In DNA replication: a) each new single helix is composed of 50 percent protein and 50 percent DNA protein.
b) each new triple helix is composed of one old DNA strand and two new DNA strands.
c) each new double helix is composed of one old protein strand and one new protein strand.
d) each new double helix is composed of one old DNA strand and one new DNA strand.

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.