CH 12 Flashcards Preview

biology > CH 12 > Flashcards

Flashcards in CH 12 Deck (21):
0

Cell division functions in growth, replacement , repair and Asexual reproduction

just a statement

1

Prokaryotes divide by binary vision

just a statement

2

The Genome of Eukaryotes is organized into multiple chromosomes.

Just a statemenmt

3

The cell cycle: Mitosis alternates with interphase

Just a statement

4

Cytokinesis divides the cytoplasm

just a statement

5

Mitosis (Eukaryotes) may have evolved from binary vision

just a statement

6

A molecular control system drives the cell cycle

Just a statement

7

External and internal cues help regulate cell division

just a statement

8

Cancer cells escape controls on cell division

just a statement

9

define Genome

A cells endowment of DNA. its genetic info

10

Define Chromatin

Together , the entire complex of DNA and proteins tht is the building material of chromosomes

11

Define somatic cells

All body cells except the reproductive cells

12

Define Gametes

Reproductive cells, eggs and sperm

13

Define sister chromatids

Joined copies of the original chromosomes .

14

Define centromere

a region of the chromosomal DNA where the chromatid is attached ,ost closest to its sister chromatid

15

Define Mitosis

The division of the genetic material in the nucleus .

16

Define Cytokinesis

The division of the cytoplasm

17

Define spindle

Consists of fibers made of microtubules and associated proteins

18

What are the five stages of Mitosis

Interphase - G1, S , G2
Prophase
Prometaphase
metaphase
anaphase
telophase/ cytokinesis

19

At what specific phase is the DNA condensed, diffused, and replicated?

G1 - chromosomes or DNA are diffused
S - Chromosomes or DNA are replicated
G2 - Chromosomes are condensed

20

The process of mitosis

Interphase
G1- No change in DNA
S - DNA Replicated
G2 - Centromeres replicated
Prophase - Chromosomes move apart and spindle forms
Prometaphase - Nuclear envelope breaks down. spindles still form, microtubules attach to chr. through kinetochore. Chr begin to line up.
Metaphase - All chr are lined up at the metaphase plate between the 2 spindle poles as the spindle still forming.
Anaphase - Chr break from the metaphase plate, split one to each end, spindle still forming
Telophase - Chr to chromatin, reform nuclear env., spindle breaking down
Cytokinesis - Break down rest of cell, actin filaments pinch cytoplasm, cleavage furrow pinches the cell of into 2 cells (like a belt )