1. Describe at least two experiments and discuss how they helped determine that DNA and not protein was the hereditary material. 2. What is the importance of the fact that the sugar-phosphate backbone of DNA is held together by covalent bonds, and that the two strands are held together by hydrogen bonds.

3. Explain how the 3’ and the 5’ end of the DNA molecule affects DNA replication.

4. Telomerase activity can both shorten and lengthen cancerous cell lifespan. Describe how both are possible.

PLEASE HELP ME, ITS OKAY IF YOU ONLY ANSWER ONE :)

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.

When the cell concentrates potassium within, against the natural tendency of matter, it is performing a. passive diffusion b. facilitated diffusion c. active transport d. pinocytosis