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Cell Biology - Class 01
The in-depth study of human cells
By: David Botton

Nucleus

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Nucleus

parts

nuclear envelope (membrane)

houses DNA

chromosomes

sections of DNA

each section - gene

transcription in to mRNA from DNA for Ribosome to translate to protein

functions

reproduction

DNA replication

cell divisions

mitosis

somatic cells (non gametes)

create new cells with 100% of material

3 groups

stabile

normally do not divide

but can divide to recover

labile

constantly dividing quickly

examples

bone marrow (120 days)

epithelial cells (stomach 2 days skin 14 days)

permanent

never divide after completing growth

meiosis

gametes produce

sperm

egg

1/2 of DNA material in sperm/egg


(c) 2005 All Rights Reserved - David Botton