Eukaryote

Cells are divided into two categories namely the Prokaryotes and Eukaryotes. These two have varying differences between them. Speaking in simple cell biology words, prokaryotes are primitive, simple organisms that lack membranous cell organelles. The opposite of this are eukaryotes, which are advanced and complex organisms having membrane bound cell organelles. Seemingly simple in structure and markedly different from eukaryote and protist organisms, prokaryotic cells are believed to have been

this alone. Viruses have to inject its viral DNA into the host cell it has invaded in order to get the host to reproduce for it. Understanding living cells and distinguishing them from viruses There are two primary types of cells prokaryotes and eukaryotes. The key difference between the two is that the eukaryotic cells contain

organisms. Whilst all organelles are essential to eukaryotes, undoubtedly the nucleus is the most important. Yet, many argue that the mitochondrion or endoplasmic reticulum (ER) are equally if not more important to cellular function. Although both organelles have similarities with the nucleus and work with it to complete various functions it is evidential that the nucleus is more crucial. The Nucleus: The nucleus’ presence is used to classify cell as a eukaryote rather than prokaryote. The nucleus is the

defined taxon as a single taxonomic group of any level that is unique and independent from other groups. (Mayr, 1981) Since then, several diverse hypotheses were suggested and majority of scientists agreed to classify organisms into two major domains, eukaryotes and prokaryotes. At that time, the principle of two domains seemed to be fairly reasonable and was widely accepted amongst scientists. Since then, the same definitions for those two

Reflections on the Biology and Phylogeny of the Protozoa.’ (Chatton, 1925). Since then the term, when paired with its dichotomous counterpart ‘eukaryote’, has formed the fundamental basis for classification in biology. However in recent years the concept of the prokaryote has been wildly contested as being inaccurate (amongst other things), and the dichotomy of eukaryote/prokaryote based on a misleading and ultimately incorrect distinction that is phylogenetically contestable. This essay will examine the

Eukaryotes and prokaryotes There are only two types of cell in the world, these are eukaryotic and prokaryotic cells. They are both similar and different in many ways, for example prokaryotes are only a few micrometres in size whereas eukaryotes are between 5-100 micrometres and nearly 10,000 times the volume of that of a prokaryote. A chemical similarity between the two is that they both either contain or use proteins, carbohydrates, lipids and nucleic acids to store or create energy. Both eukaryotes

In general, viruses are a distinct group comparing to others. Viruses have similar characteristic as a living organism, but it also lack some of the element that a living organism have. Viruses are a hereditary material that may be single strand genome, or other may contain a double strand genome which is ribonucleic acid or deoxyribonucleic acid. Viruses are very small species, when a virus is not in contact with a cell, it is just a protein that contains a genome. In the other hand, when it is

the parent cell, divides to form two new cells, referred to as daughter cells. How this happens depends on whether the cell is prokaryotic or eukaryotic. There are differences of cell division for prokaryotes and eukaryotes cells. Cell division is simpler in prokaryotes than eukaryotes because prokaryotic cells themselves are simpler. Prokaryotic cells have a single circular chromosome, no nucleus, and a few other organelles. Eukaryotic cells, in contrast, have multiple chromosomes which are contained

source to break down carbon dioxide. These early prokaryotes were engulfed by other organisms, the earliest of the eukaryotes, in a process called primary endosymbiosis. Such cyanobacteria are still evident in the plastids found in modern eukaryotic plant cells. Their

Microorganisms are very tiny living organisms. They are microscopic and may be unicellular or multicellular (Madigan and Martinko 2006). The microorganisms include all prokaryotes and some eukaryotes. They are usually not visible to the naked eye, but some macroscopic ones can be seen with naked eye also (Max Planck Society Research News Released Accessed 15 September 2012). Microorganisms include bacteria, archaea, protozoa, fungi, algae and some members of the kingdom Animalia such as rotifers