve as

Answer 3

A physical site upon which substrates can be positioned for various reactions

Question 4

Explain the size of enzymes compared to substrates. What does it present as?

Answer 4

• Larger in size than the substrate
• Presents a unique active or catalytic site that only fits a particular substrate
  -Binds substrate
  -Participates directly in changes to the substrate
  -Not used up by the reaction
  -Can function over and over again

Question 5

A temporary enzyme-substrate union must occur at the active site:

Answer 5

Fit is so specific that it is described as a “lock-and-key” fit

Question 6

Bond formed between the substrate and enzyme are they weak or strong? Reversible or irreversible

Answer 6

weak and easily reversible.

Question 7

Once the enzyme-substrate complex has formed, an appropriate reaction occurs on the substrate, often with the aid of a______. Then

Answer 7

cofactor. Product is formed
Enzyme is free to interact with another substrate.

Question 8

Simple enzymes consist of

Answer 8

protein alone

Question 9

Conjugated enzymes contain ______ and ____, sometimes reffered to as

Answer 9

contain protein and non-protein molecules
- haloenzyme

Question 10

protein portion of a conjugated enzyme

Answer 10

apoenzyme

Question 11

either organic molecules called coenzymes or inorganic elements (metal ions)

Answer 11

cofactors