S phase The synthesis phase of the cell cycle; the portion of interphase during which DNA is replicated. SA (sinoatrial) node The pacemaker of the heart, located in the wall of the right atrium. At the base of the wall separating the two atria is another patch of nodal tissue called the atrioventricular node (AV). sac fungi Members of the phylum Ascomycetes, these range in size and complexity from unicellular yeasts to minute leafspot fungi to elaborate cup fungi and morels. About half of the sac fungi live with algae in the mutualistic associations called lichens. saccule A chamber in the vestibule behind the oval window that participates in the sense of balance.
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S phase The synthesis phase of the cell cycle; the portion of interphase during which DNA is
replicated.
SA (sinoatrial) node
The pacemaker of the heart, located in the wall of the right atrium. At the base of the
wall separating the two atria is another patch of nodal tissue called the atrioventricular
node (AV).
sac fungi
Members of the phylum Ascomycetes, these range in size and complexity from unicellular yeasts to minute leafspot fungi to elaborate cup fungi and morels. About half of the sac
fungi live with algae in the mutualistic associations called lichens.
saccule A chamber in the vestibule behind the oval
window that participates in the sense of balance.
salivary amylase A salivary gland enzyme that hydrolyzes starch.
salivary glands
salt
saltatory conduction
saprobe
scarcomere
sarcoplasmic reticulum
saturated fatty acid
savanna
scaffolding protein
scanning electron microscope (SEM)
schizocoelous
Schwann cells
scion
sclera
sclereid
sclerenchyma cell
scrotum
scutellum
seascape
second law of thermodynamics
second messenger
secondary cell wall
secondary compound
secondary consumer
secondary growth
secondary immune response
secondary oocyte
secondary plant body
secondary production
secondary structure
secondary succession
secretion
secretory phase
sedimentary rock
seed
seed coat
seedless vascular plants
segmentation genes
segment-polarity genes
selection coefficient
selective channels
selective permeability
self-incompatibility
semelparity
semen
semicircular canals
semiconservative model
semilunar valve
seminal vesicle
seminiferous tubules
sensation
sensitive period
sensory adaptation
sensory division
sensory input
sensory neuron sensory reception sensory receptor
sensory transduction sepal septa
sequential hermaphroditism
serotonin seta
sex chromosomes sex-linked gene
sexual dimorphism sexual reproduction
sexual selection shared derived character shared primitive character
shoot system short-day plant
short-term memory sickle-cell disease
sieve plate
sieve-tube members sign stimulus
signal signal peptide
signal recognition particle (SRP)
signal-transduction pathway
signature sequences simple epithelium single nucleotide
polymorphisms (SNPs) single-lens eye
single-strand binding protein
sink habitat sinuses
sister chromatids skeletal muscle
sliding-filament model slow block to polyspermy
slow muscle fibers small intestine small nuclear
ribonucleoprotein (snRNP) smooth ER
smooth muscle snowball Earth social behavior
sociobiology
sodium-potassium pump solute
solution solvent
somatic cell somatic nervous system
somites soredia
sori source habitat
Southern blotting specialized transduction
speciation species
species diversity species richness species selection