Label the steps for protein synthesis in order, beginning with the first step. once the protein is made, the gene for a particular trait is expressed. mrna joins the ribosome, and the anticodons from trna join mrna to form a chain of amino acids. rna polymerase unzips dna and free rna nucleotides join dna to form mrna. a chain of amino acids is formed from peptide bonds, creating a protein. mrna is transported from the nucleus of the cell to the ribosomes of the cell.

answer: the correct option is d. enzyme

lactase and carbonic anhydrase are the examples of enzymes.

lactase is an enzyme, which is present in the small intestine of mammals. it in the digestion of the disaccharide, lactose ( milk sugar) by converting it into two monosachharide, which are glucose and galactose.

carbonic anhydrase is present in the red blood cells. this enzyme plays significant role in the transport of co₂. it in the conversion of co₂ and h₂o into carbonic acid, which is then dissociated into bicarbonate ions and hydrogen ions.

answer an inhibitory neurotransmitter in the brain;