9700/12 Biology May Jun 2023 Online Test | Cambridge AS and A Level MCQ
CIE
AS & A Level
Biology (9700)
شهریور
2023
مشاهده نمونه سوال
شامل مباحث:
AS Level
تعداد سوالات: 40
سطح دشواری:
متوسط
شروع:
آزاد
پایان:
آزاد
مدت پاسخگویی:
75 دقیقه
پیش نمایش صفحه اول فایل
Neda Bani Meselson and Stahl investigated DNA replication by growing bacteria in a culture containing heavy nitrogen, ${}^{15}N$, until all the DNA was labelled.
These bacteria, the parental generation, were then transferred to a culture containing only light nitrogen, ${}^{14}N$, and allowed to replicate for two generations.
DNA was extracted from each generation of bacteria and its relative mass estimated. The flow diagram shows the results.
Which…
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