What is the typical cell size of a protein and a virus?

answer:

a virus is an infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. they range in size from about 20 to 400 nanometres in diameter (1 nanometre = 10-9 meters). by contrast, the smallest bacteria are about 400 nanometres in size.

explanation:

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i'd say that the moon rock is about 2.2 billion years old.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.