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30 Cards in this Set

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convergent evolution
similarity in structure in distantly related groups due to adaptation to the environment
derived character
a structural, physical, or behavioral trait that is present in a specific lineage and is not present in the common ancestor for several lineages
homology
similarity in structure due to having a common ancestor
phylogeny
the evolutionary history of a group of organisms
bacteriophage
a virus that parisitizes a bacterial cell as its host, destroying it by lytic action
archaebacterium
probably the earliest prokaryote; the cell wall and ribosomal RNA differ from those in other bacteria, and many live in extreme environments
cyanobacterium
a photosynthetic eubacterium that contains chlorophyll and releases oxygen; formerly called a blue-green alga
eubacterium
most common type if bacteria, including the cyanobacteria
virus
a non-living, obligate, intracellular parasite consisting of an outer capsid and an inner core of nucleic acid
amoeboid
protoctist that moves and engulfs prey with pseudopods; amoebalike in movement
conjugation
the transfer of genetic material from one cell to another
spore
asexual reproductive structure that is resistant to unfavorable environmental conditions and develops into a haploid generation
pseudopods
cytoplasmic extension of amoeboid protoctists used for locomotion and engulfing food
cephalization
development of a well recognized anterior head with concentrated verve masses and receptors
coelom
body cavity lying between the digestive tract and body that is completely lined with mesoderm
hermaphroditic
characterizes an animal having both male and female sex organs
pseudocoelom
body cavity lying between the digestive tract and body wall that is incompletely lined with mesoderm
ectothermic
having body temperature that varies according to the environment
endothermic
animal that maintains a body temperature that derived from oxidative metabolism of the organism
homeostasis
the maintenance of internal conditions in a cell or an organism by means of a self-regulation mechanism
artery
a blood vessel that transports blood away from the heart to the tissues
vein
a blood vessel that arises from venules and transports blood toward the heart
peristalsis
the rythmic, wavelike contraction that moves food through the digestive tract
differentiation
the specialization of early embryonic cells with regard to structure and fuction
angiosperm
a flowering plant; the seeds are borne within a fruit
cotyledon
seed leaf for embryonic plant, providing nutrient molecules for the developing plant before its mature leaves begin to photosynthesize
hybridization
the crossing of different varieties or species
mesophyll
inner, thickest layer of a leaf consisting of palisade and spongy mesophyll; the site of most photosynthesis
phloem
the vascular tissue that conducts organic solutes in plants; it contains sieve-tube cell and companion cells
transpiration
a plant's loss of water to the atmosphere, mainly through evaporation at leaf stomates