Diversity of Life 1.2
Learning Target: Bacteria are single-celled organisms without nuclei.
Learning Target: Bacteria are single-celled organisms without nuclei.
Review:
Organisms come in all shapes and sizes
All living things share common characterisics
Living things may be divided into 6 kingdoms
Organisms come in all shapes and sizes
All living things share common characterisics
Living things may be divided into 6 kingdoms
Part 1
What is bacteria?
Bacteria are the simplest form of life.
All bacteria are composed of just one cell without a nucleus.
A bacterium reproduces using binary fission.
What is bacteria?
Bacteria are the simplest form of life.
All bacteria are composed of just one cell without a nucleus.
A bacterium reproduces using binary fission.
Part 2
What does a bacteria cell look like?
Bacterial cells are different from the cells of other organisms. A bacterial cell is 1/10th to 1/20th the size of animal, plant, fungi, or protist cells. One important feature of the bacterial cell is the cell wall, which surrounds and protects the soft cell membrane like a rain jacket. They also have a tail-like structure called the flagella that helps them to move.
What does a bacteria cell look like?
Bacterial cells are different from the cells of other organisms. A bacterial cell is 1/10th to 1/20th the size of animal, plant, fungi, or protist cells. One important feature of the bacterial cell is the cell wall, which surrounds and protects the soft cell membrane like a rain jacket. They also have a tail-like structure called the flagella that helps them to move.
Part 3
Scientists classify bacteria by their external shapes.
Spiral-shaped bacteria occur in single strands.
Rod-shaped bacteria may occur in singly or in chains.
Round-shaped bacteria may occur singly or in pairs, chains, or clusters.
Scientists classify bacteria by their external shapes.
Spiral-shaped bacteria occur in single strands.
Rod-shaped bacteria may occur in singly or in chains.
Round-shaped bacteria may occur singly or in pairs, chains, or clusters.
Part 4
What is archaea?
Like bacteria archaea is also a single-celled organsim without a nucleus. Archaea are similar in size to bacteria, but share more characteristics with the cells of complex organisms like plants and animals.
What is archaea?
Like bacteria archaea is also a single-celled organsim without a nucleus. Archaea are similar in size to bacteria, but share more characteristics with the cells of complex organisms like plants and animals.
Archaea can survive in the largest range of environments. These environments can be very hot, very cold, or contain so much of a substance such as salt that most living things would be poisoned.
Methanogens: They take their name from methane, the natural gas they produce. These archaea die if they are exposed to oxygen. They may live in the dense mud of swamps and marshes, and in the guts of animals such as cows and termites.
Halophiles: live in very salty lakes and ponds. Dome halophiles die if their water is not salty enough. When a salty pond dries up, so do the halophiles. They can survive drying and being dividing again when water returns to the pond.
Thermophiles: They thrive in extreme heat or cold. They may live in hot environments such as hot springs, near hot vents deep under the sea, or buried many meters deep in the ice.
Halophiles: live in very salty lakes and ponds. Dome halophiles die if their water is not salty enough. When a salty pond dries up, so do the halophiles. They can survive drying and being dividing again when water returns to the pond.
Thermophiles: They thrive in extreme heat or cold. They may live in hot environments such as hot springs, near hot vents deep under the sea, or buried many meters deep in the ice.
Part 5
Bacteria are not classified by where they live but by what their role in the environment is.
Producers: Bacteria that transform energy from sunlight into energy that can be used by the cell.
Decomposers: Bacteria that get energy by breaking down materials in dead or decaying organisms. Decomposers help other organsims reuse materials found in decaying matter.
Parasites: Some bacteria live in a very close relationship either inside or on the surface of other organisms. Some of these bacteria may have no effect on their host organisms or host cells. Some bacteria help their hosts. Bacteria that harm their hosts are known as parasites.
Bacteria are not classified by where they live but by what their role in the environment is.
Producers: Bacteria that transform energy from sunlight into energy that can be used by the cell.
Decomposers: Bacteria that get energy by breaking down materials in dead or decaying organisms. Decomposers help other organsims reuse materials found in decaying matter.
Parasites: Some bacteria live in a very close relationship either inside or on the surface of other organisms. Some of these bacteria may have no effect on their host organisms or host cells. Some bacteria help their hosts. Bacteria that harm their hosts are known as parasites.
Part 6
Bacteria may help or harm other organisms.
Research and find the following:
2 examples of helpful bacteria and 2 examples of hurtful bacteria.
Bacteria may help or harm other organisms.
Research and find the following:
2 examples of helpful bacteria and 2 examples of hurtful bacteria.
Part 7
Organization of organisms with a dichotomous key.
Organization of organisms with a dichotomous key.