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OCR Biology F215 Control, Genomes and Environment Fri 15 June 2012

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state other vector sin which dna can be incorporated :smile:
Original post by Fatima0065
state other vector sin which dna can be incorporated :smile:


virus / lipososomes
Original post by otrivine
virus / lipososomes


+ Bacteria (eg agrobacterium tumefaciens), Named example of virus eg bacteriophages, BACs and the good old plasmid :smile:
Original post by Fatima0065
state other vector sin which dna can be incorporated :smile:


Viruses/liposomes/plasmids of bacteria (lol I wrote DNA previously!)

Describe the process of small scale timber production :smile:
(edited 11 years ago)
Reply 3844
Original post by otrivine
what is hypostatic?


epistatic gene - the gene that influences

hypostatic gene - the gene that IS influenced
Original post by Dogs
epistatic gene - the gene that influences

hypostatic gene - the gene that IS influenced


got it thanks :wink:
recessive- phenotype is expressed and not present with dominant allele
epistasis is the interaction of gene loci and masks the expression of another gene loci
Original post by rf229
yeah, pretty much right. this is the mark scheme:

filter (to remove fungus) ;
fungus washed (to remove penicillin) ;
continuous countercurrent / chemical extraction ;
concentration ;
addition of potassium ions ;
precipitate crystals / (potassium) salts ;
solvents used to purify penicillin ;
AVP ; e.g. dried, some are chemically modified, 99.5% pure


and in response to your question I have no idea? because no lactose is present? idk


It is because the bacteria will take up the lactose and break it down into glucose (remeber E.coli in the Lac Operon?) This means that there is no lactose present anymore. :')
Reply 3847
Original post by otrivine
got it thanks :wink:
recessive- phenotype is expressed and not present with dominant allele
epistasis is the interaction of gene loci and masks the expression of another gene loci


correct again!
im out for the night, probably be back tomorrow... you should relax soon! good luck with revision and exams! seeya
Original post by teaandscones
reverse transcriptase :smile: although technically it doesn't convert it, it just makes a complementary DNA strand so you're left with mRNA AND DNA


Okay :smile: thank you!
are clalcium ion use dto desoolve plasme mebrane when takein g up bactreia?
sorry about spelling..busy doing somethening :smile:
Original post by Dogs
correct again!
im out for the night, probably be back tomorrow... you should relax soon! good luck with revision and exams! seeya


thanks :wink:good night
Original post by Fatima0065
are clalcium ion use dto desoolve plasme mebrane when takein g up bactreia?


can you write this again sorry fatima ???
Describe the advantages to microorganism of the capacityto take up plasmid DNA from the environment:
Original post by otrivine
can you write this again sorry fatima ???


are calcium ions used to dissolve the cell wall,,or any other specific reason when taking up plasmid in bacteria :smile:
Original post by Fatima0065
are calcium ions used to dissolve the cell wall,,or any other specific reason when taking up plasmid in bacteria :smile:


calcium salts are used yes to break the peptidoglycan cell wall
Original post by Fatima0065
Describe the advantages to microorganism of the capacityto take up plasmid DNA from the environment:


more resistance, mutation ,pass on to offspring advatageous alleles , can become resistant to anitibioitic conjugation , can cause more bacterias to divide?
Original post by otrivine
calcium salts are used yes to break the peptidoglycan cell wall


thanks!! :d
Original post by Fatima0065
thanks!! :d


im sure is correct cause to check my answer i double checked in wikipedia
explain what is meant by gene therapy

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