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A level Biology: Post your doubts here!

Mahnoorfatima

Mahnoorfatima

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Mahnoorfatima said:
There's this question where it says: Explain how it is possible to reduce the no. of deaths during a cholera epidemic in countries such as those in W.Afrrica. In the ER it says that writing about washing hands and stuff is inappropriate. But why? I wrote that people who're infected should be advised not to handle cooking or utensils so that the bacteria doesn't go into the food and infects uninfected people or if they do, the should wash their hands first? Is this wrong? And also that proper sanitation facilities should be provided so that the bacteria doesn't remain in the faeces and infects other people. THIS IS DISGUSTING. :sick:
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Sombody? :rolleyes:
 
qwertypoiu

qwertypoiu

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Mahnoorfatima said:
Sombody? :rolleyes:
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Sorry I skipped your question, it's because I don't like the chapter on diseases but here's my best try:
When there is a cholera epidemic, I think it's usually because of natural disasters. So to say that they should wash their hands is inappropriate maybe because they simply don't have a place to wash hands. Afterall, they're not NOT washing their hands cuz they enjoy it right? I think you have to mention other things like medical aid, workers distributing clean water, and bla bla (TBH, I absolutely hate this chapter because it's always bla bla you have to write. I mean, you know the stuff but you don't know what the examiner wants you to write :( )
 
Midnight dream

Midnight dream

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qwertypoiu said:
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Sorry I skipped your question, it's because I don't like the chapter on diseases but here's my best try:
When there is a cholera epidemic, I think it's usually because of natural disasters. So to say that they should wash their hands is inappropriate maybe because they simply don't have a place to wash hands. Afterall, they're not NOT washing their hands cuz they enjoy it right? I think you have to mention other things like medical aid, workers distributing clean water, and bla bla (TBH, I absolutely hate this chapter because it's always bla bla you have to write. I mean, you know the stuff but you don't know what the examiner wants you to write :( )
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CAn't agree wid u anymore.....
Lola_sweet She loves this chapter.:p
 
qwertypoiu

qwertypoiu

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ashcull14 said:
HELLO>>???
qwertypoiu plzz this oneee
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lol sorry didn't see it.
1. Can carbon dioxide displace oxygen from haemoglobin? No. It can attach to it to make carbamino-haemoglobin, but this doesn't displace oxygen. As a molecule, CO2 is not able to directly affect oxyhaemoglobin. (Yes, high partial pressure of CO2 may make the haemoglobin let go of some oxygen, but this won't be considered complete displacement. besides it says which substance, so doesn't necessarily mean CO2 is in high partial pressure)
2. Carbon monoxide? Yes! CO is 250 times more strongly bondable to haemoglobin than oxygen. (and often irreversibly unfortunately) This IS complete displacement. It just goes binds with iron in haem group.
3. HCO3- ions? Nope. It just floats around in blood plasma does nothing to haemoglobin.
4. Hydrogen ions? Yes! It binds with haemoglobin to form haemoglobinic acid (HHb) which makes it change its shape and thus lose oxygen.

So D :)
 
A

ashcull14

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qwertypoiu said:
lol sorry didn't see it.
1. Can carbon dioxide displace oxygen from haemoglobin? No. It can attach to it to make carbamino-haemoglobin, but this doesn't displace oxygen. As a molecule, CO2 is not able to directly affect oxyhaemoglobin. (Yes, high partial pressure of CO2 may make the haemoglobin let go of some oxygen, but this won't be considered complete displacement. besides it says which substance, so doesn't necessarily mean CO2 is in high partial pressure)
2. Carbon monoxide? Yes! CO is 250 times more strongly bondable to haemoglobin than oxygen. (and often irreversibly unfortunately) This IS complete displacement. It just goes binds with iron in haem group.
3. HCO3- ions? Nope. It just floats around in blood plasma does nothing to haemoglobin.
4. Hydrogen ions? Yes! It binds with haemoglobin to form haemoglobinic acid (HHb) which makes it change its shape and thus lose oxygen.

So D :)
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its ok...i ws cnfused bout the 4th point anyways got it :)
 
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