9700/12 Biology Feb Mar 2018 Online Test | Cambridge AS and A Level MCQ
CIE
AS & A Level
Biology (9700)
خرداد
2018
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
Gama Admin A culture of bacteria had all its DNA labelled with the heavy isotope of nitrogen (${}^{15}N$). A sample was taken and spun in a centrifuge.
The diagram shows the position of the DNA band at Z in the centrifuge tube.
The culture was then allowed to reproduce using nucleotides containing the normal isotope of nitrogen (${}^{14}N$). Samples were taken and spun in a centrifuge after one generation and again after two generations.
In which…
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