OCR 2010 A2 Biology Unit 2 - Control, Genome and Environment Watch

TX22
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#2561
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#2561
for batch culture are the products harvested at the end or at the end of each batch?
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Archen
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#2562
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(Original post by george54)
tRNA isnt involved in transcription or replication... doesn't that answer your question? it explains the two 'no's in the areas by transcription and replication...
BRILLIANT!
i actually could kiss you

i am such a blonde:o:
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skatealexia
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#2563
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#2563
During stationary phase.
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george54
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#2564
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(Original post by Archen)
BRILLIANT!
i actually could kiss you

i am such a blonde:o:
are you a hot blonde?
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chuck111
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#2565
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(Original post by thekooks)
lol well I am planning on staying up til about 3.
yer me too
stay on tsr tonight
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-F-
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(Original post by thekooks)
arghh just finished revising module 2

module 4 to go!!!!!!!

anyone doing an all-nighter??
yes me! im still trying to learn the spec, forget reivsing. some of this stuff is new to me. and im meant to be getting a B :o:
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InvoluntarySlacker
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#2567
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(Original post by thekooks)
arghh just finished revising module 2

module 4 to go!!!!!!!

anyone doing an all-nighter??
Yup and yup.
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-F-
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(Original post by -F-)
can someone explain wheat in terms of artificial cloning? theres a digram in the purple OCR textbook that i just dont understand. but it says we need to understand in the spec..
anybody???
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mikey_g
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(Original post by TX22)
for batch culture are the products harvested at the end or at the end of each batch?
end of each batch!
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mikey_g
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(Original post by -F-)
anybody???
MODERN BREAD WHEAT

Wild Einkorn (AuAu) is domesticated via artficial selection, which alters the phenotype (for desirable characteristics).

Domesticated Einkorn of AuAu was bred with wild grass of BB

The result was AuB (emmer wheat). This is sterile as it has an uneven number (thus non homologous) chromosomes so meiosis cannot be completed (bivalents can't form in prophase I).

However a mutation doubled the chromosome number to give AuAuBB (Mutated Emmer wheat).

This was bred with goat grass of DD

The result was AuBD (again sterile)

Again another mutation doubled the chromosome number, producing, AuAuBBDD - modern bread wheat (Triticum Aestivum). Because nuclei need to be larger to contain the extra chromosomes (it's hexaploid) the cells are also bigger.

________________________________ _____________________
Artificial Selection programmes continue to produce improved varieties. Desirable characteristics include:

• Resistance to fungal infections
• High protein content
• Resistance to lodging (stem bending in wind / rain)
• Increased yield
• straw (stem) stiffness
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InvoluntarySlacker
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#2571
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#2571
Double post fail.
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Gemmer
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#2572
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Quick question:

How is pH maintained in a fermenter?
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Chunkeymonkey62
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The Chi squared test.

ONLY need to know how to work it out? No questions on why we use it for such?
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-F-
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#2574
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for epistasis do we need to know the examples given in the textbook?
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-F-
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(Original post by Gemmer)
Quick question:

How is pH maintained in a fermenter?
a buffer?
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Sakujo
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(Original post by Gemmer)
Quick question:

How is pH maintained in a fermenter?
Buffer solution?
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Sakujo
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#2577
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(Original post by -F-)
for epistasis do we need to know the examples given in the textbook?
I hope not, there's like ten examples for the gene section.
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-F-
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(Original post by Chunkeymonkey62)
The Chi squared test.

ONLY need to know how to work it out? No questions on why we use it for such?
is the following right?

X^2 below critical value at 5% = no significant differance, therefore you accept null hypothesis

X^2 above critical value at 5% = significant difference between observed and expected, therefore accept experiemental hypothesis.
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AnniG
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#2579
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Just been doing this past question - could someone please explain why in both transcription and DNA replication "both DNA polynucleotide chains act as templates"? I'd have thought that in transcription only one strand (the template strand) acted as a template?
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Sakujo
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(Original post by -F-)
is the following right?

X^2 below critical value at 5% = no significant differance, therefore you accept null hypothesis

X^2 above critical value at 5% = significant difference between observed and expected, therefore accept experiemental hypothesis.
What is the null hypothesis? That there is not difference between expected and observed values ie our model is correct?
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