9700/12 Biology Oct Nov 2024 Online Test | Cambridge AS and A Level MCQ
CIE
AS & A Level
Biology (9700)
بهمن
2024
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
Marila Lombrozo Bacteria were grown in a medium containing ${}^{15}N$. After several generations, all of the DNA contained ${}^{15}N$. Some of these bacteria were transferred to a medium containing the common isotope of nitrogen, ${}^{14}N$. The bacteria were allowed to divide once. The DNA of some of these bacteria was extracted and analysed. This DNA was all hybrid DNA containing equal amounts of ${}^{14}N$ and ${}^{15}N$.
Some bacteria from the medium with…
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