https://padlet.com/1717016/vpw951sg8qav A bacterium, virus, or other microorganism that can cause disease. en-us 2016-12-19 14:53:59 UTC 2024-05-26 19:09:44 UTC hello@padlet.com 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144320429 an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.

]]> 2016-12-19 14:58:28 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144320429 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144320651 Because most viruses are extremely well adapted to their host organism, virus structure varies greatly. However, there are some general structural characteristics that all viruses share. All viruses have a capsid or head region that contains its genetic material. The capsid is made of proteins and glycoproteins.]]> 2016-12-19 14:59:16 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144320651 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144321173 A virus is basically a tiny bundle of genetic material either DNA or RNA carried in a shell called the viral coat, or capsid, which is made up of bits of protein called capsomeres. Some viruses have an additional layer around this coat called an envelope.]]> 2016-12-19 15:01:32 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144321173 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144321410 2016-12-19 15:02:29 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144321410 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144322501 Infectious diseases can be caused by: Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis. Viruses.]]> 2016-12-19 15:06:12 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144322501 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144323083 Bacteria constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a number of shapes, ranging from spheres to rods and spirals.]]> 2016-12-19 15:08:30 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144323083 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144323375 Bacteria are like eukaryotic cells in that they have cytoplasm, ribosomes, and a plasma membrane. Features that distinguish a bacterial cell from a eukaryotic cell include the circular DNA of the nucleoid, the lack of membrane-bound organelles, the cell wall of peptidoglycan, and flagella.]]> 2016-12-19 15:09:46 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144323375 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144323836 Bacterial cells have no nucleus and other organelles(sub-units within a cell with a specific function) bound by a membrane, except for ribosomes. Bacteria have pili, flagella and a cell capsule (most of them), unlike animal or plant cells. An organism without a nucleus is called a prokaryote.]]> 2016-12-19 15:11:44 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144323836 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144324188 Bacteria reproduce through a process called binary fission. During binary fission, the chromosome copies itself, forming two genetically identical copies. Then, the cell enlarges and divides into two new daughter cells. The two daughter cells are identical to the parent cell]]> 2016-12-19 15:13:17 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144324188 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144324511 Escherichia coli and Salmonella cause food poisoning. Helicobacter pyloricause gastritis and ulcers. Neisseria gonorrhoeae causes the sexually transmitted disease gonorrhea]]> 2016-12-19 15:14:40 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144324511 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144324935 A fungus is any member of the group of eukaryotic organisms that includes unicellular microorganisms such as yeasts and molds, as well as multicellular fungi that produce familiar fruiting forms known as mushrooms.]]> 2016-12-19 15:16:46 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144324935 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144325039

Most fungi grow as tubular filaments called hyphae. An interwoven mass of hyphae is called a mycelium.

The walls of hyphae are often strengthened with chitin, a polymer of N-acetylglucosamine. ...

Fungi disperse themselves by releasing spores, usually windblown. ...

Fungi are heterotrophic.

]]> 2016-12-19 15:17:17 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144325039 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144325338 The majority of fungi - except for the one-celled oranisms - are composed of hyphae; threadlike tubular filaments. Hyphae is the plural of hypha. A hypha has a rigid wall around it generally made of chitin. The outer skeletons (exoskeletons) of insects are also made of chitin.]]> 2016-12-19 15:18:34 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144325338 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144325428 Asexual Reproduction. Fungi reproduce asexually by fragmentation, budding, or producing spores. ... Mycelial fragmentation occurs when a fungal mycelium separates into pieces with each component growing into a separate mycelium. Somatic cells in yeast form buds.]]> 2016-12-19 15:18:54 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144325428 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144325695 Fungi feed on decaying matter, food and living organisms -- including humans. Fungi are abundant in the environment and some infect humans, causing disease. Surface infections such as athlete's foot and fungal nail infections are common. Fungi can also cause internal diseases called invasive fungal infections.]]> 2016-12-19 15:20:01 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144325695 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144326297 an organism that lives in or on another organism (its host) and benefits by deriving nutrients at the host's expense.]]> 2016-12-19 15:22:36 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144326297 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144326555

Reduced size for accommodation in the host.

Suitable shape for their hapitats.

Lack of senses or locomotary organs.

Presence of thick,resistant outer covering.

Presence of specialized mouth parts.

Presence of penetrating and attachment organs.

]]> 2016-12-19 15:23:47 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144326555 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144327126 A parasite is an organism that lives in another organism, called the host, and often harms it. It is dependent on its host for survival - it has to be in the host to live, grow and multiply.]]> 2016-12-19 15:25:42 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144327126 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144327842 A host in which parasites reproduce sexually is known as the definitive, final or primary host. in intermediate hosts, parasites either do not or do asexually, but the parasite always develops to a new stage in this type of host. ... The larger parasitesare worms which reproduce by laying eggs.]]> 2016-12-19 15:28:11 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144327842 1717016 https://padlet.com/1717016/vpw951sg8qav/wish/144328322 Around 70% of parasites are microscopic in size, such as the malarial parasite; however, some worm parasites can reach over 30 m in length. There are three main types of parasitic diseases: Protozoa: a single-celled organism. Plasmodium, which causes malaria,]]> 2016-12-19 15:30:11 UTC https://padlet.com/1717016/vpw951sg8qav/wish/144328322