9700/13 Biology May Jun 2016 Online Test | Cambridge AS and A Level MCQ
CIE
AS & A Level
Biology (9700)
شهریور
2016
مشاهده نمونه سوال
شامل مباحث:
AS Level
تعداد سوالات: 39
سطح دشواری:
متوسط
شروع:
آزاد
پایان:
آزاد
مدت پاسخگویی:
60 دقیقه
پیش نمایش صفحه اول فایل
Neda Bani DNA is said to replicate in a semi-conservative way.
Results of Meselson and Stahl’s experiments gave overwhelming support to this theory. They used E. coli which has a generation time of 50 minutes.
Here are the stages occuring in their experiment but they are in the wrong order. ${}^{14}N$ DNA contains the ‘light’ isotope of nitrogen. ${}^{15}N$ DNA contains the ‘heavy’ isotope.
P All bacteria contain 15N DNA.
Q All…
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