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Prokaryotes are helpful to humans because they...
-help plants utilize atmospheric nitrogen.
-can clean up toxic waste
-are used to make various foods.
-sythesize vitamins within our intestinal tracts.
The concept of evolution is based upon
survival and reproductive success of organisms with favorable variations
The oldest fossil organisms presently know have been dated at approximately how many years old?
Evolution is described as change from pre-existing life forms to modern-day organisms. What actually changed?
ability of organisms to cope with external stimuli
A carefully formulated scientific explanation that is based on a large accumulation of observations and is in accord with scientific principles
Prokaryotic cell walls function
to prevent the cell from bursting in a hypotonic (watery) environment
what is a normal inhabitant of a cow's digestive tract that can cause harm to people when it contaminates ground beef
When a virus takes over the machinery of a cell, it forces the cell to manufacture
more viral particles
Unlike aerobic prokaryotes, anaerobic prokaryotes can obtain energy when _____ is not available.
which environments would you normally find prokaryotes?
-a spoonfull of soil
-an animal's intestinal tact
-a single drop of saltwater
What do the sticky layers of protective slime produced by some bacteria enable them to do?
stick together and form biofilms
It appears that the pathogen responsible for "mad cow disease" also in human causes
Most scientists do not consider viruses to be "alive" because
their metabolic machinery is borrowed from the host cell.
Which is a swamp gas, intestinal gas, and explosive gas in a coal mine (killed miners recently)?
When not dividing, bacteria have ____ chromosome(s) and may have extra circles of_____ called plasmids.
tightly folded strands or circles of RNA and poses no protein coat. These bits of "naked" RNA cause many diseases in plants.
The validity of scientific discoveries cannot be based on
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