Edexcel A2 Biology SNAB 6BI04 ~ 6BIO5 June 2016

Photosynthesis is on the spec, divided into light dependent and light independent

Photosynthesis is in the spec both light independent and dependent but the textbook literally says nothing about photosystems or cyclic and noncyclic phosphorylation

Photosynthesis is in the spec both light independent and dependent but the textbook literally says nothing about photosystems or cyclic and noncyclic phosphorylation

guys when i want to print the article it comes up with a huge watermark. what to do? taking screen shot and printing it but ir comes out blurry


Posted from TSR Mobile

download the file and open from your documents, then print using adobe reader or something - that normally works for me

yh i tried that not working 😭😢


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Solve the questions without reading the synoptic article, however if the question refers to the paragraph number, I read it then solve the question

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guys when i want to print the article it comes up with a huge watermark. what to do? taking screen shot and printing it but ir comes out blurry


Posted from TSR Mobile

Any help please!

In the article paragraph 38, where its talking about 'assassin cells' destroying cancerous cells. Is this referring to T killer cells or something else?

I don't think you have to know what they are but there could be a question asking you to suggest how they might work or what they do and then you could talk about T killer cells?

Posted from TSR Mobile

Yeah thats what I thought, although I found this question: Inwhich 3 ways are the “assassin cells” different to lymphocytes? - So it must be a phagocyte right, because T killer is a lymphocyte?

this tip helped me loads, i personally went back ti look for it just to thank u haha, i didnt really think it was possible to do the qs without reading full article, but after ur tip i gave it a go


Posted from TSR Mobile

Ooh actually I'm just reading it now and I don't think they are lymphocytes or phagocytes and there are some differences. Looking at paragraphs 38 and 39, assassin cells only destroy cancerous cells whereas T killer cells destroy body cells infected by pathogens. Assassin cells also identify cancerous cells by sensing 'levels of chemicals found in cancer cells' whereas lymphocytes detect infected cells and pathogens by identifying non self antigens. Assassin cells also destroy cancer cells by causing them to 'commit suicide' which I assume means by inducing apoptosis, whereas T killer cells destroy infected cells by releasing perforin which causes the cell to lyse. I don't think we're supposed to know what assassin cells are but we just have to compare them to what we do know. Assassin cells are also genetically engineered and from the article it looks like they're still being developed so there's no way we would know what they are

Posted from TSR Mobile

Ah okay now that make sense! Thank you!!

Also do you know what the actual difference is between genetic engineering and synthetic biology?
Is it that genetic engineering consists of genetically modifying an already existing cell by changing its DNA and synthetic biology is producing new biological parts in cells that don't already exist?