1. Find your science journal. Feedback: Maria C
3.6, AHL 7.6 Enzymes
Find your science journal.
Feedback: Maria C

2. Mitosis versus Meiosis
Purpose of mitosis = growth, tissue repair, asexual reproduction

3. Crossing over: Prophase I
Non-sister chromatid from each homologous pair intertwine, reciprocal exchange genetic info

4. Significance: produce 4 haploid cells, each with new combination of alleles! (i.e. increases genetic variation)
We didn’t do this with our activity – 4 stacks (2 different combinations)

5. Applications of enzymes
Fruit juice pectinase

6. Applications of enzymes
Paper production cellulase

7. Applications of enzymes
Protease

8. Applications of enzymes
Protease

9. What are enzymes?

10. HL Lock and key
The substrate and active site match each other structurally and chemically (charges)
Problem: some enzymes can catalyze multiple reactions

11. HL Induced fit model
When the substrate approaches the enzyme, there is a conformational change in the active site
Alters stability of bonds in the substrate

12. HL Activation Energy

13. 3.6.5 What is lactose intolerance?
Lactose (milk sugar)
Lactose intolerance is the inability to digest lactose, because of a lack of the required enzyme lactase in the digestive system.

14. Frequency of lactose intolerance
Milk
Intolerance

15. Frequency of lactose intolerance in babies
Milk
Intolerance
The prevalence of lactose intolerance is lowest in populations with a long history of dependence on unfermented milk products as an important food source.

16. 3.6.5 Lactose free milk
Lactase is obtained by artificially culturing a fungus, Kluveromyces lactisthe fungus grows naturally in milk where it uses lactase to hydrolyze lactose into glucose and galactose
Biotechnology companies culture the yeast, extract the lactase from the yeast, and purify it for sale to food manufacturing companies

17. 3.6, AHL 7.6 Enzymes Find your science journal.
Submit your lactase lab.
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Announcement: LL, Test