9700/12 Biology May Jun 2011 Online Test | Cambridge AS and A Level MCQ
Cambridge
AS & A Level
Biology (9700)
شهریور
2011
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
When solutions of dilute sodium hydroxide and copper(II) sulphate (biuret test) were added to an unknown substance, a purple colour was observed.
This test indicates the presence of which bond in the unknown substance?