Section 4B Flashcards
Consolidation
aggregation of suspended particles in seawater of bacteria
Lithification
conversion of consolidated particles into a solid mad with mineral content
Sedimentation
settlement of water particles from suspension in water
Nitrogen fixation
conversion of atmospheric nitrogen into ammonium ion
Nitrogenase
enzyme used to fix nitrogen by breaking strong molecular is nitrogen gas; takes place in hetercost
Symbiotic bacteria
many bacteria have evolved symbiotic relationships with other marine organisms
endosymbiosis theory
body of evidence supporting the idea that some one called organisms have evolved by the incorporation of the other one called organisms of their organelles into host cell (fungi, plant, animals)
Eukarya
domain that contains all organisms with eukaryotic cells (plants, animals, fungi)
Phagocytosis
a cell engulfs a particle by inwardly folding and separation of the cell membrane to form a vacuole
plastids
an organelle in eukaryotic cell derived originally by endosymbiosis with a cyanobacterium (e.g. chloroplasts)
Endosymbiont
guest organisms or a organelle that lives within a host organism or cell
Hydrogen hypothesis
concept on the origin of eukaryotic cells that postulates an endosymbiont relationship between a host archaeologist that needed hydrogen for chemosynthesis and a guest bacterium that released hydrogen and become a mitochondrion
Plastid Endosymbiosis
evolutionary process by which a heterotrophic host cell gains the ability to photosynthesize from a photoautotroph guest cell
Deep-sea vent community
community of marine organisms that depend upon the specialized environment found at divergence zones in the ocean floor
chemosynthetic bacteria
can form organic molecules from inorganic molecules using other chemicals rather than sunlight as a source of energy
heterotrophic bacteria
Decomposers; use surrounding organic matter for materials and energy release exoenzymes to digest natural molecules, resistant to decay (cellulose)
Heterocost
specialized cell in which conditions favorable for nitrogen fixation are maintain - in cyanobacteria
Bioluminescent Bacteria
capable of emitting blue-green or yellow light using chemical energy
Photophores
an organ in some organisms that produces bioluminescence; contain cultures of luminescent bacteria
Archea
domain that contains archaeons which were formerly considered to be bacteria
Archaeons
ability to produce methane, and tolerance of extreme environmental conditions
3 Basic Archaeons
methanogens, halobacteria and hyperthermophiles
Methanogen
an archaeon that produces methane in its metabolism; are chemosynthetic and use hydrogen for energy (lives in deep sea hydrothermal vents)
Halobacteria
an archaeon that require high concentrations of salt where they live
Halophiles
an organism grows and reproduces best in the presence of salt
Bacteriorhodopsins
(purple proteins): like, capturing the protein that produces ATP and halobacteria
Hyperthermophiles
A microbe that grows in reproduces best at temperatures exceeding 100°C; live in deep sea, hydrothermal, hot events
Chemosynthetic, uses carbon dioxide and hydrogen to produce organic compounds