Which pyrimidine base is found in RNA?
Correct answer: B. Uracil
- A. Thymine
- B. Uracil
- C. Cytosine
- D. Guanine
Explanation
Uracil is the correct answer as it is the pyrimidine base that is unique to RNA. In RNA, uracil pairs with adenine, replacing thymine, which is used in DNA. While cytosine is also a pyrimidine, it is present in both RNA and DNA, thus not making it unique to RNA. Guanine is a purine base, not a pyrimidine, which rules it out as an option. Thymine is only found in DNA, not RNA.
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.