Paper 1, May June 2005 | Cambridge AS - A Level Biology (9700) Past Papers
Cambridge
AS & A Level
Biology (9700)
شهریور
2005
مشاهده نمونه سوال
شامل مباحث:
AS Level
تعداد سوالات: 40
سطح دشواری:
متوسط
شروع:
آزاد
پایان:
آزاد
مدت پاسخگویی:
60 دقیقه
پیش نمایش صفحه اول فایل
Neda Bani In an experiment the proteins in the cell surface membrane of a living cell were labelled with a fluorescent dye.
A small area of the membrane was observed using a microscope. A laser was then used to permanently destroy the fluorescence of the dye molecules in this field of view.
The fluorescence in this field of view was later seen to return.
What does this experiment show?
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