The basic building block of a protein is called an amino acid. There are 20amino acids in the proteins you eat and in the proteins within your body, and they link together to form large protein molecules.
Active transport refers to a substance moving from areas in which it has low concentration to an area with high concentration, one example i guess is endocytosis, "<span>the taking in of matter by a living cell by invagination of its membrane to form a vacuole"</span>
<span>The chromosomes are lined up on the cell's equator during the Metaphase stage of mitosis. Almost immediately upon the cells lining up, the Anaphase stage begins, anaphase can be described as a migration of the two chromatids of each chromosome to the opposite spindle poles as they are pulled apart by the mitotic apparatus.</span>