Lab 5. Cells
Organelles
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Like mini organs within the cell, each with a
particular function but that function together
in systems
Major ones are: Endoplasmic reticulum,
mitochondria, nucleus, golgi, plasma
membrane, lysosomes, ribosomes,
peroxisomes
Cell Division
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From one parent cell, two identical
“daughter” cells are produced
Mitosis: first copies, then divides all the
DNA in a cell to place into the two daugther
cells
Cytokinesis: divides the cytoplasm in half to
create two complete cells.
Stages of cell cycles
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Interphase
Mitosis = PMAT:
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Prophase: nuclear envelope disappears, spindle
starts to from, chomosomes become visible
Metaphase: Chromosomes line up at middle
(metaphase plate)
Anaphase: chromosomes separate
Telophase: nuclear envelope reforms,
chromosomes decondense
Cytokinesis
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Occurs at roughly the same time as
telophase.
Cleavage furrow divides the cytoplasm
making two complete daughter cells.
Today
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1.
2.
3.
Lab exercise #5 Activities:
Look over membrane structure and cell
model
Label Figure 5.2, Fill in Table 5.2 (easier
after Thursday’s lecture)
Look at onion root tip slides OR whitefish
slides, locate and draw an example of
each phase on piece of paper provided
What to look for…
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Interphase: most cells (like 95%) will be in
interphase. Can’t distinguish the
chromosomes
P: early spindle forming, start to see
chromosomes
M: chromosomes all lined up at middle
A: chromos clustered around each pole
T: cleavage furrow (cytokinesis)
To Turn in:
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Drawings of the 6 stages
Table 5.2 and Figure 5.2
Sections D and F of the Lab Report