Author Topic: Question regarding AS level BIOLOGY!!  (Read 1446 times)

acielevel

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Question regarding AS level BIOLOGY!!
« on: November 14, 2009, 08:14:41 am »
I have some biology questions..


Q1.
does virus have a nucloid?? or a dna??
Can i know the components of virus??


Q2.
Is the mechanism of HIV ( endocytosis, reverse transcriptase etc etc)
and distinguishable four phases of HIV ,the methods to improve the immue system when caught by HIV , the drugs for it
all required in the biology AS syllabus?? did u guys learned about these things??
I checked with the cie bio syllabus but its very vague
and I am in a hurry as my bio test is on next tuesday, so I want to confirm with u guys whether i have to study these..


Please help me out to solve these questions..


      
« Last Edit: November 14, 2009, 08:19:42 am by acielevel »

Offline MaNi_DaDuDe

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Re: Question regarding AS level BIOLOGY!!
« Reply #1 on: November 14, 2009, 08:26:30 am »
I have some biology questions..

Q1.
does virus have a nucloid?? or a dna??
Can i know the components of virus??

Q2.
Is the mechanism of HIV ( endocytosis, reverse transcriptase etc etc)
and distinguishable four phases of HIV ,the methods to improve the immue system when caught by HIV , the drugs for it
all required in the biology AS syllabus?? did u guys learned about these things??
I checked with the cie bio syllabus but its very vague
and I am in a hurry as my bio test is on next tuesday, so I want to confirm with u guys whether i have to study these..


Please help me out to solve these questions..
      

This can help you the most, in my opinion. ----> http://encyclopedia2.thefreedictionary.com/Virus+%28biology%29

You do NOT need to know the mechanism and phases. Prevention.. maybe.

Too much info on here, but for reference purposes : http://en.wikipedia.org/wiki/Virus
http://www.biologyguide.net/unit1/4_bacteria_viruses.htm may help :\

[[EDIT]] :: ugh, its not showing its full size. .


well, the link to that image is - http://img.tfd.com/eb/72248.jpg
« Last Edit: November 14, 2009, 08:33:57 am by MaNi_DaDuDe »

Offline kratos009

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Re: Question regarding AS level BIOLOGY!!
« Reply #2 on: November 14, 2009, 09:06:10 am »
Um i'm not 100% sure but i'm pretty sure you don't need to know the stages of HIV. So far in the past papers that i've done the only thing they can mainly ask you is how does the infectious disease, HIV, spread from one to another and, recently i came across this question, why is vaccination of this disease proved to be problematic. So as far as i know you don't need to know about the stages of HIV. ;)

Offline MaNi_DaDuDe

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Re: Question regarding AS level BIOLOGY!!
« Reply #3 on: November 14, 2009, 09:16:55 am »
Um i'm not 100% sure but i'm pretty sure you don't need to know the stages of HIV. So far in the past papers that i've done the only thing they can mainly ask you is how does the infectious disease, HIV, spread from one to another and, recently i came across this question, why is vaccination of this disease proved to be problematic. So as far as i know you don't need to know about the stages of HIV. ;)

Problems with vaccination:

Viruses are constantly mutating and changing - the reason we cannot create a vaccine against the common cold or influenza- by the time we have, it'll have mutated and the vaccine will not be effective. These mutations are known as antigenic shift or drift. Also, diseases like malaria are eukaroytic in nature and have far more genes and thus antigens on their cell surfaces.

Also, people sometimes do not respond well to vaccinations, maybe because their immune system cannot handle it, or they do not have enough protein to make antibodies - and thus the vaccination attempt may infect them. Also, people infected with a live virus may pass it out in their faeces during the primary response, potentially infecting others. This is why we vaccinate everyone at the same time, known as herd immunity.

Some viruses evade attack by the immune system by living inside cells - plasmodium (causes malaria) enters the liver and red blood cells, protected against antibodies in the plasma. Some parasites cover their bodies in host proteins, so that the immune system cannot see them. Vaccines cannot be easily produced against these because there is a very short period of time for the immune response to occur before the pathogen hides.

acielevel

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Re: Question regarding AS level BIOLOGY!!
« Reply #4 on: November 14, 2009, 10:58:10 am »
thx a lot guys.
pheww, I will be able to save some time..
And thx for the links and explanation MaNi_DaDuDe.


anyways, did ur school also teached about the mechanism HIV and those stuff??
my school seems to have a tendency to teach a lot more in detail which is good and bad in the same time.    :)

Offline MaNi_DaDuDe

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Re: Question regarding AS level BIOLOGY!!
« Reply #5 on: November 14, 2009, 11:03:33 am »
thx a lot guys.
pheww, I will be able to save some time..
And thx for the links and explanation MaNi_DaDuDe.


anyways, did ur school also teached about the mechanism HIV and those stuff??
my school seems to have a tendency to teach a lot more in detail which is good and bad in the same time.    :)

Your welcome.

No, that is unnecessary.

We begged our teacher not to go into too many details as he made us do only one chapter in the 1st month (using that in-depth method). >.<

gl for the exam. I have phy  p2 on monday and bio p2 on tuesday. :(

acielevel

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Re: Question regarding AS level BIOLOGY!!
« Reply #6 on: November 14, 2009, 11:13:52 am »
Your welcome.

No, that is unnecessary.

We begged our teacher not to go into too many details as he made us do only one chapter in the 1st month (using that in-depth method). >.<

gl for the exam. I have phy  p2 on monday and bio p2 on tuesday. :(

I also have physics. But I am planning to study bio during this weekend as my basics for bio is terribly weak..
good luck for your exams too,  ;D
« Last Edit: November 14, 2009, 12:42:51 pm by acielevel »

Offline MaNi_DaDuDe

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Re: Question regarding AS level BIOLOGY!!
« Reply #7 on: November 16, 2009, 01:07:33 am »

I also have physics. But I am planning to study bio during this weekend as my basics for bio is terribly weak..
good luck for your exams too,  ;D

Okay gl for both

Offline hate alevels

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Re: Question regarding AS level BIOLOGY!!
« Reply #8 on: November 17, 2009, 04:33:53 am »
im sooooo nervous
I can't believe my exam is in 2hrs and a half
I hope its easy