about bacteria for 5 min speech
Answers
Explanation:
Reproduction and transformation
Uses
Hazards
Resistance
The gut microbiome
History
Bacteria are microscopic, single-celled organisms that exist in their millions, in every environment, both inside and outside other organisms.
Some bacteria are harmful, but most serve a useful purpose. They support many forms of life, both plant and animal, and they are used in industrial and medicinal processes.
Bacteria are thought to have been the first organisms to appear on earth, about 4 billion years ago. The oldest known fossils are of bacteria-like organisms.
Bacteria can use most organic and some inorganic compounds as food, and some can survive extreme conditions.
A growing interest in the function of the gut microbiome is shedding new light on the roles bacteria play in human health.
What are bacteria?
Bacteria are single-celled organisms.
Bacteria are single-cell organisms that are neither plants nor animals.
They usually measure a few micrometers in length and exist together in communities of millions.
A gram of soil typically contains about 40 million bacterial cells. A milliliter of fresh water usually holds about one million bacterial cells.
The earth is estimated to hold at least 5 nonillion bacteria, and much of the earth’s biomass is thought to be made up of bacteria.
Types
There are many different types of bacteria. One way of classifying them is by shape. There are three basic shapes.
Spherical: Bacteria shaped like a ball are called cocci, and a single bacterium is a coccus. Examples include the streptococcus group, responsible for “strep throat.”
Rod-shaped: These are known as bacilli (singular bacillus). Some rod-shaped bacteria are curved. These are known as vibrio. Examples of rod-shaped bacteria include Bacillus anthracis (B. anthracis), or anthrax.
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