Bacteria reproduces by most commonly occurs by a kind of cell division called binary fission. Binary fission results in the formation of two bacterial cells that are genetically identical. 6. The Archaea these microbes are prokaryotes, meaning that they have no cell nucleus or any other membrane-bound organelles within their cells. 7.
Unit 4222-265 Causes and spread of infection (ICO2) Understand the causes of infection 1. The differences between bacteria, viruses, fungi and parasites Bacteria belong to a group of single celled microorganisms which are classified as prokaryotes i.e. they do not have membrane bound organelles. They have no true nucleus as the DNA is not contained within a membrane or separated from the rest of the cell, but is coiled up in a region of the cytoplasm called the nucleoid and the cell is surrounded by a cell wall an outer covering that protects the bacterial cell and gives it shape. Viruses are infectious agents, often highly host-specific, consisting of genetic material surrounded by a protein coat.
QUESTION 1 A. Definition of terms: 1. Plasmid -An extra chromosomal genetic element that is not essential for growth and has no extracellular form. 2. Chemolithotroph - An organism that obtains its energy from the oxidation of inorganic compounds.
http://www.bio.davidson.edu/people/kabernd/berndcv/lab/epithelialinfoweb/simple%20squamous%20epithelium.html Cubodial Epithelial Cells Cubodial cells are obviously shaped like a cube, hence the name. Even though they may look hexagon in shape at the surface, if we cut into them we can see they are cubed in shape and contain a spherical nucleus. These types of tissue cells are classes as simple as they only consist of a single layer of cells. Those cells with numerous layers would be considered complex tissue cells. The function of the cuboidal cell is to provide a layer of protection against abrasions, foreign objects, invading bacteria
Not enclosed in a special nuclear membrane. Appear in several shapes; bacillus rod-like, coccus spherical or ovoid, spiral corkscrew or curved star-shaped or square. Individual bacteria may form pairs, chains, clusters, or other groupings; such formations are usually characteristic of a particular genus or species of bacteria. Bacteria grown in a given time in media are called a culture. A pure culture is often a clone, a population of cells from a single
1) Bacteria are living things that are neither plants nor animals, but belong to a group all by themselves. They are very small, individually not more than one single cell. However there are normally millions of them together, for they can multiply really fast. Bacteria are prokaryotes (single cells that do not contain a nucleus). They are ten to 100 times larger than viruses.
It is also free of a nuclear envelope, and the DNA is not packed into chromatin. Most of this DNA from the mitochondrion is inherited from the mother. This DNA is packed by
TASK 1 (P1) BACTERIA A) Labelled B) Bacteria is a single cell organism. They do not have a nucleus and are prokaryotic cells. Bacteria are simpler structures with no membrane bound organelles. A bacteria has a cell wall, plasma membrane, pilus, DNA, capsule and ribosomes. C) The average size of a bacteria is between the diameter of 0.5 to 5 µm.
Causes and spread of infection 1. Understand the causes of infection 1. Identify the differences between bacteria, viruses, fungi and parasites Bacteria is living things that are neither animals or plants but a group that belongs to themselves. Bacteria are prokaryotic microorganism, which is a single cell that doesn’t contain nucleus. Viruses are a small infectious agent that can multiply only inside living cells of organisms.
The presence of murein indicates that this is bacterial peptidoglycan as murein is never found in Archaea. Descending from the N-Acetyl Muaramic molecules are lypoproteins (stem peptides) consisting of D and L Amino Acids. A pentaglycine cross bridge joins the D-alinine and L-lysine Amino Acids, inter-linking the Disaccharide repeat regions. Teichoic acids are embedded in the plasma membrane (not shown in the diagram) they interweave through the peptidoglycan, attaching it to the bacterial cell. http://www.google.ie/imgres?q=peptidoglycan+diagram&hl=en&client=firefox-a&hs=5Jg&sa=X&rls=org.mozilla:en-US:official&biw=1173&bih=511&tbm=isch&prmd=imvns&tbnid=5DRtvUra9oY01M:&imgrefurl=http://pathmicro.med.sc.edu/fox/cell_envelope.htm&docid=0aWG7veP-RdY0M&imgurl=http://pathmicro.med.sc.edu/fox/sa-pep.jpg&w=567&h=488&ei=NSxVT6jrAYPvsgb85OzhCw&zoom=1&iact=hc&vpx=308&vpy=43&dur=4075&hovh=208&hovw=242&tx=128&ty=119&sig=112218279809207804119&page=1&tbnh=145&tbnw=168&start=0&ndsp=10&ved=1t:429,r:1,s:0 Peptidoglycan structure is slightly different between Gram positive bacteria (usually stain purple when Gram stained) and Gram negative bacteria (usually stain red when Gram stained).