i just did my gcse exam-want to know if i got some Qs right!

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jisaac
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i just did my gcse exam-want to know if i got some Qs right!

Post by jisaac » Wed May 21, 2008 1:41 pm

hi this question came up:
Give two uses of air bubbles in a fermenter, i said:
1)supplies oxygen to allow micro organisms in the fermenter to respire aerobically
2) i wasn't sure about this one but said: the air bubbles would help to distribute heat throughout the fermenter and keeps the microorganisms in suspension.

are these right?

Question 2:
why has the urine got a higher concentration of urea than the kidney filtrate?
i just had a guess and said that it was not reabsorbed back into the blood

HELP PLEASE!! :D

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