asianangel86
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#1
Report Thread starter 15 years ago
#1
couple of questions for you guys.... i'm panicking hard.

1)give an advantage of lactase and other digestive enzymes being located in the plasma membranes of the cells lining the small intestine rather than being secreed into the lumen of the small intestine.

2) the absorption of galactose from the small intestine is reduced if the absorbing cells are treated with a respiratory inhibitor, such as cyanide. suggets an explanation for this.
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xsbrx
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#2
Report 15 years ago
#2
(Original post by asianangel86)
couple of questions for you guys.... i'm panicking hard.

1)give an advantage of lactase and other digestive enzymes being located in the plasma membranes of the cells lining the small intestine rather than being secreed into the lumen of the small intestine.

2) the absorption of galactose from the small intestine is reduced if the absorbing cells are treated with a respiratory inhibitor, such as cyanide. suggets an explanation for this.
Don't panic!

1 - enzymes can be adsorbed onto on the surface of cells lining the small intestine as this means the products of digestion can be right next to the cells that will absorb them. this means a faster rate of absorption as the molecules have a very short distance to diffuse.

2 - (this ones a bit of a guess!) cyanide is a competitive inhibitor so will block the carrier proteins in the plasma membrane. Hence galactose won't be able to cross the plasma membranes through these proteins so the rate of absorption would be reduced.
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-doll
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#3
Report 15 years ago
#3
Good luck for tomorrow ppl!!
xxx
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asianangel86
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#4
Report Thread starter 15 years ago
#4
thank you!! if i had any left i'd rep you!
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Misogynist
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#5
Report 15 years ago
#5
We're all going to fail. Yay. [I hope not]
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asianangel86
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#6
Report Thread starter 15 years ago
#6
ahhh we'll be fine. if nothing else, we can join the army together! yay!
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Misogynist
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#7
Report 15 years ago
#7
Polygenic Inheritance? Polyploidy? Gah.
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Erana
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#8
Report 15 years ago
#8
The respiratory inhibitor one is to do with galactose etc. being taken up by active transport. No respiration = no ATP, and we all know what that means

Sorry if this was too late for you, I'm on my usual cram schedule. (cram-get distracted-cram-distract-cram-oh, look, it's 3am...*collapse*)
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Waiwaichowchow
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#9
Report 1 year ago
#9
I can't believe this was 14 years ago wow
I've only just started my a levels
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Farooq Dhahir
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#10
Report 1 year ago
#10
same
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