Out of these, which nitrogen base is NOT present in DNA?
Correct answer: C. Uracil
- A. Adenine
- B. Guanine
- C. Uracil
- D. Thymine
Explanation
Uracil: Uracil is not found in DNA. It is a nitrogenous base that is specific to RNA (ribonucleic acid) instead. In RNA, uracil replaces thymine as one of the four bases. Uracil forms a complementary base pair with adenine in RNA.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Macromolecules
Proteins are classified by shape, composition and structure, from primary amino acid sequence to secondary, tertiary and quaternary organisation, and their biological roles are linked to this structure. Enzymes are examined as protein biocatalysts, including active sites, substrate specificity, activation energy, cofactors and factors affecting activity.
Practise Macromolecules
299 free Macromolecules MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Macromolecules questions
Haemoglobin is a
Which one of the following amino acids is basic in nature?
Which of the following family is linked with plant ashes?
In basic conditions, amino acid exists in which of the following forms?
The principal energy storage carbohydrate in animals is:
A polymer in which the number of amino acid residue is greater than 100 or molecular mass is greater than 1000, is known as: