Which one of the following statements best describes the first thing researchers need to do to manipulate dna?
a. gel electrophoresis would be used to separate fragments of dna.
b. restriction enzymes would be used to cut the dna into smaller pieces.
c. single-stranded dna fragments would be placed with dna polymerase in a test tube.
d. researchers would need to separate synthesized strands by size on a gel.

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.