As Unit 1 Biology AQA Jan 11

Yeah it was a glycosidic bond because it wasn't the bond between glycerol and a fatty acid.

Also, the 0.2 ratio thing...

I put 4 and 16?

0.1 of 20 is 2 so 0.2 is 4 and 0.8 is 16

Reply 63

rozevans

Original post by EffKayy

Think i got 5/5 and 5/5 but i lost the first mark as i put cellwall and i forgot sem disadvantages.. :frown:

I put membrane, but do we have to write plasma membrane or whatever?

I couldnt remember why TEM is better either! lol. I took a guess and said better resolution but i am pretty sure thats wrong from the pictures I have seen. I'm self taught external candidate so i have only seen text books and things.

i got .35 for the concentration where there was no mass change. almost put 3.5 which would have been a reeeeally stupid mistake!!

I got glycosidic bond wrong, but it was only a few marks so hopefully not too bad :s-smilie:

put 9 water molecules. counted all the Rs and then added one for the molecule lost between fructose and glucose.

Reply 64

Original post by Superlogon

the answer was ester bond

no it was not. ester bonds are not on the syllabus

Reply 65

Original post by stealth_writer

i just put glycerol is that right

yeh it only asked for one, I think

Reply 66

343arcou

5

I put glycerol and three fatty acids as well i put a glycocidic bond as ester is only between fatty acids i thought maybe be wrong

Also what did everyone put for water molecules released i put two as one for glucose and fructose and one for sucrose and fatty acid but depends on how many fatty acids joined???

Reply 67

how did everyone find the last 2 questions?

Reply 68

tehsponge

11

Original post by Jorgeyy

Yeah it was a glycosidic bond because it wasn't the bond between glycerol and a fatty acid.

Also, the 0.2 ratio thing...

I put 4 and 16?

0.1 of 20 is 2 so 0.2 is 4 and 0.8 is 16

I put 4 and 16 too :biggrin:

Reply 69

Ok so only mistakes i've identified:

Heart question choosing the 2 letters

Last 2 questions, probs lost half marks

Not bad, thanks LADs x

Reply 70

stealth_writer

4

What bout the hiv ones#???

Reply 71

EffKayy

16

Original post by rozevans

I put membrane, but do we have to write plasma membrane or whatever?

I couldnt remember why TEM is better either! lol. I took a guess and said better resolution but i am pretty sure thats wrong from the pictures I have seen. I'm self taught external candidate so i have only seen text books and things.

i got .35 for the concentration where there was no mass change. almost put 3.5 which would have been a reeeeally stupid mistake!!

I got glycosidic bond wrong, but it was only a few marks so hopefully not too bad :s-smilie:

put 9 water molecules. counted all the Rs and then added one for the molecule lost between fructose and glucose.

OMG YEAH i wrote 0.34-0.35 :P

no the tem is better because of the resolution! :smile:

thats right. :P

Reply 72

tehsponge

11

Original post by KingofSpades

how did everyone find the last 2 questions?

Got really confused by the tuberculosis one. There was so little space but so much to write. The Nelson Thornes textbook goes on for a page and a half about it... I paraphrased pretty much everything.

For the emhysema one, I wrote that the elastin is permanently stretched so smaller area for gas exchange also less air breathed in per minute due to difficulties in expiration. Then I wrote about how mitochondria need O2 for respiration which produces ATP for cell processes.

Reply 73

You mean HPV?

Remind me of the questions and i'll help ya

Reply 74

stealth_writer

4

Why do 12 to 13 yo girks have to have it

Reply 75

Rahul.S

14

how many water molcules were released....following tht ques where the first one was glycosidic, second glycerol.....

Reply 76

EffKayy

16

SO FAR:

lost the first mark.
put 70s ribosomes instead of 80s. :frown:

couldnt think of an SEM advantage.
got one of the heart letters wrong.
water molecule bond..
then the 0.2 ratio..

So.
6marks .. 54 so far.... dropped WAY more.

Reply 77

Original post by tehsponge

Got really confused by the tuberculosis one. There was so little space but so much to write. The Nelson Thornes textbook goes on for a page and a half about it... I paraphrased pretty much everything.

For the emhysema one, I wrote that the elastin is permanently stretched so smaller area for gas exchange also less air breathed in per minute due to difficulties in expiration. Then I wrote about how mitochondria need O2 for respiration which produces ATP for cell processes.

yeh I got the same pretty much. how did the general populous at your sixth form/college find it?

I'm trying to get an estimate as to the grade boundaries.

Did anyone else get 11 for the water molecules?

Reply 78

Jackbruce

Right someone needs to explain to me how the fook you do the calculation one. With the answer 0.44

Im really awful at converting units properly

Reply 79