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AQA AS Unit 1 Biology Exam 21st May 2015

Reply 180

cheesytoast

Also can somebody list all of the equations we need to know for the exam? Thanks :smile:

Reply 181

Mr_Cupcakes

2

Original post by cheesytoast

Also can somebody list all of the equations we need to know for the exam? Thanks :smile:

Pulmonary ventilation = ventilation rate x tidal volume
Cardiac output = Stroke volume x heart rate
Magnification = size of image / actual size

Reply 182

Earth1

9

Original post by cheesytoast

If I got 2 b's in my exams (worth 80%) and a d in my coursework (worth 20%) would I still get a b? Thanks :smile:

You might possibly, It depends on how high your scores. I think i got a U in my ISA and i am predicted an A so somehow i need to get full marks in both papers. hahaha :smile:

Reply 183

holly.kay98

1

Original post by cheesytoast

Also can somebody list all of the equations we need to know for the exam? Thanks :smile:

For Unit 1 you need

Magnification= Image/Actual
Ficks Law= (Surface Area * concentration difference)/diffusion distance
Pulmonary Ventilation= tidal volume * ventilation rate
Cardiac Output= heart rate * stroke volume

I think thats it apart from basic maths like % change on how science works questions :smile:

Reply 184

S.Ahmad

10

Main tests:

Reducing Sugars:
Add benedicts reagent to the solution and boil. If a copper oxide precipitate forms then reducing sugars are present.

Non-reducing Sugars:
Add HCl and water to the solution and boil. Hydrochloric acid hydrolyses disaccharides into monosaccharides by adding water to the glycosidic bonds holding them together.
Add Sodium Hydrogen carbonate (Sodium bicarbonate) to neutralise the acidity of the HCl and then carry out the test for reducing sugars.

[Summary] Hydrolyses disaccharides which aren't reducing sugars (apart from lactose) into monosaccharides which are reducing sugars.

Starch:
Add potassium iodide and if a blue/black layer forms then starch is present.

Lipids:
Add ethanol and water. If a white emulsion forms then lipids are present.

Proteins:
Add Biuret reagent (Sodium hydroxide and copper sulphate) to the sample, if a purple colour is present then proteins are present (peptide bonds to be exact).

(edited 8 years ago)

Reply 185

Earth1

9

Original post by cheesytoast

If I got 2 b's in my exams (worth 80%) and a d in my coursework (worth 20%) would I still get a b? Thanks :smile:

Can you please give the indication of what the ISA grade boundary going to be for this year. Thank you :smile:

Reply 186

Uberphuq

9

Any predictions for the 5 markers at the end? (This is my second time sitting the paper :'( )

Reply 187

Xenon1305

7

Original post by Uberphuq

Any predictions for the 5 markers at the end? (This is my second time sitting the paper :'( )

They're usually to do with either the lungs (COPD stuff) or the heart - CHD stuff

Reply 188

Uberphuq

9

Original post by Xenon1305

They're usually to do with either the lungs (COPD stuff) or the heart - CHD stuff

I know this, I was wondering whether anyone had been through to see what hasn't come up ina while :smile:

Reply 189

Kill3er

13

Do you have to know about internal and external intercostal muscles? Sometimes i just see 'intercostal muscles' in the mark scheme, referring to just the external ones?

Reply 190

username1533709

5

Original post by Kill3er

Do you have to know about internal and external intercostal muscles? Sometimes i just see 'intercostal muscles' in the mark scheme, referring to just the external ones?

Posted from TSR Mobile

I asked my teacher about this.No you don't,just say intercostal muscles 😃.

Reply 191

thenextchemist

OP

21

Does anyone have a list of all the organelles and their functions because some of them are wrong in the textbook as this isn't said in the Mark schemes

Thank you

Posted from TSR Mobile

Reply 192

Ezme39

19

Original post by Bloom77

Does anyone have a list of all the organelles and their functions because some of them are wrong in the textbook as this isn't said in the Mark schemes

Thank you

Posted from TSR Mobile

The ones I've 100% seen in mark schemes:
Mitochondria - aerobic respiration
Golgi body - modification of proteins
Ribosomes - protein synthesis

Reply 193

Kill3er

13

Original post by Kadak

Posted from TSR Mobile

I asked my teacher about this.No you don't,just say intercostal muscles .

Thanks

Reply 194

frances98

19

Original post by Bloom77

Does anyone have a list of all the organelles and their functions because some of them are wrong in the textbook as this isn't said in the Mark schemes

Thank you

Posted from TSR Mobile

Do you have the cgp guide? There all in thete

Posted from TSR Mobile

Reply 195

thenextchemist

OP

21

Original post by frances98

Do you have the cgp guide? There all in thete

Posted from TSR Mobile

Yeah I do
But they're not what the mark schemes want
It's okay
I'll look through all exam questions to find a proper answer
I kno the generic ones like nucleus and nucleus
RER AND SER I'm not sure about

thanks anyway

Posted from TSR Mobile

Reply 196

edward090

4

Original post by holly.kay98

For Unit 1 you need

Magnification= Image/Actual
Ficks Law= (Surface Area * concentration difference)/diffusion distance
Pulmonary Ventilation= tidal volume * ventilation rate
Cardiac Output= heart rate * stroke volume

I think thats it apart from basic maths like % change on how science works questions :smile:

Hhow would u apply these concepts to questions?

Reply 197

holly.kay98

1

Original post by edward090

Hhow would u apply these concepts to questions?

I wouldn't, I would only use them if i was asked to do a calculation :smile:

Reply 198

Ozy96

5

Retaking this unit. Can someone please explain why is amylase produced in the salivary glands aswell as in the pancreatic gland to breakdown starch? Surely it would break down into maltose at the start so what's the need for the extra amylase enzyme produced in the pancreas?

Reply 199

hibzmourad

1

Original post by Ozy96

Retaking this unit. Can someone please explain why is amylase produced in the salivary glands aswell as in the pancreatic gland to breakdown starch? Surely it would break down into maltose at the start so what's the need for the extra amylase enzyme produced in the pancreas?

i remember asking my teacher this at the beginning of the year and if i can recall correctly - salivary amylase acts on more simple carbohydrates and only partially does the whole process of converting it to maltose whereas pancreatic amylase acts on complex carbohydrates and completes the conversion of starch into maltose......

AQA AS Unit 1 Biology Exam 21st May 2015

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