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chapt. 11 test
robertson- vocab
35
Biology
9th Grade
02/14/2006

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Term
gene expression
Definition
the activation of a gene that results in the formation of a protein... includes transcription and translation
Term
operon
Definition
a series of genes that code for specific products and the regulatory elements that control these genes
Term
LAC operon
Definition
it's structural gene coded for the enzyme that regulates lactose metabolism
Term
structural genes
Definition
genes that code for particular polypeptides
Term
genome
Definition
the complete genetic material in an individual
Term
a repressor gene
Definition
protein that inhibits a specific gene from being expressed
Term
repression
Definition
the blockage of transcription by the action of the repressor protein
Term
regulatory gene
Definition
codes for the production of the repressor protein transcription of the structural genes are controlled by regulatory gene
Term
euchromatin
Definition
uncoiled DNA
Term
exons
Definition
section of a structural gene, when expressed is translated into proteins
Term
introns
Definition
sections of the structural gene that do not code for amino acids so they are not translated into protein
Term
pre-mRNA
Definition
a form of messenger RNA with both introns and exons
Term
enhancer
Definition
noncoding control sequence in a eukkaryotic gene
Term
transcription factor
Definition
regulates transcription by binding to the enhancers and RNA polymerase
Term
Promoter
Definition
DNA segment that recognizes RNA polymerase and thus promotes transcription
Term
operator
Definition
DNA segmant that serves as a binding site for an inhibitory protein that blocks transcription and prevents protein synthesis from occuring
Term
inducer
Definition
a molecule that initiates gene expression
Term
activation
Definition
the removal of the repressor protein and initiation of transcription
Term
Tumor
Definition
Abnormal proliferation- uncontrolled cell division
Term
tumor suppressor gene
Definition
gene that codes for protein and prevents uncontrolled rate of cell division
Term
benign tumor
Definition
non cancerous tumor

EX) warts, fibroid cysts
Term
malignant tumor
Definition
cancerous tumor



EX) breast cancer, skin cancer
Term
metastasis
Definition
the spread of cancer beyond the original site
Term
oncogen
Definition
gene that causes cancer
Term
proto0oncogen
Definition
controls cell growth and differentation
Term
cancer
Definition
malignant tumor
Term
carcinogen
Definition
any substance that causes cancer
Term
mutagen
Definition
change in genes
Term
lukemia
Definition
tumors grow in forming tissue
Term
sarcoma
Definition
grows in bones and muscle tissue
Term
morphogenesis
Definition
development of form in an organism
Term
cell differentation
Definition
development of cells having special features
Term
growth factor
Definition
genes that regulate proteins to ensure that cell division occurs in a proper sequence and correct rate
Term
homeobox
Definition
specific DNA within homeotic gene
Term
homeotic gene
Definition
regulatory gene that determines where certain anatomical structures will develop
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