Lecture 8 - • Good cells get crowded out ← ←...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
26/10/2007 10:25:00 Eukaryotic cells Repair Maintenance Growth Reproduction (Meiosis only) Prokaryotic cells Some cells use mitosis for reproduction Reproduction / binary fission / mitosis Mitosis rates Skin cells: once a day Liver cells: once a year Nerve cells: none after maturation E. Coli: once every 20 minutes Life spans Stomach lining cells: 2 days Intestinal lining cells: 3 days Skin cells: 20 days Liver cells: 200 days Brain cells: 30-50 years Mitosis = Division of DNA Nuclear envelope disappears (prophase)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chromosomes condense (metaphase) Spindle fibers form (anaphase) Chromosomes pull apart (telophase) Division of cytoplasm (cytokenisis) Normal control of cell division Trigger chemicals Cellular clocks Hormones Local growth factors Cell size “Death gene” Loss of control = cancer Rapid division Cells do not stop dividing
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: • Good cells get crowded out ← ← Treatment • Removal • Slow the division (chemotherapy) • Cut off blood supply • Gene therapy ← ← ← ← Mutations 26/10/2007 10:25:00 ← Sources of mutations • Errors in replication and transcription • Exposure to mutagens (tobacco smoke, radiation) ← ← Mutations can be good, bad, or neutral • Mutations are the ultimate source of all genetic differences among individuals. • Without mutations, all individuals would share the same DNA. • Most mutations are neutral or harmful, however some are beneficial. • Deformed cells are quickly destroyed by the body. ← ← Aging • Researchers have discovered that aging in our cells triggers aging in our bodies • Cells may be programmed on divide only a certain number of times 26/10/2007 10:25:00 ←...
View Full Document

This note was uploaded on 04/07/2008 for the course BIO 1010 taught by Professor Hursr during the Fall '07 term at Missouri (Mizzou).

Page1 / 4

Lecture 8 - • Good cells get crowded out ← ←...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online