Download 5:1 Cell Cycle

yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Polycomb Group Proteins and Cancer wikipedia, lookup

NEDD9 wikipedia, lookup

Vectors in gene therapy wikipedia, lookup

Epigenetics in stem-cell differentiation wikipedia, lookup

Mir-92 microRNA precursor family wikipedia, lookup

5.1 The Cell Cycle
Cells have distinct phases of growth, reproduction,
and normal functions.
5.1 The Cell Cycle
5.1 The Cell Cycle
More prefixes• Stage-step or part of
mere-segment or part
• Phase-appearance
• Divide-to separate
• Duplicate-an identical copy
• Double-to increase twofold Condense-reduce volume
• Copy-reproduction from an original
• Kine-movement
• inter-between
• pro-before
• meta-middle
• Ana-back
• telo-end
Cells double their DNA in order to divide and create two nearly identical
duplicates or copies.”
5.1 The Cell Cycle
A. Interphase-cell growth
• Gap1 (G1)-rapid protein synthesis, lots of enzyme
activity, organelles replicate (copy)
• Synthesis (S)-chromosomes become visible, replicate
and are now called sister chromatids connected by the
• Gap 2 (G2)-more metabolic activity, centrioles duplicate
and form spindle fibers made of microtubules.
5.1 The Cell Cycle
• The main stages of the cell cycle are gap 1, synthesis, gap
2, and mitosis.
– 1.Gap 1 (G1):2. cell growth
and normal functions
– 3.DNA synthesis (S):
4.copies DNA
– 5.Gap 2 (G2): 6.additional
growth 8. cell/nuclear
– 7. Mitotic Phase: includes
division of the cell nucleus
(mitosis) and division of the cell
cytoplasm 13.cytokinesis 14.
Mitosis 15. Cell cycle
5.1 The Cell Cycle
Cells divide at different rates
• G1-varies the greatest
• G0 – this cell is unlikely to divide again
5.1 The Cell Cycle
Cells divide at different rates.
• The rate of cell division varies with the need for those
types of cells.
• Some cells are unlikely to divide (G0).
5.1 The Cell Cycle
• Cell size is limited
• If cell is too small the cell does not contain all the
organelles it needs.
• If a cell is too large-needed nutrients could not diffuse in
and waste could not diffuse out. (starve or poison itself)
5.1 The Cell Cycle
Cell size is limited.
• Volume increases faster than surface area.
5.1 The Cell Cycle
• Surface area must allow for adequate
exchange of materials.
– Cell growth is coordinated with
– Cells that must be large have
unique shapes.