AQA BIOL2 Biology Unit 2 Exam - 26th May 2011

Mate, I am
and ive just found an incred technique for memorising provided you have already shortened your notes.

litterally imagine a place known to you ... and associate everything with vivid objects and make funny scenarios ..
e.g
imagine a river near you ... except its flowing with blood.......
then this massive rectangular boat splits into 4. flows with it ... (haemoglobin ..quartenary structure.. each strip of boat= pp chain..)
each strip has a Bright red block letter H ( represents haem groups) containing iron and giving it red colour.
then imagine 4 massive O2 phones flying into boat ( represents 4 molecules of oxgen haemoglobin can carry) imagaine loads of O2 phones as if they were flying around like the keys in harry potter 1st movies... and that that the boat is attracted to to the keys like a magnet ( high affinity with high partial pressure).
the boat now flows down the blood river making stops in places that do no not have any 02 phones around them ( respiring cells ....)
etcetc


i have been doing this 5 minutes for each topic... and its like i cant forget it ...
use sexy women ..
use whatever you want .. just make sure you can repeat the story..
its speeding up my revision like Mad...
i might even be able to get some sleep.
apparently this how the Memory champions of the world ... remember 32000 words/deck of cards with ease..
and its working for me

Can somebody tell me how to do the magnification question in the jan 10 paper q 1bii thanks.

I use this technique, I do it to memorise like a list of 50 + numbers. Understanding the material is equally as important because a lot of the q's test your understanding of the subject

Nice scenario btw

When is your BIOL2 exam? 1:30 right

Magnification = image / original size

What time is the exam tomorrow?

going over biol2...probz finish all papers by late 2night

Insects have an waterproof exoskeleton made of chitin which prevents unwanted water loss.
They have tracheae which lead to holes in the surface of their exoskeleton called spiracles that can close to prevent evaporation of water when the insect is inactive. Branching off from the tracheae are tracheoles: the site of gas exchange in insects.

Smaller insects and inactive ones just use diffusion for gas exchange.

Larger insects during intense activity (e.g. flight) require more ATP so cells need more oxygen (because muscle contraction increases, so need for ATP increases, so rate of resp increases, so more oxygen is required to maintain rate of resp). Larger insects increase their oxygen supply by pumping their abdomen so more air moves in and out of the trachea

Water is withdrawn from the ends of the tracheoles during exercise because oxygen diffuses faster in air than in water, and to decrease the pressure so that air is pulled in faster.

when insects respire an aerobically, they produce lactic acid in muscle cells which lowers the water potential :. so water diffuses from tracheoles into muscle cells by osmosis.this makes diffusion of O2 faster, so actively respiring cells get O2 quicker.

do we need to knw this stuff coz i didnt find in the syllabus.

No we don't.