Cells 1.6 Cell division Flashcards Preview

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Flashcards in Cells 1.6 Cell division Deck (15)
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1

Why do eukaryotes need to do mitosis?

1. embryonic development

2. repair

3. growth

4. asexual reproduction

2

Draw and explain the process for mitosis.

Mitosis

Prophase The nuclear is broken down. The DNA condenses to be visible chromosomes through supercoiling. Spindle fibers grow from each of centrioles

Metaphase

The chromosomes line up at the equator. The spindle fibers attach themselves to each chromatid.

Anaphase

The spindle fibers shorten as the chromatids are now pulled apart into sister chromatids.

Telophase

Chromosomes uncoil. The 2 nuclear membranes form around each pole. Spindle fibers break down.

Interface

3

What happens in the interface?

Interphase is a very active part of the cell cycle. In this part, many processes occur in the nuclear and cytoplasm.

4

In what phase of the cell cycle is this cell in?

Interphase

5

In what phase of the cell cycle is this cell in?

Prophase

6

In what phase of the cell cycle is this cell in?

Metaphase

7

In what phase of the cell cycle is this cell in?

Anaphase

8

In what phase of the cell cycle is this cell in?

Telophase

9

In what phase of the cell cycle is this cell in?

Cytokinesis

10

How do you calculate a mitotic index?

Mitotic index = (total number of cells doing mitosis)/(total number of cells)

11

What is the mitotic index used for?

Mitotic index is often used for doctors to determine whether the patient has cancer, as well as the chance of the patient's survival, and whether or not the patient will respond positively or negatively to chemotherapy.

12

Compare cytokinesis between animal and plant cell.

Animal cells do not have cell walls. Plant cells have cell walls that is created through a cell plate. Vesicles do not line up in an Animal Cell.Vesicles line up along the equator in Plant cells. Animal cells are separated by cleavage furrow. Plant cells are not separated by cleavage furrow. List similarities eg. Both plant and animal cells' cytoplasm is separated. Both plant and animal cells form 2 genetically identical daughter nuclei.

13

What are cyclins?

Cyclins are proteins that control the progression of cells through the cell cycle by activating enzymes.

14

What causes cancer?

Mutagens: physical or chemical factor that causes DNA mutations

  • physical (UV, Xray, gamma radiation)
  • Chemical (polonium,  carbon monoxide, radium)

Oncogenes: genes that have the potential to cause cancer. Usually have rapid growth

Metastasis: when cancerous cells break off from a tumour, they travel in the body stream, and cause new tumours elsewhere. 

 

15

What kind of cell division does tumour present?

Tumour presents an example of an uncontrolled cell division.