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Stack #84922
Bacteria and Viruses
Term | Definition |
---|---|
prokaryote | organism whose cells lack a nucleus |
bacillus | rod-shaped prokaryote |
coccus | spherical prokaryote |
spirillum | spiral or corkscrew shaped prokaryote |
chemoheterotroph | organism that must take in organic molecules for both energy and carbon |
photoheterotroph | organism that is photosynthetic but needs organic compounds as a carbon source |
photoautotroph | organism that uses sunlight energy to convert CO2 and H2O to carbon compounds |
chemoautotroph | organism that makes carbon molecules from CO2 using energy from chemical reactions |
obligate anaerobe | organism that does not require oxygen in order to live |
obligate aerobe | organism that requires a constant supply of oxygen in order to live |
facultative anaerobe | organism that survive with or without oxygen |
binary fission | type of asexual reproduction where an organism replicates its DNA and divides in half, producing 2 identical daughter cells |
conjugation | form of sexual reproduction where paramecia and some prokaryotes exchange genetic information |
endospore | type of spore formed when a bacterium produces a thick internal wall that encloses its DNA and a portion of its cytoplasm |
nitrogen fixation | process of converting nitrogen gas into ammonia |
virus | particle consisting of nucleic acid, protein, and in some cases lipids that can replicate only by infecting living cells |
capsid | outer protein coat of a virus |
bacteriophage | virus that infects bacteria |
lytic infection | process where virus enters a cell, copies itself, and causes the cell to burst |
lysogenic infection | process where a virus embeds its DNA into the DNA of a host cell and is replicated along with he host cell's DNA |
prophage | the viral DNA that is embedded in the host cell's DNA |
retrovirus | virus that contains RNA as its genetic information |
pathogen | disease causing agent |
vaccine | a preparation of weakened or killed pathogens |
antibiotic | compound that blocks the growth and reproduction of bacteria |
viroid | single-stranded RNA molecule that has no surrounding capsids |
prion | infectious particle made up of protein rather than DNA or RNA |