9700/11 Biology Oct Nov 2021 Online Test | Cambridge AS and A Level MCQ
Cambridge
AS & A Level
Biology (9700)
بهمن
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
Neda Bani Bacteria were cultured in a medium containing heavy nitrogen (${}^{15}N$) until all the DNA was labelled. These bacteria were then grown in a medium containing only normal nitrogen (${}^{14}N$) for five generations. The percentage of cells containing ${}^{15}N$ in each generation was estimated.
Which curve provides evidence that DNA replication is semi-conservative?
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