Which of the following combinations of base pair is absent in DNA?
Correct answer: C. A-U
- A. A-T
- B. C-G
- C. A-U
- D. T-A
Explanation
In RNA, nitrogenous bases form the usual complementary pairing, via cytosine (C) with guanine (G) and uracil (U) with adenine (A). In DNA, adenine (A) pairs up with a thymine (T) nitrogenous base instead of uracil (U).
Last updated
About Biological Molecules
The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
Practise Biological Molecules
1,790 free Biological Molecules MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.