A nucleoid is the part of a prokaryote, or single-celled organism, where genetic material for the cell is contained. Prokaryotes do not contain true nuclei or even organelles. Therefore, the genetic material for the organism exists in the nucleoid, which is a region in the cell without a membrane enclosing it.Continue Reading
According to How Stuff Works, nucleoids exist only in the oldest of organisms: the prokaryote. This organism only has one cell, which has no nucleus or organelles. While eukaryotes have a distinct nucleus where genetic material is replicated and surrounded by a protective membrane, prokaryotes only have the nucleoid, a region in the cell where the replication takes place and genetic material is found.
The genetic material of a prokaryote is called the genophore. The genophore has neither chromatin nor telomeres to support it during replication. Instead, it is compacted through a supercoiling mechanism into a circular shape. However, prokaryotes have cell walls, much like plants, and also have ribosomes and plasmids as seen in eukaryotic cells.
Prokaryotes are prmarily either bacteria or archaeans, a bacteria-like organism that is supposedly the link between bacteria and eukaryotes. Prokaryotes can survive in very inclement conditions, such as hydrothermal vents and hot springs.Learn more about Cells
Scitable explains that the central role of ribonucleic acid, or RNA, is to convert instructions written in the code of the organism's DNA into proteins. However, RNA is also involved in a number of other processes, such as signaling other cells and functioning as catalysts in cellular chemistry. Additionally, the ribosomes, which convert RNA into structural proteins, are themselves composed primarily of RNA.Full Answer >
Cell elongation is the lengthening of a cell during the cell differentiation process in the growth of a new organism or during movement in mature plants. Cell elongation occurs in both plants and animals.Full Answer >
As opposed to eukaryotic cells, which contain their genetic material inside a nucleus, prokaryotic cells allow their genetic material to float in the cell’s cytoplasm. In fact, prokaryotic cells lack any internal, membrane-bound organelles. While both types of cells use DNA as their primary genetic material, prokaryotes arrange their DNA in a simple circle, as opposed to bundling it into several chromosomes, as eukaryotes do.Full Answer >
The nucleus can be thought of as the control center of a eukaryotic cell because it contains most of the genetic material that carries the instructions for the cell's operations. Inside the nucleus, DNA directs the sequence of chemical steps needed for the synthesis of proteins and, by way of the proteins' action, it controls the metabolism of the rest of the cell.Full Answer >