Edexcel A2 Biology Unit 5 (6BIO5) - 22/06/2011- OFFICIAL THREAD !

NO BIOLOGY IN THAT PAPER WHATSOEVER. Answered 2 questions talking about transcription factors.

Reply 4423

Original post by Gman1234

NO BIOLOGY IN THAT PAPER WHATSOEVER. Answered 2 questions talking about transcription factors.

which 2 questions were they?

Reply 4424

someone upload the paper please! :biggrin:

Reply 4425

How does drug R reduce melanoma in a few months?
Drug R inhibits transcription factors from binding onto promotor region of DNA by acting as a repressor molecule. Gene coding for the differentiation of cells into cancerous melanoma are switched off and protein synthesis is inhibited.

Reply 4426

croag

12

Transcription factors? I didn't answer anything about those :I

What did y'all put for the multiple choice about phytochromes?

Reply 4427

Original post by croag

Transcription factors? I didn't answer anything about those :I

What did y'all put for the multiple choice about phytochromes?

Cross
Cross
Tick
Tick

Reply 4428

croag

12

Original post by Gman1234

Cross
Cross
Tick
Tick

That's what other's put, however I thought phytochromes weren't affected by the darkness and just whether there is Pfr or Pr. Is darkness only a lack of Pr? :/

Reply 4429

Omar1994

That's what other's put, however I thought phytochromes weren't affected by the darkness and just whether there is Pfr or Pr. Is darkness only a lack of Pr? :/

same :L

Reply 4430

Pfr is converted into Pr at night. So in darkness, Pr increases gradually providing its uninterrupted darkness.

Reply 4431

Original post by Gman1234

How does drug R reduce melanoma in a few months?
Drug R inhibits transcription factors from binding onto promotor region of DNA by acting as a repressor molecule. Gene coding for the differentiation of cells into cancerous melanoma are switched off and protein synthesis is inhibited.

daaam, you're right, I wrote loads about natural killer cells being activated, any marks do you think?

Reply 4432

Crushy

Original post by croag

That's what other's put, however I thought phytochromes weren't affected by the darkness and just whether there is Pfr or Pr. Is darkness only a lack of Pr? :/

Darkness converts Pfr to Pr SLOWLY.

That paper severely lacked biology. I don't know why I bothered to revise when I just had to talk about graphs and directly quote the scientific article word for word most of the time. These papers make me pretty nervous, no idea how I did.

Reply 4433

I think your getting confused with phytochromes. Pr and Pfr are both phytochromes.

Reply 4434

Not really sure :/
It did state that melanoma is cancerous which means mutation in the genome.

Reply 4435

Original post by Gman1234

Not really sure :/
It did state that melanoma is cancerous which means mutation in the genome.

hmmm, textbook says something about natural killer cells killing cancer cells causing apoptosis :/

Reply 4436