Biology hsc exam who ready!! (1 Viewer)

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Harley Chan

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F'd in the A realllllllly bad....didn't realy pay attention all year & gotta learn all topics... FML

+ can anyone please explain to me the 'one gene-one protein' theory by Beadle and Tatum.... i honestly don't get it!
 
Brontecat

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They were lead to their experiment by Thomas Morgan's eperiment with the Drosophila fruit fly (don't rlly remember how)

Then they used Neurospora crassa (bread mould) and 'attacked' half of their bread mould with X-rays and identified that under the influence of the rays the amino acid sequences underwent changes. So since this change affected the amino acid sequences the protein structures (produced after this time) also changed. They called this the one gene: one protein hypothesis.

Later, as more about cells and things were discovered scientists realised that proteins were made a step later than polypeptides. And that polypeptides were representative of any sequence of amino acids and therefore was a more accurate descritption of what had happened. It was then that the theory was revised in name to become the one gene: one polypeptide theory. As a better representation of all sequences rather than specialised sequences.

The experiment can account for the mutagenic nature of radiation as Beadle and Tatum observed permant, mutagenic changes within the mould. They noticed that the un-X-ray-exposed mould was still able to produce correct proteins whereas the X-ray affected mould would only do so under the influence of a solution designed to encourage protein synthesis.
 
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hollaholla

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Harley Chan said:
F'd in the A realllllllly bad....didn't realy pay attention all year & gotta learn all topics... FML

+ can anyone please explain to me the 'one gene-one protein' theory by Beadle and Tatum.... i honestly don't get it!
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Beedle and tatum experimented with bread mould. Now this bread mould normally has enzymes that enable certain vitamins to be produced. Theyy used xrays to cause mutations in one of the genees and found that some of th ebread moulds could no longer produce the enzyme for producing a particular vitamin. THey hypothesised that one gene must code for one enzyme. Since enzymes are made of protein---it became the one gene one protein hypothesis.

LAter it was found that some proteins consist of several polypeptides. Each different polyp was found to be determined by a different gene. so it became the ONE GENE ONE POLYPEPTIDE hypothesis.
 
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hollaholla

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Brontecat said:
They were lead to their experiment by Thomas Morgan's eperiment with the Drosophila fruit fly (don't rlly remember how)

Then they used Neurospora crassa (bread mould) and 'attacked' half of their bread mould with X-rays and identified that under the influence of the rays the amino acid sequences underwent changes. So since this change affected the amino acid sequences the protein structures (produced after this time) also changed. They called this the one gene: one protein hypothesis.

Later, as more about cells and things were discovered scientists realised that proteins were made a step later than polypeptides. And that polypeptides were representative of any sequence of amino acids and therefore was a more accurate descritption of what had happened. It was then that the theory was revised in name to become the one gene: one polypeptide theory. As a better representation of all sequences rather than specialised sequences.

The experiment can account for the mutagenic nature of radiation as Beadle and Tatum observed permant, mutagenic changes within the mould. They noticed that the un-X-ray-exposed mould was still able to produce correct proteins whereas the X-ray affected mould would only do so under the influence of a solution designed to encourage protein synthesis.
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lol soz didnt know you had already posted.
 
possessionless

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hollaholla said:
i dont get it....why are ppl *****? did you not study for the trials/in the holz?
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yes i did.
bio is my weakest subject though. i put the most effort in it and its still my weakest. i guess science just isnt my thing.
ranked like 5th or 6th :( which is good i guess but not in comparison to my other subjects.
 
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Hope they don't fuck us over like they did Religion English and Maths.

Bio is relatively straightforward, just read notes and you'll be fine. If worst comes to worst, employ waffle techniques for big markers. :ninja:
 
jet

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Lol, I'm yet to start studying. Still have to finish English Extension notes for Friday. Then I will start studying.
 
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Harley Chan

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Brontecat said:
They were lead to their experiment by Thomas Morgan's eperiment with the Drosophila fruit fly (don't rlly remember how)

Then they used Neurospora crassa (bread mould) and 'attacked' half of their bread mould with X-rays and identified that under the influence of the rays the amino acid sequences underwent changes. So since this change affected the amino acid sequences the protein structures (produced after this time) also changed. They called this the one gene: one protein hypothesis.

Later, as more about cells and things were discovered scientists realised that proteins were made a step later than polypeptides. And that polypeptides were representative of any sequence of amino acids and therefore was a more accurate descritption of what had happened. It was then that the theory was revised in name to become the one gene: one polypeptide theory. As a better representation of all sequences rather than specialised sequences.

The experiment can account for the mutagenic nature of radiation as Beadle and Tatum observed permant, mutagenic changes within the mould. They noticed that the un-X-ray-exposed mould was still able to produce correct proteins whereas the X-ray affected mould would only do so under the influence of a solution designed to encourage protein synthesis.
Click to expand...

Tthanks heaps. I get it now ! :D

Legend ;)
 
truestar92

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i feel like im ready! i just hope there aren't any suprises in this years exam
 
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