9700/12 Biology May Jun 2021 Online Test | Cambridge AS and A Level MCQ
CIE
AS & A Level
Biology (9700)
شهریور
2021
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
Gama Admin Meselson and Stahl investigated DNA in bacteria. They grew bacteria in a medium with only heavy nitrogen, ${}^{15}N$, until all of the bacterial DNA contained only heavy nitrogen.
These bacteria were then moved from the heavy nitrogen medium and cultured in a medium with only light nitrogen, ${}^{14}N$.
Some bacteria were collected from each of the next three generations and their DNA was analysed.
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