The instructions for making proteins come originally from a) rna. b) ribosomes. c) dna. d) amino acids.

The correct answer is C) DNA.

DNA ( deoxyribonucleic acid) is the genetic material of all life forms. It carries information in the form of nucleotide sequences. DNA is transcribed into mRNA ( messanger RNA), which is then translated into specific proteins. mRNA contains sequences in the form of codon ( a triplet code of nitrogenous base for specific amino acid)

As mRNA is transcribed from DNA. Thus, instructions for making proteins originally comes from DNA.

According to the Central Dogma, genetic information is passed in this order-

DNA→ mRNA→ Protein

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.