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Midterm Review
Vocabulary S
20
Biology
12th Grade
01/30/2008

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Term
saturated fatty acid
Definition
a fatty acid in which all the carbons in the hydrocarbon tail are conncected by single bonds thus maximizing the # of hydrogen atoms that can attach to the carbon skeleton.
Term
scanning electron microscope
Definition
a microscope that uses an electron beam to scan the surface of a sample to study details of its topography.
Term
second messenger
Definition
a small, nonprotein, water-soluble molecule or ion, such as calcium ion or cyclic AMP, that relays a signal to a cell's interior in response to a signal received by a signal receptor protein.
Term
secondary cell wall
Definition
a strong and durable matrix often deposited in several laminated layers for plant cell protection and support.
Term

secondary oocyte

Definition
a haploid cell resulting from meiosis I in oogenesis which will becoe an ovum after meiosis II.
Term
secondary structure
Definition
the localized, repetitive coiling or folding of the polypeptide backbone of a protein due to hydrogen bond formation between peptide linkages.
Term
seed
Definition
an adaptation for terrestrial plants consisting of an embryo packaged along with a store of food within a resistant coat.
Term
sister chromatids
Definition

replicated forms of a chromosome joined together by the centromere and eventually separated during mitosis or meiosis II.

Term
smooth ER
Definition
no ribosomes!
Term
spectrophotometer
Definition
an instrument that measures the proportions of light of different wavelengths absorbed and transmitted by a pigment solution.
Term
spermatogenisis
Definition
the continuous and prolific production of mature sperm cells in the testis
Term
spiral cleavage
Definition
a type of embryonic development in protostomes, in which the planes of cell division that transform the zygote into a ball of cells occur obliquely to the polar axis, resulting in cells of each tier sitting in the grooves between cells of adjacents
Term
spore
Definition
in the life cycle of a plant or alga undergoing alternation of generations, a meitotically produced haploid cell that divides mitotically, generating a multicellular individual the gametophyte, without fusing with another cell.
Term
sporophyte
Definition
in organisms undergoing alternation of generations, the multicellular diploid form that results from a union of gametes and that meiotically produces haploid spores that grow into the gametophyte generation.
Term
starch
Definition
a storae polysaccharide in plants consisting entriely of glucose.
Term
steroids
Definition
a type of lipid characterized by a carbon skeleton consisting of four rings with various functional groups attached.
Term
stomata
Definition
a microscopic pore surrounded by guard cells in the epidermis of leaves and stems that allows gas exchange.
Term
substrare-level phosphorylation
Definition
the formation of ATP by directly transferring a phosphate group to ADP from an intermediate substrate in catabolism.
Term
substrate
Definition
the reactant on which an enzyme works.
Term

synapsis

Definition

the pairing of replicated homologous chromosomes during prophase I of meisosis.

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