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Biology-3-Cell Structure > Mitosis > Flashcards

Flashcards in Mitosis Deck (13):
1

What is mitosis

Is division of a cell that results in each of the daughter cells having an exact copy of the dna of the parent cell

2

Benefit of mitosis?

growth and repair of tissues

3

What are the stages of interphase

G1:protein synthesis - cell increases in mass, new organelles and proteins formed

S: dna replication and amount of chromatin doubled

G2: organelle synthesis- spindle proteins synthesised

4

What are the 4 stages of mitosis

Prophase
Metaphase
Anaphase
Telophase

5

What happens during in prophase

Chromosomes condense and become visible. Sister chromatids are held together by centromere

Nucleolus breaks down and nuclear membrane breaks down.

Spindle fibres develop

6

What happens during metaphase

Chromosomes line up at the equator and attach to the spindle fibres at the centromere

7

What happens during anaphase


Centromere splits

Spindle fibres contract and pull Chromatids to opposite ends of the cell

8

What happens during telophase

Chromosomes uncoil

New nuclear membrane forms around the chromosome

9

After telophase is cytokinesis. What happens during it?

Cellular division occurs and 2 genetically identical daughter cells are produced, containing a full set of chromosomes (diploid cells)

10

Importance of mitosis?

Growth

Replace cells

Genetically identical cells

Asexual reproduction

11

How do prokaryotic cells replicate

Binary fission

12

Describe binary fission

Circular dna molecule replicates and both copies attach to the cell membrane

The plasmids also replicate

The cell gets bigger and he dna loops move to opposite ends of the cell

Cytoplasm begins to divide and New call walls begins to form

Cytoplasm divides and 2 daughter cells are produced.

Each daughter cell has one copy of the circular dna, but can have a variable number of copies of plasmids

13

How do viruses replicate

By attaching to their body cell with the attachment proteins on their surface.

They then inject their nucleic acid into the host cell

The genetic info on the nucleic axis then provides instructions for the host cells metabolic processes to start producing the vital components.