9700/12 Biology May Jun 2011 Online Test | Cambridge AS and A Level MCQ
CIE
AS & A Level
Biology (9700)
شهریور
2011
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 Scientists grew bacteria in a medium containing heavy nitrogen, ${}^{15}N$, as the only source of
nitrogen.
After many generations, all of the bacterial DNA contained heavy nitrogen.
These bacteria were then moved from the heavy nitrogen medium into a medium with only light
nitrogen, ${}^{14}N$.
Some bacteria were collected from each of the next three generations and their DNA was analysed.
Hybrid DNA contains…
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