Edexcel GCE Biology Unit 4 6BI04 June 2013

For the question regarding enzymes "S" and "T" or something. And they asked what their roles/function was....

For that I was saying that these were the enzymes : Integrase and Reverse transcriptase. I was talking about their roles, how Reverse transcriptase reverses transcription, and changes Viral RNA into Viral DNA, and how integrase integrates the Viral DNA in the host's cell.

Is this what we were supposed to do, or have I wrote BS?

I'm also certain that S and T weren't reverse transcriptase and integrase. In the question it said that the RNA strand is inserted from the virus and it travels straight to the ribosome for translation - therefore reverse transcriptase and integrase wouldn't be required as they are only need for transcription of the viral DNA/RNA.

Also the question before that said to compare the differences between the way HIV infects cells and copies it's RNA, compared to how the common cold virus did. The main difference was the fact that HIV, and not the common cold, required the use of reverse transcriptase and integrase.

If the enzymes were not reverse transcriptase and integrase, what could they have been then?

This is what confused me. I took a guess and made us some BS saying that it might be RNA polymerase to help synthesise more RNA strands, and said another enzyme might be help make the capsid, or proteins on the capsid. These were both guesses though, most likely incorrect, but there was no need for the virus to have reverse transcriptase or integrase. I've looked through my textbook as well and I can't find any mention of any other specific enzymes that a virus might produce.

I put about skin being impenetrable, and that the skin was made of skin.
It formed a tough barrier.

No idea if it is right though.

Yh that's what I said and that its made of keratin? I've no idea...

Lol just noticed, that I have said that the "skin was made of skin". I meant keratin.

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Lol, yh
Did you guys notice - no graph questions! Or maybe I cant remember questions now O.o

I am pretty sure there was no data analysis questions, except for the question regarding the single celled chloroplast species, and the different abiotic factors.

For that question did you pick, that "There was a relationship between the distribution of the species, and both the abiotic factors" ?

I am pretty sure there was no data analysis questions, except for the question regarding the single celled chloroplast species, and the different abiotic factors.

For that question did you pick, that "There was a relationship between the distribution of the species, and both the abiotic factors" ?

Yepp

Cool, because I put that too. It was the last question I did actually, and at first I thought there was no relationship. But then I noticed that the distribution values were jumbled up. Got there in the end.

For the very first question. I don't remember it well, but it was about the organelles not found in prokaryotic cells.

I selected "Nucleus and Chloroplast"

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So I was right to think no graph questions



Which question that? can't remember. Is it the one about moisture and light intensity?
If that's what you are talking about, I put more affected by moisture presence because I noticed if the moisture was less, the presence was low too

Yeah that question. Too my eyes it felt like that both were affected by the abiotic factors. I dunno :/

If the enzymes were not reverse transcriptase and integrase, what could they have been then?

That sounds like a pretty good answer, it was just suggest so I'm hoping if we talked about any part of the cell membrane we will get the mark, I started rambling on about the phospholipid bi layer!

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