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Biology AQA B2&B3 Question Game 10th June 2016

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How's alveoli specialised to maximise diffusion?
How's villi specialised to maximise diffusion?
Original post by Abihun04
Preservation
Replacement by minerals
Casts and impressions (clay cast)


Fantastic!
Original post by Abihun04
Guard cells open and close the stomata, depending on the humidity and co2 levels outside the leaf. The palisade leaf cells have air spaces to maximise the gas exchange of oxygen and carbon dioxide!!

What is an allele?


It's the spongy mesophyll layer that has the air spaces
Original post by siobhanx13
How's alveoli specialised to maximise diffusion?
How's villi specialised to maximise diffusion?


Alveoli have moist lining, thin cell membranes and close to the good blood supply andlarge surface area
Villi have a large surface area and lots of them (making an even bigger surface area)
Original post by nerdyminion
It's the spongy mesophyll layer that has the air spaces

That's the one 👌🏻
Original post by siobhanx13
How's alveoli specialised to maximise diffusion?
How's villi specialised to maximise diffusion?


Alveoli :
Have a large surface area
Thin walls (decreases distance over which diffusion occurs)
Good blood supply
A moist lining for dissolving gases.

Villi:
Increases the surface area of small intestine
Single layer of cells (decreases distance over which diffusion occurs)
A good blood supply which maximises absorption into the blood

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Original post by ihatehannah
what are xylem and pholem tissues made from.


Xylem is made from dead cells stacked on top of each other, and phloem is made from living cells stacked on top of each other. The cells in both of these tissues form tubes.
Reply 67
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rlb2000
5
How does the kidneys get rid of any products that are not useful? (4)
Original post by nerdyminion
Xylem is made from dead cells stacked on top of each other, and phloem is made from living cells stacked on top of each other. The cells in both of these tissues form tubes.


Ask a question then...........I guess I shall go:

Name 4 things that Animals use Proteins for.
Original post by rlb2000
How does the kidneys get rid of any products that are not useful? (4)


Ultrafiltration: all the waste rosiest are not filtered back into the blood. The pass through the bowmans capsule and into the nephron. The nephron filters all the sugars, some water and mineral ions (through active transport) and leaves the waste products behind, like urea. Urea gets sent towards the bladder where it's stored before removed in urine
Reply 70
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rlb2000
5
Original post by Bulletzone
Ask a question then...........I guess I shall go:

Name 4 things that Animals use Proteins for.


Except from proteins are used for growth and development so they build things i have no idea... Help?
Reply 71
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rlb2000
5
Original post by Abihun04
Ultrafiltration: all the waste rosiest are not filtered back into the blood. The pass through the bowmans capsule and into the nephron. The nephron filters all the sugars, some water and mineral ions (through active transport) and leaves the waste products behind, like urea. Urea gets sent towards the bladder where it's stored before removed in urine

Great answer! probably will copy that one
Reply 72
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Saihan
1
Proteins are used as structural components of tissues, catalysts like enzymes, antibodies and hormones such as insulin and glucagon.
Reply 73
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Wahhaba
1
Explain how blood is circulated around the body. (6 marks)

OR

Explain why Arteries are thicker than Veins. (hint: blood pressure)
Original post by Wahhaba
Explain how blood is circulated around the body. (6 marks)

OR

Explain why Arteries are thicker than Veins. (hint: blood pressure)


The Arteries carry oxgenated blood away from the heart with high blood pressure, thus they have thick walls to withstand the pressure; Veins carry deoxygenated blood at low pressure.
give 3 possible effects on an increase of carbon dioxide in the atmosphere
Original post by rlb2000
Great answer! probably will copy that one

Sorry about the bad spellings and typos, typing fast
What pH does pepsin usually work in?
Original post by siobhanx13
I think so! We had an amazing teacher last year, so that helped a lot. And I'm sure you'll still do really well because you seam to care and have therefore put in a lot of effort!


I hope so :P Good luck for tomorrow!!
Original post by studentshavefun
What pH does pepsin usually work in?


pH 2?

What is mitosis and how does it work? (4 marks)

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