Cell Biology
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Transcript of Cell Biology
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Cell BiologyMitosis, DNA, RNA
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Mitosis (Cell Reproduction) This is the process of cell division resulting
in the production of 2 daughter cells from a single parent cell.
The daughter cells are identical to one another and to the parent cell.
Happens during growth or repair.
Mitosis is divided into 4 main stages: P M A Trophase etaphase naphase elophase
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Prophase n Metaphase1) Prophase
Chromosomes are duplicated (become 2 sisters)
2) Metaphase (Middle phase) Chromosomes are aligned in the middle of the
cell
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Anaphase and Telophase3) Anaphase
The paired chromosomes separate and move to the opposite sides of the cell.
4) Telophase Cell membrane pinches inwards, forming two
daughter cells
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Mitosis Video clips
Mitosis TPRs
http://www.youtube.com/watch?feature=player_detailpage&v=3kpR5RSJ7SA
http://www.cellsalive.com/mitosis.htm
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Has a LARGE vacuole Has small vacuoles
Has a CELL WALL Does NOT have a cell wall
Has a rectangular shape Has a oval shape
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Which set of drawing shows what happens to cells in plant root tips during growth?
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DNA and RNA Is the hereditary material in all organisms
located in the cell nucleus. Information in DNA is stored in 4 bases:
A – Adenine T – Thymine C – Cytosine G – Guanine
A and T always form a base unit (AT & T)C and G form another base unit
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DNA video clip http://learn.genetics.utah.edu/content/begi
n/tour/
Remember A always pairs with T C and G go together
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Remember AT & T, C with G
G T T C
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Remember AT & T, C with G
G T T C
T C A A G
3’ AGTTC 5’
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Now for RNA RNA is similar to DNA except that ‘T’ is replaced
by ‘U’ or Uracil. To convert DNA to RNA Step 1: Replace C with G, G with C, A with T and T
with A. Step 2: Replace only ‘T’ with ‘U’
What is the RNA molecule coded from the DNA molecule ATGCGC?
Step 1T A C GCGU A C G C G Step 2
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Find the RNA moleculeFor the DNA molecule
http://www.youtube.com/watch?v=vJSmZ3DsntU
A G T T CStep 1
Step 2 A G U U C
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Review Mitosis
Prophase, Metaphase, Anaphase and Telophase
Difference between Animal and Plant cells
RNA transcription
Complete the worksheet on Mitosis and DNA