3.7) Mitosis

Question 1

What stage occurs before mitosis in the cell cycle?

Answer 1

Interphase

Question 2

What are the five stages of mitosis?

Answer 2

1. Intephase
2. Prophase
3. Metaphase
4. Anaphase
5. Telephase/ Cytokineses

Question 3

What is Mitosis important for?

Answer 3

1. Growth
2. Repair
3. Reproduction

Question 4

What happens in the interphase stage?

Answer 4

DNA replicates
The two copies of DNA join at the center called the centromere

Question 5

What happens in the prophase stage?

Answer 5

Chromosomes condense and becomes visible
Spindle fibers form

Question 6

What happens in the metaphase stage?

Answer 6

Chromosomes are aligned at the center of the cell by the spindle fibers

Question 7

What happens in the anaphase stage?

Answer 7

Centromeres divide separating each pair of chromatids
Spindle fibers pull the chromoatids to opposite poles of the cell

Question 8

What happens in the telephase stage?

Answer 8

• Chromosomes reach poles and become longer and thinner, then eventually disappear leaving chromatin
• Nuclear envelope reforms around each set of chromosomes- creating two nuclei
• Cytokineses occurs, dividing the cytoplasm forming two identical daughter cells

Question 9

In which stage do chromosomes become visible, shorten and thicken

Answer 9

Prophase

Question 10

In which stage are the chromatids pulled part to opposite ends of the pole?

Answer 10

Anaphase

Question 11

In which stage do the chromosomes line up in the middle of the cell?

Answer 11

Metaphase

Question 12

What pulls the chromatids apart?

Answer 12

The spindle fibers

Question 13

In which stage does the nuclear envelope and nucleolus reform?

Answer 13

Telephase

Question 14

What is cytokineses?

Answer 14

The process by which the cytoplasm divides forming two identical daughter cells

Question 15

Cell division in prokaryotic cells take place by which process?

Answer 15

Binary fission

Question 16

How does the process of binary fission work?

Answer 16

1. Circular DNA molecule replicates, both copies attach to cell membrane
2. Cell grows, membrane pinches forward, dividing the cytoplasm
3. Two new cells are formed, each with a single copy of the circular DNA and plasmids

Question 17

How does the replication of viruses work?

Answer 17

1. Viruses replicate by injecting their nucleic acid into a host cell
2. The genetic info provides the instructions for the host cell’s metabolic processes to produce: viral components, nucleic acids, enzymes and structural proteins
3. They are then assembled into new viruses