2.5 Cell Cycle Flashcards Preview

HL Biology > 2.5 Cell Cycle > Flashcards

Flashcards in 2.5 Cell Cycle Deck (39):
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

31

What is step 6 of telophase?

Cell is elongated and ready for cytokinesis (division)

32

What is number 1?

centromere

33

What is number 2?

chromatid

34

What is number 3?

kinetochore

35

What is number 4?

microtubules

36

What phase is this?

prophase

37

What phase is this?

metaphase

38

What phase is this?

anaphase

39

What phase is this and what is number 1?

telophase and cytokinesis, cleavage furrow

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