ہوم / مشق / ایم ڈی کیٹ / حیاتیات / مدافعت اور بیماریاں
7 سوالات: ایم ڈی کیٹ حیاتیات، جوابات اور وضاحت کے ساتھ۔
Antibodies are produced by:
درست جواب: Plasma cells
When B lymphocytes are activated they become plasma cells, which make large amounts of antibody.
Which blood group is the universal donor for red blood cells?
درست جواب: O negative
O negative red cells carry no A, B or Rh antigens, so they are unlikely to be attacked in the recipient.
Rhesus incompatibility can cause problems in a pregnancy when:
درست جواب: The mother is Rh negative and the fetus is Rh positive
An Rh negative mother can make antibodies against the Rh antigens of an Rh positive fetus.
Which cells directly destroy virus-infected body cells?
درست جواب: Cytotoxic T cells
Cytotoxic T cells recognise infected cells and kill them.
Which of these is an example of passive immunity?
درست جواب: Antibodies passed from mother to baby through breast milk
In passive immunity the antibodies are received ready-made, so the baby makes no memory cells of its own.
Malaria is caused by:
درست جواب: Plasmodium, a protozoan
Plasmodium is spread by the bite of the female Anopheles mosquito.
The dengue virus is spread by:
درست جواب: Aedes mosquito
Dengue is carried by Aedes mosquitoes, mainly Aedes aegypti.