<span>Each genus contains one or more species. There are 8 main taxonomic groups in biological classification. These are, from the most inclusive to the least inclusive: domain, kingdom, phylum, class, order, family, genus and species. Therefore, each genus contains one or more species.</span>
Mitosis goes in the order of PMAT, or Prophase, Metaphase, Anaphase, and Telophase.
Prophase is when the nuclear envelope breaks down and the chromosomes are visible. Metaphase is when the chromosomes line up in the middle. Anaphase is when the spindle fibers pull the centromeres apart. Telophase is when the chromosomes go to the opposite sides and the nuclear envelope reappears.
There are four nitrogenous bases involved.
A, T, C and G.
A:T and C:G
In eukaryotes, the DNA strands are linear, and DNA polymerase can't replicate the very ends of the DNA strands! These ends are "protected" by repeated sequences called "telomeres." Either the chromosome gets shorter with each replication, or else a special enzyme-nucleic acid complex called telomerase adds new telomeres to the ends. A prokaryotic chromosome is circular and thus does not have the problem of having ended.
<span>Eukaryotic DNA is wound around histones, coiled, and supercoiled -- to replicate it, there have to be unwinding mechanisms, and mechanisms to reduce the degree of coiling. In prokaryotes, the winding problem is much less, and there aren't any histones.</span>
