Each hereditary trait corresponds to

a sequence of nitrogen bases
a step on the ladder
an arrangement of nucleotides
an enzyme

ysosomes are membrane-bound vesicles that contain digestive enzymes, such as glycosidases, proteases and sulfatases. lysosomal enzymes are synthesized in the endoplasmic reticulum (er), are transported to the golgi apparatus, and are tagged for lysosomes by the addition of mannose-6-phosphate label.

explanation:

satellites are frequently used to make observations of the orbit on earth