Chapter 12

Question 1

4 reasons cells divide

Answer 1

Reproduction
Growth and development
Tissue renewal
Maintain SA:V ratio

Question 2

DNA of a cell

Answer 2

Genome

Question 3

Subunits of DNA

Answer 3

Nucleotides

Question 4

3 comp of DNA

Answer 4

Nitrogenous base
Sugar
Phosphate group

Question 5

Chromosomes are composed of:

Answer 5

Chromatin

Question 6

Condensed region of chromosome

Answer 6

Centromere

Question 7

Region of repetitive DNA sequence at end of chromosome

Answer 7

Tetromere

Question 8

Disc-shaped protein that spindle fibers attach to

Answer 8

Kinetochore

Question 9

Growth, protein synthesis, organelle synthesis

Answer 9

G1

Question 10

DNA duplicated

Answer 10

S

Question 11

Growth, synthesis of microtubules, cell cycle check pts

Answer 11

G2

Question 12

Cells spend __ % of time in interphase

Answer 12

90

Question 13

Nuclear division

Answer 13

Mitosis

Question 14

Chromosomes begin to condense

Mitosis spindle begins to from

Answer 14

Prophase

Question 15

Nuclear envelope disassembles

Spindle fibers attach to kinetochores

Answer 15

Prometaphase

Question 16

Chromosomes align along metaphase plate

Answer 16

Metaphase

Question 17

Sister chromatids cut apart

Answer 17

Anaphase

Question 18

Reversal of prophase

Nuclear envelope reforms

Answer 18

Telophase

Question 19

Division of cytoplasm

NOT part of mitosis

Answer 19

Cytokinesis

Question 20

“Restriction point”

Answer 20

G1 check pt

Question 21

If at G1 cell receives green light, continues to ____, red light, continues to _____

Answer 21

S

G0

Question 22

2 main regulatory molecules

Answer 22

Cyclins

Cyclin-dependent kinases (Cdk)

Question 23

G2 check pt

Answer 23

Maturation-promoting factor

Question 24

M phase check pt

Answer 24

Anaphase promoting complex (APC)