9700/11 Biology Oct Nov 2015 Online Test | Cambridge AS and A Level MCQ
CIE
AS & A Level
Biology (9700)
بهمن
2015
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 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 was heavy.
These bacteria were moved from a heavy nitrogen medium and cultured in a medium with only light nitrogen, ${}^{14}N$.
A sample of bacteria was collected from the second generation and their DNA analysed.
Hybrid DNA contains both heavy and light DNA.
Which row…
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