AQA BIOL5 ~ 17th June 2013 ~ A2 Biology

Ok IAA works in two ways.

in phototropism on shoots,IAA will move away from the light by diffusion and then cause elongation of cells on the shaded side.

In phototropism in roots, IAA will diffuse down to the shaded side, but as it's in a high concentration, growth will be inhibited, meaning the top side will grow more, bending roots towards the ground.

In geotropism in shoots, IAA will move to the underside of shoots so the cells will elongate and push the shoot away from gravity.

In geotropism in roots, IAA will move to the lower side, but growth will be inhibited, so the root grows downwards.

Some of them are stretching it to fit them in, and most are from the same units... i think thats pushing it

Yep
stimulus-->receptor----> sensory neurone-----> relay/intermediate neurone in spinal cord------> motor neurone-----> effector----> reponse

The response would be taking away our finger from it without actually thinking.
Why is this reflex arc important in us humans? (1mark)

hopefully it will be more like june12 and actually have bio 5 questions!

What unit that content is from is irrelevant. In order to get 3/3 for the breath marks you need to use topics from a range of areas such as bacteria, physiology, genetics etc and the marks for science is not dependant on what units the content comes from at all.

I know right! Thats what really pisses me off about AQA, we grind to study the specification and learn all the detail... yet they decide to ask ambiguous/unrelated questions... sort it out AQA

You call it science, I call it pervy scientists just like they were looking at snakes getting it on for unit 2...

What unit that content is from is irrelevant. In order to get 3/3 for the breath marks you need to use topics from a range of areas such as bacteria, physiology, genetics etc and the marks for science is not dependant on what units the content comes from at all.

You can also write about nitrogen cycle/ calcium ions and muscle contraction/ photosynthesis and hydrogen

loooooooooool !! how was bio 4 and 2?

What is physiology - what sort of topics? I'm guessing haemoclobin, things like thermoregulation... what elese?

Anybody really annoyed at the whole essay thing? Throughout my uni application I was encouraged to value quality over quantity; depth over breadth, but AQA seem to say "throw as much s**t as you can at this wall and hope some will stick."

Is it just me or is June 2011 horrible?

I thought the breath marks are for including information from at least 3 out of the 4 units... That's what i got told

Theres so many stuff on inorganic ions:

Sodium - pottassium pump in epithelial cells and nerve impulses

Calcium ions in synapses with vesicles/ calcium in muscle contraction activating ATPase and moving tropomyosin head out of myosin binding site on actin.

Nitrate ions and being used by plants

Inorganic phosphate ions in production ATP in respiration

Hydrogen ions both in light independent of photosynthesis and in oxidative phosphorylation

Fe 3+ ions in haemoglobin

H+ ions in chemoreceptors - when respiring a lot, more acidic - H+ detection by chemoreceptors