small organisms that drift and float in water
tiny living things that can be seen only with a microscope
characteristics of living things
organization, order (complex structure), metabolism, growth, responsiveness, adaptation, regulation, reproduction.
(microbiology) single-celled spherical or spiral or rod-shaped organisms lacking nuclei that reproduce by fission.
Unicellular microorganisms : . Like bacteria, archaea have no true nucleus; ., domain which consists of single-celled prokaryotes that have distinctive cell membranes and cell walls (Archaeabacteria)
kingdom of one celled organisms with a nucleus
package of nucleic acid wrapped in a protein coat that must use a host cell's machinery to reproduce itself
protein coat surrounding the nucleic acid of a virus
organisms that make their own food
eat dead organisms and recycle their nutrients back into the ground (bacteria and fungi)
an organism that lives on or in a host and causes harm to the host
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