2.5 Cell Cycle Flashcards Preview

HL Biology > 2.5 Cell Cycle > Flashcards

Flashcards in 2.5 Cell Cycle Deck (39)
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1

What phases are included in interphase?

G1, S, and G2

2

Describe the cell in G1.

Cell is smallest it will ever be at the beginning of this phase

3

What happens during G1?

growth

4

What happens during S Phase?

replication of DNA

5

What is the S Phase referred to as?

synthetic phase

6

What happens to cell in G2 phase?

cell grows and makes preparations for mitosis

7

What happens to organelles in G2 phase?

organelles may increase in number

8

What happens to DNA in G2 phase?

DNA begins to condense from chromatin to chromosomes

9

What happens to microtubules in G2 phase?

microtubules begin to form

10

What is step 1 of chromatin becoming chromosomes?

DNA wraps around histones to form nucleosomes

11

What is step 2 of chromatin becoming chromosomes?

Nucleosomes wrap around further to form solenoids

12

What is step 3 of chromatin becoming chromosomes?

Solenoids group together to form chromosomes

13

What is step 1 of prophase?

Chromatin fibers tightly coiled to form chromosomes

14

What is step 2 of prophase?

Nuclear envelope disintegrates

15

What is step 3 of prophase?

Mitotic spindle begins to form, complete at end of prophase

16

What is step 4 of prophase?

Centromere of each chromosome has region called “kinetochore” that attaches to spindle

17

What is step 5 of prophase?

Centrosomes moves toward opposite poles of the cell due to lengthening microtubules

18

What is step 1 of metaphase?

Chromosomes move to middle, or equator. This area is called the metaphase plate.

19

What is step 2 of metaphase?

Chromosome’s centromere lies on the plate

20

What is step 3 of metaphase?

Movement of chromosomes is due to action of the spindle which is made of microtubules.

21

What is step 4 of metaphase?

Centrosomes now at opposite poles

22

What is step 1 of anaphase?

Usually shortest phase, begins when two sister chromatids are split

23

What is step 2 of anaphase?

Chromatids move to opposite poles of cell due to shortening of microtubules

24

What is step 3 of anaphase?

Centromeres are attached to microtubules, so they are pulled first

25

What is step 4 of anaphase?

At the end, each pole has identical set of chromosomes

26

What is step 1 of telophase?

Chromosomes are at each pole

27

What is step 2 of telophase?

Nuclear membrane begins to reform around each set of chromosomes

28

What is step 3 of telophase?

Chromosomes start to elongate to form chromatin

29

What is step 4 of telophase?

Nucleoli reappear

30

What is step 5 of telophase?

Spindle apparatus disappears

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