What monomer is made up of a base, a sugar, and a phosphate group a. monosaccharide b. nucleotide c. phospholipid d. amino acid

The key in identifying monomers of biological macromolecules is to associate them together:

Monosaccharides are sugar units which make up carbohydrates
A base, a sugar (deoxyribose or ribose), and a phosphate group make up Nucleotides
Phospholipids aren't monomers of a macromolecule - they are the major constituents of cell membranes
Amino acids are the units which make up proteins

If you like my answer, please vote me a 'brainliest', so I can improve my site rank :-) - thanks!

Cis the