Cell Size Surface Area (length x width x 6) Volume (length x width x height) Ratio of Surface Area to Volume Surface Area: Volume Ratio As Cells grow in size their SA/Vol ratio decreases and they become less able to feed themselves and get to a point where they must divide Go to Section :
25
Embed
Cell Size Surface Area (length x width x 6) Volume (length x width x height) Ratio of Surface Area to Volume Surface Area: Volume Ratio As Cells grow in.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Cell Size
Surface Area (length x width x 6)
Volume (length x width x height)
Ratio of Surface Area to Volume
Surface Area: Volume RatioAs Cells grow in size their SA/Vol ratio decreases and they become less able to feed themselves and get to a point where they must divide
divided and new nuclei formed. CYTOKINESIS (cell divides)
Centrioles
Chromatin
Interphase
Nuclear envelope
Cytokinesis
Nuclear envelope reforming
Telophase
Anaphase
Individual chromosomes
Metaphase
Centriole
Spindle
CentrioleChromosomes
(paired chromatids)
Prophase
Centromere
Spindle forming
Section 10-2Interphase, Mitosis and Cytokinesis
Go to Section:
Centrioles
Chromatin
Interphase
Nuclear envelope
Cytokinesis
Nuclear envelope reforming
Telophase
Anaphase
Individual chromosomes
Metaphase
Centriole
Spindle
CentrioleChromosomes
(paired chromatids)
Prophase
Centromere
Spindle forming
Section 10-2Interphase, Mitosis and Cytokinesis
Go to Section:
Centrioles
Chromatin
Interphase
Nuclear envelope
Cytokinesis
Nuclear envelope reforming
Telophase
Anaphase
Individual chromosomes
Metaphase
Centriole
Spindle
CentrioleChromosomes
(paired chromatids)
Prophase
Centromere
Spindle forming
Section 10-2Interphase, Mitosis and Cytokinesis
Go to Section:
Centrioles
Chromatin
Interphase
Nuclear envelope
Cytokinesis
Nuclear envelope reforming
Telophase
Anaphase
Individual chromosomes
Metaphase
Centriole
Spindle
CentrioleChromosomes
(paired chromatids)
Prophase
Centromere
Spindle forming
Section 10-2Interphase, Mitosis and Cytokinesis
Go to Section:
Centrioles
Chromatin
Interphase
Nuclear envelope
Cytokinesis
Nuclear envelope reforming
Telophase
Anaphase
Individual chromosomes
Metaphase
Centriole
Spindle
CentrioleChromosomes
(paired chromatids)
Prophase
Centromere
Spindle forming
Section 10-2Interphase, Mitosis and Cytokinesis
Go to Section:
Centrioles
Chromatin
Interphase
Nuclear envelope
Cytokinesis
Nuclear envelope reforming
Telophase
Anaphase
Individual chromosomes
Metaphase
Centriole
Spindle
CentrioleChromosomes
(paired chromatids)
Prophase
Centromere
Spindle forming
Section 10-2Interphase, Mitosis and Cytokinesis
Go to Section:
HOW DOES MITOSIS KNOW WHEN TO STOP?
Suppose you had a paper cut on your finger. Although the cut may have bled and stung a little, after a few days, it will have disappeared, and your finger would be as good as new.
Section 10-3
1. How do you think the body repairs an injury, such as a cut on a finger?
2. How long do you think this repair process continues?3. What do you think causes the cells to stop the repair
process?
Go to Section:
Control of Cell DivisionSection 10-3
Go to Section:
Cells will continue to grow UNTIL they touch another cell - this is called CONTACT INHIBITION
A sample of cytoplasm is removed from a cell in mitosis.
A sample is injected into a second cell in G2 of interphase.
As a result, the second cell enters mitosis.
Effect of CyclinsSection 10-3
Go to Section:
Scientists discovered that a set of proteins they called “Cyclins” control the start of the cell cycle
Internal Regulators Internal Regulators - a series of proteins
that make sure mitosis is controlled. Some make sure the cell does not enter mitosis until all chromosomes have been copied
Others will not let the cell start anaphase until chromosomes are attached to the spindle
External Regulators Proteins that respond to events outside the
cell They speed up or slow down the rate of cell
division Growth factors tend to speed up rate of
mitosis Molecules found on the surface of
neighbouring cells tend to slow down rate so cells don’t interfere with each other