Lesson 5-Cell Division

Question 1

How does the cell know when to divide?

Answer 1

The DNA has the instructions

Question 2

Cell Cycle

Answer 2

The sequence of development and division of a cell

Question 3

Interphase

Answer 3

Preparation:
~cell doubles in size
~DNA replicates
~organelles double in number

Question 4

DNA strands=

Answer 4

chromatin

Question 5

2 chromatid=

Answer 5

1 chromosome

Question 6

How long does a cell cycle take for an adult?

Answer 6

24 hrs
(18-20 hrs. in interphase and 2 hrs. in mitosis)
(But an embryonic cell takes 30 min)

Question 7

Mitosis

Answer 7

Cell division

Question 8

Prophase

P for poles

Answer 8

~DNA forms chromosomes
~spindle fibers form
~centrioles move toward opposite poles
~nuclear membrane disappears

Question 9

Metaphase

M for middle

Answer 9

~chromosomes line up in the center of the cell

~spindle fibers attach to centromeres

Question 10

Anaphase

A for away/apart

Answer 10

~centromeres divide

~chromatids separate and move to opposite poles

Question 11

Telophase

T is for two

Answer 11

~nuclear membrane around each group of chromosomes
~chromosomes unwind
~cytokinesis begins

Question 12

Cytokinesis

Answer 12

~cytoplasm divides

~one cell becomes two (identical) cells

Question 13

Why do cells divide?

Answer 13

~reproduction
~growth
~repair

Question 14

Centrioles

Answer 14

Anchor the spindle fibers

Question 15

Mitosis and cytokinesis have how many daughter cells?

Answer 15

2