Mitosis

Question 1

What is mitosis

Answer 1

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

Question 2

Benefit of mitosis?

Answer 2

growth and repair of tissues

Question 3

What are the stages of interphase

Answer 3

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

Question 4

What are the 4 stages of mitosis

Answer 4

Prophase
Metaphase
Anaphase
Telophase

Question 5

What happens during in prophase

Answer 5

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

Nucleolus breaks down and nuclear membrane breaks down.

Spindle fibres develop

Question 6

What happens during metaphase

Answer 6

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

Question 7

What happens during anaphase

Answer 7

Centromere splits

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

Question 8

What happens during telophase

Answer 8

Chromosomes uncoil

New nuclear membrane forms around the chromosome

Question 9

After telophase is cytokinesis. What happens during it?

Answer 9

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

Question 10

Importance of mitosis?

Answer 10

Growth

Replace cells

Genetically identical cells

Asexual reproduction

Question 11

How do prokaryotic cells replicate

Answer 11

Binary fission

Question 12

Describe binary fission

Answer 12

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

Question 13

How do viruses replicate

Answer 13

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.