Edexcel A2 Biology SNAB 6BI04 ~ 6BIO5 June 2016

Original post by GrandMasti

3 differences between a stem cell and an insulin producing cell?

I went for: 1) Stem cells are undifferentiated; insulin cells are differentiated 2) stem cells found in bone marrow; insulin cells are in pancreas and 3) .... wait for it ... insulin cells produce insulin and stem cells do not ...... yes, that is the sound of the barrel being scraped in desperation!!!!!

Reply 1203

faheem97786

Ehat was the answer for investigating length of time for sea anemones to lose their habituation?

Reply 1204

Daniel9998

15

grade boundary predictions?

Reply 1205

nav1234567

4

Original post by Daniel9998

I dont think you had to talk about structure, think they were asking on how the building of DNA and RNA differ, meaning how DNA replication is different to transcription of RNA

and what do those building blocks have? Different structures.

Reply 1206

Daniel9998

15

Original post by nav1234567

and what do those building blocks have? Different structures.

well yeh they do have different structures, but the question was specifically asking you how building DNA differs to building RNA. Meaning the difference between DNA replication and transcription of RNA.

Reply 1207

Sebmooc

Original post by GrandMasti

Yes and the number stayed the same

I don't think the actin filament is shortened. It just moves relative to the myosin filament. I put that the area with only myosin (H zone) is shortened. Unless I misunderstood what question you were responding to :s-smilie:

Reply 1208

_H_V

4

Original post by Sebmooc

I don't think the actin filament is shortened. It just moves relative to the myosin filament. I put that the area with only myosin (H zone) is shortened. Unless I misunderstood what question you were responding to :s-smilie:

That's correct, filaments don't shorten, the label at the bottom( forget which letter it was) shortens, which is the width of the sarcomere

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Reply 1209

Original post by WhatALad

Yep

OMG YESSS! Is it correct?

Reply 1210

Original post by Anon113

What did people get for the nunber of sarcomeres?

1 sarcomere

Reply 1211

Original post by Daniel9998

dont remember the answer but I basically found the rate by calculating the gradient from 1-30 ,30-60 then 60-90, added up the values and divided by 3

0.055 or something

what were the units, min^-1

Reply 1212

Original post by FutureMedic97

How many UMS do I need at A2 to get an A if my AS was 257 UMS?
Am I correct in saying I need 480-257=223 which means it is a grade B? But I get an A overall?? Im confused

you need 480ums over as and a2 to get an A grade. So you're rite, you just need 223ums at A2 over all 3 units (including coursework). Even if you do get grade B in modules you can still get an A overall because its the UMS that counts

Reply 1213

Daniel9998

15

Original post by anonymouse.345

what were the units, min^-1

it was 2 marks so I very much doubt you had need to put units.

Reply 1214

MrSheeple

Original post by anonymouse.345

what were the units, min^-1

I think AU min^-1 (I forgot the AU part in the exam...)

What did everyone put for the 1 marker on why the synthetic DNA was kept in a closed circle until needed? I babbled some junk about not reacting and bonding with other stuff, but I really have no idea.

Reply 1215

HoldtheDoor

2

Original post by MrSheeple

I think AU min^-1 (I forgot the AU part in the exam...)

What did everyone put for the 1 marker on why the synthetic DNA was kept in a closed circle until needed? I babbled some junk about not reacting and bonding with other stuff, but I really have no idea.

I said so it can be stored for later use, as the plasmid acts as a vector.Your answer is more likely correct.

(edited 7 years ago)

Reply 1216

MrSheeple

Original post by HoldtheDoor

I said so it can be stored for later use, as the plasmid acts as a vector.Your answer is more likely correct.

I think yours makes more sense, actually. Because it isn't like they'd be storing their DNA in reactive substances anyway...lol

Reply 1217

moonandstars

8

do you guys know the result of your coursework?

Reply 1218

MrSheeple