Bacteria obtain energy by either ingesting other organisms and organic compounds or by producing their own food. The bacteria that produce their own food are called autotrophs. Bacteria that must consume other organic molecules for energy are called heterotrophs.Know More
There are two general types of heterotrophs. Some heterotrophs supply all of their energetic needs by dissolving and absorbing or ingesting other organisms, and are called chemotrophic heterotrophs. By contrast, some bacteria produce some of their own energy by harnessing sunlight, but make up the balance of their energy needs by absorbing organic molecules.
Autotrophs also occur in two primary types. There are chemotrophic autotrophs, which absorb inorganic molecules, such as sulfides, and convert them to energy, as well as phototrophic autotrophs that produce their own energy by absorbing sunlight. As a whole, bacteria obtain their energy in a variety of ways, enabling some type of bacteria to live almost everywhere.
Aside from these four groups of bacteria that obtain energy in different ways, bacteria respire in different ways as well. Many organisms are aerobic, and rely on oxygen, just as animals do. Other bacteria are anaerobic, meaning that they live in an environment without oxygen. Still other bacteria can live in either oxygen-rich or oxygen-depleted environments. These flexible bacteria are called facultative anaerobes.Learn more about Cells
Some bacteria manufacture and absorb their own food, while others must consume substances like living organisms or decaying material through their cell walls. Bacteria break down food in a process called respiration, which for some strains of bacteria requires oxygen to complete.Full Answer >
Negative stains don't colorize cells because the cell wall of the bacteria repels the dye. The dyes used for negative stains are acidic and do not penetrate the negatively charged cell walls. Because of this, only the background of the slide will be colored.Full Answer >
Cells are considered the smallest unit of life because they are the smallest components in living things, and some organisms, such as bacteria, are made up of single cells. In addition, each part of the animal body, including blood vessels, organs and skin, is made up of a congregation of cells.Full Answer >
According to Reference.com, cellular organisms that do not have a distinct nucleus, such as bacteria, are called prokaryotes. They are distinct from the eukaryotes, which are the cellular organisms that contain a nucleus.Full Answer >