work sheet for biology

Worksheet 8

Read Chapters 18, 19 and 20 in the textbook.

1. http://highered.mcgraw-hill.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/0072437316/120080/bio26.swf::The Tryptophan Repressor

What is an operon? What is a repressor?

2. http://highered.mcgraw-hill.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/0072437316/120080/bio27.swf::Combination of Switches - the Lac Operon

What happens when glucose is present? What happens when glucose is absent and lactose is present?

3. What are oncogenes? What are proto-oncogenes?

4. http://www.youtube.com/watch?v=vi-zWoobt_Q

What are steps of gene regulation in eukaryotes?

5. http://www.sumanasinc.com/webcontent/animations/content/hiv.html

What does reverse transcriptase do?

6. http://www.pbs.org/wgbh/pages/frontline/aids/cron/

Click through the timeline. When was the HIV virus discovered?

What was the treatment breakthrough in 1995?

7. http://dnalc.org/resources/animations/pcr.html

What are the steps of PCR, Polymerase Chain Reaction?

8. http://www.pbs.org/wgbh/harvest/engineer/transgen.html

Make a transgenic crop. What are the steps?