9700/11 Biology Oct Nov 2023 Online Test | Cambridge AS and A Level MCQ
Cambridge
AS & A Level
Biology (9700)
بهمن
2023
مشاهده نمونه سوال
شامل مباحث:
تعداد سوالات: 40
سطح دشواری:
متوسط
شروع:
آزاد
پایان:
آزاد
مدت پاسخگویی:
60 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 ${}^{15}N$.
The remaining bacteria were left in the medium…
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