9700/13 Biology May Jun 2015 Online Test | Cambridge AS and A Level MCQ
Cambridge
AS & A Level
Biology (9700)
شهریور
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 Scientists grew bacteria in a medium containing heavy nitrogen, 15N, as the only source of nitrogen. After many generations, both strands of all of the bacterial DNA molecules contained heavy nitrogen.
These bacteria were then moved from the heavy nitrogen medium into a medium with only light nitrogen, 14N. The bacteria divided once to form the first generation and once more to form the second generation.
A sample…
پرسش و پاسخ های مشابه
سوال کنید یا به سوالات دیگران پاسخ دهید ...