11.1: The Cell Cycle

Question 1

Prokarykotic cells divide by…

Answer 1

Binary Fission

Question 2

6 Steps of Binary Fission

Answer 2

1. DNA molecule (circular) is attached by proteins to the inner membrane.
2. DNA replication begins at the origin and proceeds bidirectionally around circle.
3. New DNA is attached to inner membrane near the origin
4. As cell elongates, the DNA attachment sites separate.
5. A constriction forms at the midpoint
6. The synthesis of new cell membrane and cell wall separates the two daughter cells.

Question 3

Eukaryotic cells divide by…

Answer 3

Mitotic cell division.

Question 4

Division of the nucleus is called…

Answer 4

Mitosis

Question 5

Binary Fission basic summary

Answer 5

Replication of DNA, segregation of rep DNA to daughter cells, divsion

Question 6

Division of the cell wall…

Answer 6

Cytokinesis

Question 7

Chromosomes contain:

Answer 7

A single DNA molecule and proteins

Question 8

Phases of the cell cycle (2)

Answer 8

M phase and interphase

Question 9

M phase

Answer 9

1. mitosis
2. cytokinesis

Question 10

What is interphase?

Answer 10

Time between two successive M phases.

Question 11

Interphase phases

Answer 11

S phase, G1, G2

Question 12

What happens during interphase?

Answer 12

Preparations for division: DNA replication, cell growth

Question 13

What happens during S phase?

Answer 13

DNA replication

Question 14

What happens during G1 phase?

Answer 14

Preparation for S-phase DNA synthesis; regulatory proteins made

Question 15

What happens during G2 phase?

Answer 15

Size and protein content of cell increase: prep for M-phase mitosis and cytokinesis.

Question 16

Order of the phases in mitotic cell division:

Answer 16

M < G1 < S < G2

Question 17

G0

Answer 17

Phase in between M and G1, cells that are not actively dividing