which is a primary component of a plant cell wall?; which statements correctly define the role of ribosomes in a cell?; what is the relationship between rough endoplasmic reticulum (er) and lysosomes; where are proteins synthesized?; which is the primary function of a vacuole?; how is it possible that plants can express firefly genes?; which structures do a rabbit cell and a bacterial cell have in common?; what role do ribosomes play in the central dogma of molecular biology?