Monocots and eudicots are so named because of differences in the number of leaves on the .

Seed

Explanation: Monocots are flowering plants whose seeds have one cotlyedon (one leaf) while eudicots are flowering plants whose seeds have two cotyledons (two leaves). Another name for eudicots is dicots. Examples of eudicots are cashew seed, mango seed, avocado seed while examples of monocots are maize seed, palm kernel and coconut.

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.