BIO P2-HOW DID IT GO????

[BlackVelvet]

53% is the correct answer.

shouldn't you have to give it by 3 significant figures? maaan don't tell me i got it wrong again

 

[Zohaib Sherazi]

No. The qst stated: "to the nearest whole number". You'll lose the accuracy mark.

 

[BlackVelvet]

well that's sad

 

[deathvalley]

how about last question of HIV part ???

 

[BlackVelvet]

the one about 'immune system until HIV antibody was produced?'

 

[deathvalley]

yes it is ,hope i don't get it wrong

 

[BlackVelvet]

Zohaib please tell us your answer for that you're like our marking scheme lol... Geez Im so nervous...

 

[lee91]

edited

 

[Zohaib Sherazi]

Ok i'll provide a checklist of major points:

-HIV enters the body, antigens are detected by T helper cells that attach to them and release cytokines
-T killer cells produce antibodies, B-Lymphocytes attach to the antigens and make antibodies
-Mitotic division takes place to increase the number of antibodies
-The cells that are attacked by the virus release histamines
-Again stimulating the Lymphocytes to produce antibodies specific to the antigen
-Cells in the lymph nodes for example display the antigens for the lymphocytes to detect them
-Memory cells are produced on second exposure though complete immunity is never achieved as HIV start destroying the immune system

Any 5.

 

[Zohaib Sherazi]

-There was positive correlation to some extent + data
-Though there are exceptions to it for example (data)
-Hence, the conclusion of the student is true to some extent.

 

[lee91]

edited

 

[Zohaib Sherazi]

No, the t-cells only.

 

[lee91]

edited

 

[Zohaib Sherazi]

T helper release cytokines. T killer release histamine.

 

[adnanbaig]

it was the easiest one i hve ever seen........

 

[noora]

hey mine didn't go well shut man i just saw da discussion forum

 

[arhama]

Hey...i have this minor query, kind of odd but i need to make sure...for the antibody question i wrote an overlong answer going beyond the given lines to describe my point so will the examiner continue to check it or cut marks for that? my writing is big man:-S
apart from that i wrote
"Upon invasion the macrophages engulf the pathogen and digest them with the help of lysosomes. they display the antigens on there cell surface membrane so B-cells recognizing them divide and produce plasma cells with antibodies to destroy pathogen. they also divide to form memory cells which on another invasion of the same pathogen would result in a quicker secondary response by immune system. The T-cells also divide to form cytotoxic cells which release toxics that kill infected cells. The T-cells also aggravate the phagocytosis and furthermore divide to form memory and suppressor cells which produce antibodies for secondary response and gradually terminate the immune response respectively."

people how much will i get out of 5?

 

[arhama]

and what should the answer be for the secondary and tertiary structure? question was for 5 marks

i wrote for ...secondary:"the amino acids are linked together with peptide bond. they also have alpha- helix and beta pleated sheets.

tertiary: the amino acids have ionic, covalent, hydrophobic and hydrophylic interaction between them which give the protein its specific 3-D structure. it also consists of disulphide bridges. tertiary structures have more than one polypeptide chain.

is it right?

 

[princesszahra]

i did p21
it was good
and i had no time management problem!

 

[ahmedkoura]

what about the question of
vaccination p2 first variant
really the exam wes too easy but i lost 3 marks but no problem gd luck to all with paper 3 practical