A2 biology- "suggest questions"!!! Nightmare.

hi guys am really worried about the a2 suggest questions. because in the f214 paper i lost all the marks for suggest question which was about 12marks. making me receive a bad grade which is terrible. Can anyone give me advice on how to answer them and a revision method as I will be resiting it in June. any F215 tips are also welcome.

thanks

What board are you?

OCR by the looks of it, all I can recommend is finding as many of them questions as possible and working through them

Reply 3

Tabers

15

I'd do as many questions as possible (which there will not be many of) and then ask your teacher to look at them and give you advice. It's probably all about practice as it is the exam techniques it sounds like you are struggling with. But I'd ask your teachers for help.

Reply 4

dr90210

OP

3

Original post by Tabers

I'd do as many questions as possible (which there will not be many of) and then ask your teacher to look at them and give you advice. It's probably all about practice as it is the exam techniques it sounds like you are struggling with. But I'd ask your teachers for help.

yh last unit i did that exactly, did all past papers and for even other exam boards. but I will go ask my teacher for some suggestions and advice.

thanks

Reply 5

dr90210

OP

3

Original post by guitarmike456

What board are you?

OCR

Reply 6

gabby07

11

Hi guys, I don't know about you but my worst nightmare are suggest questions. So throughout this evening, I'm going to post some suggest questions related to the OCR syllabus up here for us to discuss:

Here's the first:

Stem cells can differentiate into specialised cells and tissues.
(a) There are about 23 000 genes in a human body cell.
The table below shows the number of genes that have not been switched off, in three different cells, A, B and C.
A 11 000
B 18 000
C 23 000

Suggest which of these cells is a totipotent stem cell.Give reasons for your answer. [2]

Reply 7

gabby07

11

SUGGEST QUESTION THREAD:

During the cardiac cycle, the pressure in the right ventricle rises to a maximum of about 3.3 kPa.

Suggest reasons for the difference between this pressure and the maximum pressure in the left ventricle, as shown in the graph. [3]

Screen Shot 2015-05-20 at 18.14.56.png

(edited 8 years ago)

Reply 8

Sara Sa

1

Just offer your own opinion and back it up with evidence. Use the P. E. structure [point and evidence]

Reply 9

pwatch510

1

Do you have the mark scheme for this question?

Reply 10

pwatch510

1

Original post by gabby07

SUGGEST QUESTION THREAD:

During the cardiac cycle, the pressure in the right ventricle rises to a maximum of about 3.3 kPa.

Suggest reasons for the difference between this pressure and the maximum pressure in the left ventricle, as shown in the graph. [3]

Screen Shot 2015-05-20 at 18.14.56.png

Do you have a mark scheme for this question or know which paper its from?

Reply 11

thomas.rhett

10

Original post by gabby07

Hi guys, I don't know about you but my worst nightmare are suggest questions. So throughout this evening, I'm going to post some suggest questions related to the OCR syllabus up here for us to discuss:

Here's the first:

Stem cells can differentiate into specialised cells and tissues.
(a) There are about 23 000 genes in a human body cell.
The table below shows the number of genes that have not been switched off, in three different cells, A, B and C.
A 11 000
B 18 000
C 23 000

Suggest which of these cells is a totipotent stem cell.Give reasons for your answer. [2]

C, C has the least number of genes switched off so it’s the least specialized of all 3 types of cells.

When totipotent stem cells differentiate into specialized cells, as a result of differential gene expression, more and more genes are progressively switched off by epigenetic modification in response to external signals e.g. growth factors, hormones etc. because products of genes switched off are not needed in the specific cell types they are differentiating into: e.g. gene for insulin will be switched off in cells differentiating into muscle cells.

Reply 12

macpatgh-Sheldon

20

Original post by gabby07

SUGGEST QUESTION THREAD:

During the cardiac cycle, the pressure in the right ventricle rises to a maximum of about 3.3 kPa.

Suggest reasons for the difference between this pressure and the maximum pressure in the left ventricle, as shown in the graph. [3]

Screen Shot 2015-05-20 at 18.14.56.png

Hi just trying to help anyone who is struggling. It is difficult to predict the answers for the full 3 marks, but I would think:-

a) The left ventricle has a thicker muscular wall
b) So it can beat harder/with more force and hence generate higher pressure [here 17 kPa]
c) The LV has to pump blood to the whole body/distant organs
d) The RV has to pump blood ONLY to lungs ["next door"]

M [specialist biology tutor]

A2 biology- "suggest questions"!!! Nightmare.

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