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2/14 Gene Regulation notes

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Mr. Bowen

on 22 February 2018

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Transcript of 2/14 Gene Regulation notes

Biofresh 2/14
1) What does DNA do?
2) What's a gene?
3) What do proteins do?
4) Is valentine's day romantic, or a consumerist construct?

Announcements:
Office hours after school today!
Gene Regulation NOTES 2/14
Review:
The code in DNA determines the structure of proteins which carry out the essential functions of life.
Review:
A gene is a stretch of DNA that codes for a protein.
A gene is a stretch of DNA that codes for a protein.
Genes need to be turned off and on depending on what cell they’re in.
For example, you don’t need brain proteins growing in your stomach.
Genes need to be turned off and on depending on what cell they’re in.
For example, you don’t need brain proteins growing in your stomach.
Most genes are “off” by default.
They are wrapped up in histone proteins and unable to make RNA.
Most genes are “off” by default.
They are wrapped up in histone proteins and unable to make RNA.
A cell can control the amount a protein is made in many ways and at every step of protein expression, and we do not know them all yet.
A cell can control the amount a protein is made in many ways and at every step of protein expression, and we do not know them all yet.
When a cell decides it needs more of a protein it will attach a promoter protein to the beginning of the gene.
- If it decides it needs less it will put a inhibitory protein there.
When a cell decides it needs more of a protein it will attach a promoter protein to the beginning of the gene.
- If it decides it needs less it will put a inhibitory protein there.
If a cell has too many already-made proteins it will tag them for destruction.
If a cell has too many already-made proteins it will tag them for destruction.
Cells can also have special strands of Regulation RNA that bind to regular RNA and either cut them up or block their code.
Cells can also have special strands of Regulation RNA that bind to regular RNA and either cut them up or block their code.
Developmental genes make proteins that regulate other genes during development.
(called homeotic genes)
Many genes/proteins are only used while an organisms is developing, and they need to be turned off afterward.
Fruit Fly
These are extra eyes growing on it's wings, legs and antenna.
We made this fly by injecting a mouse regulation gene into it when it was an egg.
Brain cell (neuron)
stomach cells
realistic
cartoon
inhibitor protein with RNA code
rna fragment
Proteasome: Protein shredder
remember this?
Genetics Essay!
The rough draft will be due on Friday Feb. 23rd
Work on it for the rest of the period.
We'll be adding two paragraphs after the rough draft.
1) What does DNA do?
2) What's a gene?
3) What do proteins do?
4) What is Gene Regulation?
5) What's a ribosome?
6) Is valentine's day romantic, or a consumerist construct?

The code in DNA determines the structure of proteins which carry out the essential functions of life.
Full transcript