Download
key concept cells have distinct phases of growth n.
Skip this Video
Loading SlideShow in 5 Seconds..
KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions. PowerPoint Presentation
Download Presentation
KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions.

KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions.

139 Vues Download Presentation
Télécharger la présentation

KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions.

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions.

  2. More prefixes- • Stage-step or part of mere-segment or part • Phase-appearance Soma-body • Divide-to separate Centro-center • 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.”

  3. 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 centromeres. • Gap 2 (G2)-more metabolic activity, centrioles duplicate and form spindle fibers made of microtubules.

  4. 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 division • 7. Mitotic Phase: includes division of the cell nucleus (mitosis) and division of the cell cytoplasm 13.cytokinesis 14. Mitosis 15. Cell cycle

  5. Cells divide at different rates • G1-varies the greatest • G0 – this cell is unlikely to divide again

  6. 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).

  7. 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)

  8. Cell size is limited. • Volume increases faster than surface area.

  9. Surface area must allow for adequate exchange of materials. • Cell growth is coordinated with division. • Cells that must be large have unique shapes.