CH. 3 The Cell Cycle

Question 1

What are the 2 major periods of the cell cycle?

Answer 1

Interphase and Mitotic phase

Question 2

This is a period of cell growth from cell formation to cell division and is divided into 3 sub phases.

Answer 2

Interphase

Question 3

What are the 3 sub phases of Interphase?

Answer 3

G1- gap 1
S- Synthesis
G2- Gap 2

Question 4

This phase of interphase where the cell synthesizes proteins and grows. It is the longest phase.

Answer 4

G1 gap 1

Question 5

In this phase of interphase DNA replicates. There are 46 chromosomes in a cell and during this phase we have 96.

Answer 5

S phase

Question 6

During this phase of Interphase proteins needed for cell division are synthesized. It is the shortest phase.

Answer 6

G2 Gap 2

Question 7

Once Interphase is complete the cell is not ready for the ____ phase.

Answer 7

Mitotic

Question 8

What are the 4 stages of mitosis?

Answer 8

1. Prophase
2. Metaphase
3. Anaphase
4. Telophase

Question 9

This stage of mitosis is divided into early and late phases.

Answer 9

Prophase

Question 10

What happens during Early Prophase?

Answer 10

Chromatin condenses as chromosomes and mitotic spindle forms from centrioles.

Question 11

What happens during Late Prophase?

Answer 11

The nuclear envelope dispersed, kinetochore microtubules pull chromosomes toward the middle.
Centrioles move away from eachother to the poles-opposite ends of the cell.

Question 12

What is the second phase of Mitosis?

Answer 12

Metaphase

Question 13

What occurs during Metaphase?

Answer 13

Chromosomes align in the middle of the cell (metaphase plate)

Question 14

What is the third phase in Mitosis?

Answer 14

Anaphase

Question 15

What occurs during Anaphase?

Answer 15

Chromosomes split and are pulled toward poles, cell elongates.

Question 16

What is the final phase of Mitosis?

Answer 16

Telophase

Question 17

• This phase starts when chromosomes stop.
• A new nuclea envelope forms around each chromatin mass, nucleoli reappear within the nuclei and the spindle breaks down and dissappears.
• Mitosis is over and the cell for a period of time is binucleate and each new nucleus is identical to the original mother nucleus.

Answer 17

Telophase

Question 18

This is the division of cytoplasm. It begins during late anaphase and continues through and beyond telophase. A contractile ring of actin microfilaments forms the cleavage furrow and pinches the cell in two.

Answer 18

Cytokinesis