AQA BIOL2 Biology Unit 2 Exam - 26th May 2011

Heirachy is just 'a group within groups', it represents the classification groups of 'Kingdom, Phylum, Class etc'.

'A big group containing smaller groups'

Hope that made sense?

1 mark, with no overlap = 2nd mark

Can someone help me with this?

Explain why the oxygen dissociation curve is Sigma shaped (s-shaped) 2 Marks

Can somebody please help me and answer this?

"Explain how the venous return of the blood to the heart is maintained?" (5 marks)

Thanks

Can somebody please help me and answer this?

"Explain how the venous return of the blood to the heart is maintained?" (5 marks)

Thanks

What is a tissue?

We've been taught that it's and aggregation of similar cells grouped together to carry out one specific task.

But the mark scheme says that they are of "common origin"

So is the definition we've been taught still correct?

Also what does it mean by switching on genes?
Apparently when cells differentiate their genes are "switched on"???

Antibiotics will kill bacteria. Bacteria is sometimes the site of which viruses can be taken in and modified to form new strands of viruses or reproduce the orignal virus. (I can't explain the theory as it is 'suggest'). Therefore in killing these bacteria would avoid production of viruses hence treating the viral disease. This is little from HSW from NT text book and most from my mind and not entirely sure..

There are many types of haemoglobin (Hb), this depends on on the DNA that has coded for it. Each Hb organism contains Hb best suited to the environment they live in and can only have that one structure of Hb through out all the RBC.
Example: People in high altitude have Hb with higher affinity for oxygen than people living in lower altitude, due to lack of abundant oxygen.

-In the other hand that single type of Hb can change its shape slightly in response to CO2 levels. (will not go through the process).

Hope you understand now.

Are you sure the question is not, suggest why antibiotics cannot be used to treat viral diseases?

when talking aout genes, what does it mean when it refers to the 'locus'?

any help appreciated, thanks!

Can somebody please help me and answer this?

"Explain how the venous return of the blood to the heart is maintained?" (5 marks)

Thanks

when talking aout genes, what does it mean when it refers to the 'locus'?

any help appreciated, thanks!

Thank you for your response, but I'm still a little confused. Also, what is RBC?


I thought there had been a mistake too, but that's definitely what the question says!

What is a tissue?

We've been taught that it's and aggregation of similar cells grouped together to carry out one specific task.

But the mark scheme says that they are of "common origin"

So is the definition we've been taught still correct?

Also what does it mean by switching on genes?
Apparently when cells differentiate their genes are "switched on"???

unlucky you, i got maths in the morning and biol2 in the afternoon, but your timetable is deadly, what subjects you doing ??

I got...Chem1 tomorrow, then day off, then general studies paper teehee), then on thurs afternoon biol2 and then friday I got economics unit 2 and chemistry unit 2! And it's my leavers day!

Can somebody please help me and answer this?

"Explain how the venous return of the blood to the heart is maintained?" (5 marks)

Thanks