DNA Replication

enzyme

A(n) ________ (helicase) breaks the hydrogen bonds holding the two gases together.

This is called semi conservative replication

one of the old strands is present in each new molecule of DNA

What unzips or separates the two strands of DNA?

helicase

What kind of bonds are broken between the bases during the unzipping?

hydrogen bonds

What happens after the strands are separated?

A new, complimentary strand is made.

What is the product of DNA replication?

Two new identical molecules that have the original strand and the new complimentary one.

Why do our cells go through DNA replication?

So that the cells can go through mitosis.

What do we call the model of DNA replication?

semi-conservative replication

Do your cells grow larger or do cells split to create more cells? Why?

Cells split so that they will be more efficient at getting nutrients in and waste out.

Is it more efficient for a cell to have a large or small surface area to volume ratio? Why?

Large, when there’s more on the outside there is more places for things to get in and out.

What is the process of cell division called?

Mitosis.

List 2-3 reasons why cells divide:

1. Growth
2. Repair
3. Immune system

What are the different stages of the cell cycle (in order)?

a. Interphase

b. Prophase

c. Metaphase

d. Anaphase

e. Telophase

f. Cytokinesis

What is the end result of mitosis?

Two identical daughter cells.

What process must happen before mitosis occurs?

DNA replication

What are two types of cells in your body that would divide by mitosis?

Skin cells, muscle cells, lung cells

What are two types of cells that may not divide once they are mature?

Egg and sperm cells

How many chromosomes are in each of our cells?

46, 23 from each parent.

How many chromosomes are in the cell during DNA replication

92