Wednesday, February 3, 2010

What is a bacteria, protist, and fungi?

Please include an easy-to-understand explanation for each of them. I think they're all decomposers? Thanks. =]What is a bacteria, protist, and fungi?
They are all microorganisms

Bacteria are considered organisms. Almost all bacteria are made up of one cell. They do not have a nuclear envelope nor do they have membrane bound organelles. Their chromosomes are circular. They are diverse in the molecules they use for food, as well as the habitats they occupy. They can be found at the bottom of the ocean, in boiling hot springs, and maybe even on other planets. Bacteria reproduce asexually. In cases where mutations are not an issue, and no genetic material has been transferred from other bacteria or viruses, the daughter cells will be identical to the parent.

Protists do have a nuclear envelope as well as other organelles. They have a cytoskeleton that gives them structure. It is common for protists to sexually reproduce but not always the case. They generally undergo cell division through mitosis. Protists have DNA within their nucleus that is “complexed with proteins called histones.” They can be made up of several cells and are larger than bacteria. Since they have membrane bound organelles, each cell can specialize in a given task. They can be parasitic, predatory or even photosynthetic in nature. They tend to live in areas that are moist.

Fungi are a group of organisms and micro-organisms that are classified within their own kingdom, the fungal kingdom, as they are neither plant nor animal. Fungi draw their nutrition from decaying organic matter, living plants and even animals. They do not photosynthesize as they totally lack the green pigment chlorophyll, present in green plants. Many play an important role in the natural cycle as decomposers and return nutrients to the soil, they are not all destructive. Fungi are even used for medical purposes, such as species within the penicillium genus which provide antibiotics, e.g. penicillin.

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