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.
The cell membrane surrounds the cytoplasm. Nucleus: The nucleus is the central part of a cell, it is usually darker than the rest of the cell as it absorbs stain quickly. It is usually the largest structure inside the cell. Most cells have a central, single spherical nucleus but there are many variations. The nuclear membrane has a similar structure to the cell membrane but it contains gaps which allow protein to pass through.
Unit 10 1:1 identify the differences between bacteria, viruses, fungi and parasites. Viruses With the exception of newly discovered prions, viruses are the smallest agents of infectious disease. Most viruses are exceedingly small (about 20 - 200 nanometers in diameter) and essentially round in shape. They consist of little more than a small piece of genetic material surrounded by a thin protein coating. Some viruses are also surrounded by a thin, fatty envelope.
Causes and spread of infection 1.1 Differences between Bacteria, Viruses, Fungi and Parasites: Bacteria are tiny microorganisms that belong to a group all by themselves; they usually exist in groups of millions at a time and can multiply and spread around anything they come into contact with. For example, a gram of soil will contain approximately 40 million living bacteria cells and a millilitre of fresh water will contain approximately 1 million living bacteria cells. Viruses are tiny organisms that can progress to mild or even severe illnesses in humans, all animals and plants. A virus is 100 times smaller than a single bacteria cell, however they are not alive, they cannot multiply on their own and they would need to enter a human or animal cell and take over the cell to help them multiply. A virus has three main parts; nucleic acid which is the core of the virus and holds the DNA; a protein coat which covers the nucleic acid to protect it and the lipid membrane which covers the capsid, however many viruses do not have a lipid membrane and are therefore called naked viruses.
| | | D) | All living organisms are composed of one or more cells. | | | | | | Feedback: Cell theory states: all living things are made of cells; cells basic units of structure and organization; cells arise only from previously existing cells. Most prokaryotic cells do not have specialized internal structures. | | 2 CORRECT | | A ____ contains polar and nonpolar ends, forming the plasma membrane. | | | A) | microtubule | | | B) | transport protein | |
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
Minimal medium is the basic food supply that is needed to support the wild-type mould. Complete medium has all nutrients added. How did Beadle and Tatum produce mutant varieties of Neurospora? Beadle and Tatum exposed it to X-rays and UV radiation to produce mutant varieties. Beadle and Tatum grew hundreds of different spores.
It is made up of cells closely packed and ranged in one or more layers. This tissue is specialised to form the covering or lining of all internal and external body surfaces. Epithelial tissue that occurs on surfaces on the interior of the body is known as endothelium. Epithelial cells are packed tightly together, with almost no intercellular spaces and only a small amount of intercellular substance. Epithelial tissue, regardless of the type, is usually separated from the underlying
Advanced biology week 1 assignment 1. Bacteria are prokaryotes because they are not living organisms; they are simply genetic information wrapped in a protein sheath and they cannot replicate without the help of a cell. 2. Coccus bacteria is bacteria have a spherical shape. In nature, these bacteria may exist as individuals cells or be grouped together.
CAUSES AND SPREAD OF INFECTION [pic] HEALTH DIPLOMA LEVEL 2/3 UNIT 4223-008 |COMPLETED BY | |Date | | | | | | | |ASSESSED BY | |Date | | HSC 008-(1.1) Identify the differences between: Bacteria – 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