Final answer:
In nucleic acids, purines are the correct option as they form part of the structure of nucleotides, which include a phosphate group, a five-carbon sugar (ribose or deoxyribose), and a nitrogen-containing base (adenine or guanine for purines).
Step-by-step explanation:
The nucleic acids found in DNA and RNA include the purine and pyrimidine nitrogenous bases. Purines, which are adenine and guanine, are present in both DNA and RNA molecules. In the structure of nucleic acids, each nucleotide also contains a five-carbon sugar, which is deoxyribose in DNA and ribose in RNA, as well as a phosphate group. Thus, the components of nucleic acids are nucleotides, which include a phosphate group, a pentose sugar (ribose or deoxyribose), and a nitrogen-containing base (adenine, cytosine, guanine, thymine in DNA or uracil in RNA).
To answer which of the following is found in nucleic acids, the correct option is A) purines, because glycerol is found in lipids, R group refers to the variable side chain found in amino acids that make up proteins, amines are organic compounds and functional groups that contain a basic nitrogen atom with a lone pair, and carboxylic acid is another functional group present in various organic compounds, including amino acids, but not a standard component of nucleic acids.