2.2 All cells arise from other cells

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Summarise Interphase

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1

Summarise Interphase

DNA replicates, leading to 2 chromatids joined at a centromere.
number of organelles and volume of cytoplasm increases

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2

Summarise Mitosis

nucleus divides to produce two nuclei with identical copies of DNA produced by parent cell

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3

Summarise Cytokinesis

cytoplasm and cell membrane divide to form 2 new genetically identical daughter cells

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4

Why do cells undergo mitosis?

Growth, Replacing cells and asexual reproduction

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5

How do prokaryotic cells replicate?

Binary fission

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6

Describe stages of binary fission

Replication of circular DNA and plasmids. Division of cytoplasm to produce two daughter cells. There is a single copy of circular DNA however variable number of copies of plasmids.

<p>Replication of circular DNA and plasmids. Division of cytoplasm to produce two daughter cells. There is a single copy of circular DNA however variable number of copies of plasmids. </p>
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7

How do viruses replicate?

They do not undergo cell division as they are non-living.
Attachment proteins attach to complementary receptors on host cell. Viral nucleic acid is injected into host cell.
Infected Host cell replicates virus particles.

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