DQ 2/9/10

• Who was the first scientist to observe what are now called bacteria (p 29)?

• What is the most abundant chemical found in living cells (p19)?

• What are the three parts of the cell theory (p 30)?

DNA guided reading p 78-79

1. A cell makes a copy of ____ before mitosis occurs

2. DNA replication ensures that each ___________ __________ will have all of the genetic information it needs to carry out its activities

3. By the early _________ the work of several scientists showed that DNA carries all of the cell’s instructions

4. In 1953, _________ and __________ figured out the structure of DNA and how DNA copies itself

5. A DNA molecule looks like a _______ ________ or __________ __________

6. Because of the shape of a DNA molecule, it is often called a _________ ___________

7. The 2 sides of the DNA ladder are made up of a sugar called _______, alternating with molecules known as ________.

9. There are 4 kinds of nitrogen bases:• A =• T =• G =• C =

10.See figure 20. During DNA replication, a DNA molecule __________ between its paired bases.

11.DNA replication begins when the 2 sides of DNA molecule _______ and separate, like a zipper unzipping.

12.The order of the ______ _______ in each new DNA molecule will exactly match the order of the orginal DNA molecule.