Download Cells and Enzymes Overview




1/30 Reminders
Help Desk Assignment due Monday 2/3- by the end of Help Desk shift (5
pm).
Exam 1 Tuesday 2/4
o bring your scantron
o bring a photo ID
o hand in exam and scantron
o sign out
o Can pick up exam at Help Desk starting Thursday 2/6 (avail until
Exam 2)
Activity 2 on Thursday 2/6 (prep!)
Another important type of protein
Enzymes
Who has them?
What do they do?
Enzymes
Biological catalysts
What do they do?
Are they consumed?
E.g. steak
Steak proteins 
When it hits your stomach/small intestine
What type of reaction is this?
Also characterized as?
Which means…?
Exergonic
Amino acids  absorbed
Circulation  cells
Used how?
What type of reaction is this?
Also characterized as?
Which means?
Endergonic
How rapidly do they occur?
These reactions
What can speed them up?
Enzymes speed up chemical rxns (figure on page 125)
Q: How?
A: By doing what?
Q: Huh?
Active site
What happens in the active site?
How?
Within the Active Site
1.
2.
pH
Acidity
What affects rxn rates?
Based on
Low pH 
At Optimum pH
activity?
Other pH’s:
pH and enzyme activity (6.16)
Temp & Rxn Rates
Effect of tem on reaction rates?
Why?
Until
Temperature and enzyme activity (6.16)
Competitive
Noncompetitive
Inhibitors & Enzymes (6.17)