What do glycine, leucine, and lysine all have in common?
they are the building blocks of proteins.
they have an important role in the heart.
they have a role in the functioning of the stomach.
they store equal amounts of energy in their bonds.

They are the building blocks of proteins.

Explanation:

Proteins are bio molecules which are polymers of monomeric units known as amino acids. Amino acids are joined by peptide bonds to synthesize large polymers which are known as proteins. So we can also say that the building blocks of proteins are amino acids.

Universal genetic code encodes 20 amino acids in total including leucine, glycine and lysine. So the common character that these three molecules share is that these are amino acids.

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