Ribosomes assemble to make proteins. a) dna b)amino acids c) nucleic acids d) rna

The right option is; B)amino acids

Ribosomes assemble amino acids to make proteins.  

Ribosomes are cell organelles found within all living cells. Within a cell, ribosome may be bound to the endoplasmic reticulum, or it may be suspended in the cytosol. Ribosomes functions as the site of biological protein synthesis. They are responsible for assembling amino acids in the order specified by messenger RNA (mRNA) molecules. Ribosomes contain two parts; (i) the small ribosomal subunits (that read the RNA), and (ii) the large subunits, (that link amino acids to create a polypeptide chain).

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.