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Bio Terms 11
chapter eleven terms u gnome
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Biology
01/23/2012

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Term
chemical messenger
Definition
a molecule that is secreted by one cell and that alters the activities of another cell
Term
gene
Definition
one or more segments DNA that together produce a functional RNA molecule
Term
gene expression
Definition
the synthesis of a protein from a gene
Term
genome
Definition
all the DNA molecules within a cell of an organism
Term
jumping gene
Definition
a gene that moves from one chromosome to another within a cell
Term
mutation
Definition
a change in the sequence of bases within a gene
Term
point mutation
Definition
a substitution, addition, or deletion of a single base within a gene
Term
retrovirus
Definition
an RNA virus that synthesizes a DNA copy of its genes and then inserts this copy into a DNA molecule
Term
ribosome
Definition
a spherical structure, formed of RNA and proteins, that serves as a site for protein synthesis
Term
virus
Definition
a cluster of organic molecules that uses the cell of an organism to reproduce itself