Spliceosome
A complex assembly that interacts with the ends of an RNA intron in splicing RNA; releases
an intron and joins two adjacent exons.
Springwood
Young, usually soft wood that lies directly beneath the bark and develops in early spring.
Spirochetes
Any bacterium of the genus Spirochaeta that is motile and spiral shaped with flexible
filaments. Spirochetes include the organisms responsible for leprosy, relapsing fever,
syphilis, and yaws.
Spongocoel
The central cavity of a sponge, which opens to the outside by way of the osculum.
Spongy parenchyma
In plant leaves, a tissue composed of loosely arranged chloroplast-containing parenchyma
cells.
Sporophyll
A leaf or leaflike organ that bears spores.
Sporangiophore
A specialized hypha or a branch bearing one or more sporangia.
Sporangium
A capsule in fungi and plants in which meiosis occurs and haploid spores develop.
Spore
In the life cycle of a plant or alga undergoing alternation of generations, a meiotically
produced haploid cell that divides mitotically, generating a multicellular individual, the
gametophyte, without fusing with another cell.
Sporophyte
The multicellular diploid form in organisms undergoing alternation of generations that
results from a union of gametes and that meiotically produces haploid spores that grow into
the gametophyte generation.
Spongy parenchyma
A leaf tissue consisting of loosely arranged, chloroplast-bearing, usually lobed cells. Also
called spongy parenchyma.
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