What is the difference between saturated and unsaturated fatty acids, dna and rna, and purine and pyrimidine?

The difference between saturated and unsaturated fatty acids lies in the chain links. The saturated ones have simple bonds and are more solid, the unsaturated ones, they have double ligature and that generates their fluidity.

DNA and RNA, are both nucleic acids but their difference lies in the monosaccharide that compose them: the DNA has the pentose of the deoxyribose type while the RNA has the pentose of the ribose type.

Purines and pyrimidines differ in the chemical composition of each, while purine has double rings fused, pyrimidine has a single ring (heterocyclic). The two classify the nitrogen bases of DNA and RNA, with adenine and guanine being derived from purine and derived from pyrimidine, cytosine, thymidine and uracil.

Explanation:

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

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i believe the answer is c