Immunity

Question 1

explain how hiv effects the production of antibodies when aids develop in a person

Answer 1

1. less antibodies are produced
2. because hiv destroy helper t cells
   3 therefore few b cells are activated

Question 2

describe and explain the role of antibodies in stimulating phagocytosis

Answer 2

1.bind to antigen
2.antibodies cause aggultination

Question 3

describe the structure of hiv

Answer 3

RNA -as genetic material
reverse transcriptase
attachement proteins
phospholipid envelope
capsomered

Question 4

why do people with aids die when they are unable to produce an immune response

Answer 4

once infected by pathogen
pathogen reproduce
damage cells
release toxins

Question 5

describe how hiv is replicated

Answer 5

1 attachment proteins attach to receptors on helper t cells
2 nucleic acid enters the cell
3 reverse transcriptase converts RNA to DNA

Question 6

describe how the hiv is replicated once inside helper t cells

Answer 6

RNA is converted into DNA using reverse transcriptase
DNA inserted into helper t cell
DNA transcribed into RNA
HIV Mrna translated into new hiv proteins

Question 7

descibe how phagocytosis of a virus leads to a presentation of its antigens

Answer 7

1. phagosome fuses with lysosome
   2.virus destroyed by lysozyme
2. antigen from virus are dsplayed on the cell memnrane