Immunity Quiz (2) Biology AS & A Level
CIE
AS & A Level
Biology (9700)
فروردین
2010
شامل مباحث:
UNIT 11: Immunity
تعداد سوالات: 20
سطح دشواری:
متوسط
شروع:
آزاد
پایان:
آزاد
مدت پاسخگویی:
25 دقیقه
پیش نمایش صفحه اول فایل
omer uner Influenza is an infectious disease caused by a virus. It is possible to have influenza more than once.
Which statements explain why it is possible to have influenza more than once?
1- The viral antigens change as a result of mutations.
2- The immune system may be weak and make few B-memory cells.
3- Untreated HIV infection has resulted in a low T-helper…
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