hr part 2

Question 1

Why do cells divide?

Answer 1

growth and development

Question 2

How do cells know when to divide?

Answer 2

Using chemical signals from special proteins called cyclins

Question 3

tell cells when to start
dividing and later when to stop dividing

Answer 3

Cyclins

Question 4

• when a cell cannot stop dividing

Answer 4

Cancer

Question 5

How much dead skin cells we lose everyday?

Answer 5

30,000 to 40,000

Question 6

A cycle of alternating stages of division and rest
from division of a cell

Answer 6

Cell Cycle

Question 7

Two stages of Cell cycle

Answer 7

Interphase and Cell Division

Question 8

non-dividing stage of the cell

Answer 8

Interphase

Question 9

Longest stage of the cell cycle

Answer 9

Interphase

Question 10

Dividing Stage

Answer 10

Cell Division

Question 11

Cell is metabolically active

Answer 11

Nutrition
Biosynthesis
Respiration

Question 12

for growth and normal metabolic roles

Answer 12

G₁ -

Question 13

or DNA replication

Answer 13

S -

Question 14

for growth and preparation for mitosis

Answer 14

G₂

Question 15

Quiescent stage
* Cells are not able to move to the S phase
* Cells are unable to replicate their DNA

Answer 15

GAP 0 Phase (Go Phase)

Question 16

Division of cytoplasm
* Production of daughter cells

Answer 16

CYTOKINESIS

Question 17

containing the
haploid number (n)
of chromosomes -
divide by meiosis

Answer 17

Sex Cells

Question 18

all body cells except the
sex cells, and
containing diploid
(2n) number of
chromosomes -
divide by mitosis

Answer 18

Somatic Cells

Question 19

Somatic cell division
* Production of two daughter cells with the
same quantity and quality of
chromosomes as the parent cell Involves karyokinesis followed by cytokinesis

Answer 19

Mitosis

Question 20

How often do cells divide?

Answer 20

1 cycle within 24hours

Question 21

Apical meristem of onion root (how many hours)

Answer 21

20 hours

Question 22

Epithelial cells of intestine

Answer 22

every 10 hrs

Question 23

threadlike structures in the nucleus that are
made up of molecules of proteins and DNA.

Answer 23

Chromosomes

Question 24

Cells that contain two sets of chromosomes
* Symbol: 2n

Answer 24

Diploid Cells

Question 25

Cells that contain only one set of chromosomes
* Symbol: n

Answer 25

Haploid Cells

Question 26

pair of structures in an animal cell involved in
cell division

Answer 26

Centrioles

Question 27

region in the chromosome where two sister
chromatids are joined

Answer 27

Centromere

Question 28

network of fine fibers that provide structural
support for eukaryotic cell

Answer 28

CYTOSKELETON

Question 29

• Sex cell division
  A process that produces four daughter cells with
  haploid number of chromosomes as the parent
  cell

Answer 29

Meiosis

Question 30

(formation and
maturation of gametes)

Answer 30

gametogenesis

Question 31

formation and
maturation of sperms

Answer 31

Spermatogenesis

Question 32

formation and maturation of
egg cells

Answer 32

oogenesis

Question 33

Also known as reduction revision

Answer 33

MEIOSIS I

Question 34

replicated chromosomes
- appear as long slender threads

Answer 34

Leptonema

Question 35

Synapsis Occurs

Answer 35

Zygonema

Question 36

pairing of homologous
chromosomes

Answer 36

Synapsis

Question 37

pair of homologous
chromosomes

Answer 37

Tetrad

Question 38

chromosomes continue to become shorter
and thicker

Answer 38

Pachynema

Question 39

a series of exchange of genetic
material between the specific regions of the
homologous chromosomes

Answer 39

Crossing Over

Question 40

Tetrads tend to repel each other

Answer 40

Diplonema

Question 41

The area of contact between two chromatids

Answer 41

Chiasima

Question 42

Coiling and contraction of the
chromosomes continue

Answer 42

Diakinesis

Question 43

• a period of growth

Answer 43

INTERKINESIS

Question 44

double stranded chromosome

Answer 44

Dyads