Adenine and guanine are:
Correct answer: A. Main nitrogenous bases of nucleic acids
- A. Main nitrogenous bases of nucleic acids
- B. Main nitrogenous wastes of humans
- C. Main nitrogenous bases of phospholipids
- D. Main types of amino acids in proteins
Explanation
Option A is correct. Adenine and guanine are main nitrogenous bases of nucleic acids.Adenine (A) and guanine (G) are purines, which are a type of nitrogenous base. They are found in DNA and RNA, where they pair with thymine (T) and cytosine (C), respectively.Purines are made up of two rings of carbon and nitrogen atoms. The first ring is called the pyrimidine ring, and the second ring is called the purine ring. The purine ring contains two nitrogen atoms, while the pyrimidine ring contains one nitrogen atom.Adenine and guanine are the only two purines that are found in DNA and RNA. They are important for the structure and function of these molecules.
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