Cell division Homework #1 - Mrs.Brya

All species have:

1) A number of chromosomes that is unique to that species.

Prior to cell division, a cell has 14 chromosomes. How many chromosomes will each daughter cell have?

2) 14 cells, same as mother.

What is true at the completion of cell division?

2) Two identical daughter cells will have been formed

The DNA is copied during what phase?

3) The S phase

What is the most important in determining how quickly materials can move into and out of a cell?

3) The surface area of the cell.

Which of the following is true of interphase?

5) All of the above (Consist of G1, G2, and S phase. Large part of the cell cycle. Time of cell growth and development. Cell prepares of division during this time).

What is the cell cycle?

A series of events the cell goes through as they grow and divide.

Main reasons why cells divide rather than just continuing to grow larger and larger. State each reason: (A)

A) The Larger cell becomes the more demand the cell places onto it's DNA.

Main reasons why cells divide rather than just continuing to grow larger and larger. State each reason: (B)

B) The larger the cell becomes the more trouble the cell has moving, moving nutrience, and waste across the membrane.

Use the diagram to the right to summarize what happens durring the process of cell divison. Do not include the "details" of cell division. What is the "Big picture"?

Before division of the cell all DNA must be coppied and the 2 copies seperate with each daugher cell.

G2 Phase:

Cell assembles special structures needed for division

and they are held together in an area called _____.

Centromere

As a cell grows larger, the surface area of the cell increases much more rapidly than the cell.

False, if switched True.

G1, S, and G2 are collectively known as

Interphase

What is the role of DNA in a cell?

Job of replication, encoding information, mutation/recombination and gene expression.

Prior to cell division, each chromosome must be _______.

Replicate

S Phase:

Replication of DNA

Each of these copies is called a _______

Sister chromatid

Sister Chromatids / Centromeres

Sister: X until anaphase where they are separated, connected by centromeres. Centromeres: Two non-identical copies of chromosomes.

G1 Phase:

The cell size doubles. Enzymes, cytoplasm organelles, and molecules divide.

What problems might arise in a cell that did not complete it's G1 phase prior to cell division?

The two cells may be to small, also may notnhave all the organellse that are necassary.

As the cell grows larger, which increases more rapidly, the volume of the cell or the surface area of the cell?

The volume of the cell

Chromatids form when DNA replicates prior to cell division.

True

If a cell doesn't have enough DNA to make all of the proteins it needs, it cannon survive.

True

The number of mitochondria are increased during interphase.

True

What are the five stages of the cell cycle?

g1, s, g2, mitosis, cytokinesis