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Bacteria and Viruses
Transcript of Bacteria and Viruses
Kinds of Monerans
MORE THAN 10,000 kinds of monerans.
Reproduction in Monerans
Reproduce by splitting to form two identical cells (fission)
genetic material in the cytoplasm of the cell reproduces itself
cell wall pinches inward and divides the cell, forming two new cells
each new bacterial cell has its own copy of the genetic material
MILLIONS OF ORGANISMS!!!!
A monera is a one-celled organism that does not have a nucleus.
part of the smallest and simplest organisms in the world
found everywhere life can be
Feed on dead organic matter or on living things.
Monerans that contain chlorophyll.
1. Lack a nucleus.
2. Lack most cell parts typically found in plant or animal cells.
3. smaller than plant or animal cells
4. Its cell wall is made from different materials than plant cells.
GROUP 1: bacteria
GROUP 2: blue-green bacteria
They are in water, soil, air, and on and in the bodies of other organisms
Most live as single-cells but they may join a friend or they might become a gang with other bacteria
Carry out photosynthesis to make their own food
Can live a variety of places:
hot water of natural springs
on snow in the Arctic and Antarctica
Under ideal conditions, bacteria can reproduce every 20 minutes
Viruses: Alive or not alive?
Smaller than monerans
You need a very powerful microscope to see viruses
some are round
some look like sticks and spools
Viruses have unusual characteristics
NO CELL WALL
NO CELL MEMBRANE
IN FACT, A VIRUS ISN'T A CELL AT ALL!!!!!
is a tiny fragment of genetic material (either DNA or RNA) wrapped inside a capsule of protein.
They can reproduce but only within a cell or a host organism.
It cannot obtain or use energy on its own
fall between living world and nonliving world
They are not organisms but have characteristics of organisms
Viruses are only active within the cells of living things
They are dangerous when they reproduce within cells. Some diseases viruses cause include:
Virus takes control of of the cell it infects, damaging and destroying the cell