AQA Biology Unit 1 January A-S 2012 *EXAM FINISHED*

1) Describe inspiration
2) To treat TB, a combination of four drugs is often given. Explain why this is necessary?
3) What is a risk?
4) Why cant living things be ovserved in TEM?
5) Describe co transport

Reply 583

Original post by britash

Just lurking.
Staying up late to revise for a chemistry mock (that i didnt even know existed until about 20 minutes ago)... and i've not started learning chem properly yet :frown:

Spent all my time on biology and maths XD

Good luck.
haha we've been doing a question and answer session for HOURS. I'm so sad :'( :L

Reply 584

Original post by xDesertRose

1) Describe inspiration
2) To treat TB, a combination of four drugs is often given. Explain why this is necessary?
3) What is a risk?
4) Why cant living things be ovserved in TEM?
5) Describe co transport

1) External intercostal muscles contract, internal relax. Diaphram contracts, meaning that it flattens, and increases the volume of the thorax (or thoracic cavity). Also Ribs are pushed upwards and outwards, increasing vol of thorax. Increased vol of thorax = pulmonary pressure is lower, so atmospheric pressure is higher. therefore air is forced into the lungs
2) because there's different strains of tb? :s-smilie:

wtf
3) The chance that a hazard causes harm, so probability, e.g. 60%.
5) Co-transport --> sodium ions actively transported out of the epithelial cells via potassium sodium pump and goes into the blood. high sodium concentration in the lumen of the intestine than the cells, so when sodium enters again via a normal concentration gradient, glucose enters too, via a protein carrier, and is taken in. Then glucose is passed down into the blood via facilitated diffusion.

Reply 585

britash

2

Original post by EffKayy

Good luck.
haha we've been doing a question and answer session for HOURS. I'm so sad :'( :L

Yeah I watched for a bit :smile:

I might join in tomorrow or when you do it again as its a super good way to quickly revise and its almost *fun* haha XD

Reply 586

Original post by EffKayy

1) External intercostal muscles contract, internal relax. Diaphram contracts, meaning that it flattens, and increases the volume of the thorax (or thoracic cavity). Also Ribs are pushed upwards and outwards, increasing vol of thorax. Increased vol of thorax = pulmonary pressure is lower, so atmospheric pressure is higher. therefore air is forced into the lungs
2) because there's different strains of tb? :s-smilie:

wtf
3) The chance that a hazard causes harm, so probability, e.g. 60%.
5) Co-transport --> sodium ions actively transported out of the epithelial cells via potassium sodium pump and goes into the blood. high sodium concentration in the lumen of the intestine than the cells, so when sodium enters again via a normal concentration gradient, glucose enters too, via a protein carrier, and is taken in. Then glucose is passed down into the blood via facilitated diffusion.

2) some forms of m.tuberculosis do not respond to certain drugs / there is a greater chance that if all four are given one will be effective (i know aqa are -_-)
3)a measure of probability that damage to health will occur as a result of a given hazard (basically what u said)

Reply 587

anyone got a clue on what might come up as the two 5 mark q's im guessing it might be something on the heart

Reply 588

inyoursystem

Original post by xDesertRose

anyone got a clue on what might come up as the two 5 mark q's im guessing it might be something on the heart

or a question on tuberculosis or asthma etc.

Reply 589

Original post by inyoursystem

or a question on tuberculosis or asthma etc.

Wasnt that a question on Jan11 :s-smilie:

Reply 590

Original post by xDesertRose

anyone got a clue on what might come up as the two 5 mark q's im guessing it might be something on the heart

Breathing mechanisms I reckon.
Or cholera.
But we'll be fine :wink:

Reply 591

Mocking_bird

11

Original post by xDesertRose

1) Describe inspiration
2) To treat TB, a combination of four drugs is often given. Explain why this is necessary?
3) What is a risk?
4) Why cant living things be ovserved in TEM?
5) Describe co transport

1) External intercostal muscles contract, ribcage moves upwards and outwards. Diaphragm muscles contract and diaphragm flattens. This increases volume of thorax and decreases pressure inside thorax below atmospheric so air enters the lungs along a pressure gradient.
2) TB can mutate so there are different strains and it is necessary to ensure the treatment of tb is successful.
3) A risk is a factor which contributes to gaining a disease? Im not sure.
4) It is an electron microscope which requires a vacuum.
5) 2 molecules join together and travel together by facilitated diffusion through a carrier or channel protein.

Reply 592

Original post by EffKayy

Breathing mechanisms I reckon.
Or cholera.
But we'll be fine :wink:

Hopefully we will :biggrin:

Reply 593

I think ill call it a night, any longer and ill wake up at 11am :rolleyes:

Reply 594

Original post by Mocking_bird

1) External intercostal muscles contract, ribcage moves upwards and outwards. Diaphragm muscles contract and diaphragm flattens. This increases volume of thorax and decreases pressure inside thorax below atmospheric so air enters the lungs along a pressure gradient.
2) TB can mutate so there are different strains and it is necessary to ensure the treatment of tb is successful.
3) A risk is a factor which contributes to gaining a disease? Im not sure.
4) It is an electron microscope which requires a vacuum.
5) 2 molecules join together and travel together by facilitated diffusion through a carrier or channel protein.

Haha I said the same think about number 2 :frown:

but we're wrong fmllllllll

and number 3 - remember it's the CHANCE it will cause harm/damage etc :smile:

Omg we've revised loads but it doesnt seem like it :biggrin:

Reply 595

Original post by EffKayy

Haha I said the same think about number 2 :frown:

but we're wrong fmllllllll

and number 3 - remember it's the CHANCE it will cause harm/damage etc :smile:

Omg we've revised loads but it doesnt seem like it :biggrin:

Yeppp just need to do the same for chemistry and maths :colondollar:

Reply 596

Mocking_bird

11

Original post by xDesertRose

I think ill call it a night, any longer and ill wake up at 11am :rolleyes:

I have to be up by 7.30am, soooo going to be hard after i've been getting up at like 12 every day for 2weeks :colondollar:

Original post by EffKayy

Haha I said the same think about number 2 :frown:

but we're wrong fmllllllll

and number 3 - remember it's the CHANCE it will cause harm/damage etc :smile:

Omg we've revised loads but it doesnt seem like it :biggrin:

Yep! I'm pretty sure we've ran out of questions already hahah, besides the ones which require tables/graphs and all of that. Tomorrow i'll try and steal a couple of questions like that from past papers :P

Reply 597