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Terms
biology terms
25
Biology
10th Grade
11/30/2008

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Term
chromatin
Definition
granular material visible within the nucleus, DNA coiled around proteins
Term
base pairing
Definition
principle that bonds in DNA, can form only between Adenine & Thymine or Guanime & Cytosine
Term
nucleotide
Definition
monomer of nucleuc acids made up of 5 carbon sugar phosphate group & notrogenous base
Term
transformation
Definition
1 strain of bacteria is changed by gene to otherbacteria
Term
bacteriaphage
Definition
virus that infects bacteria
Term
messenger RNA
Definition
RNA molecule that carries copies of instructions for the assembly of amino acids to protein from DNA to cell
Term
DNA polymerase
Definition
enzyme that "proof-reads" new DNA strand, checks to see molecules are exact copies of origional DNA
Term
replication
Definition
copying process; cell duplicates its DNA
Term
histone
Definition
globular protein molecule around which DNA is coiled in chromatin
Term
RNA polymerase
Definition
enzyme like DNA polymerase that binds to DNA strands during transcription
Term
transcription
Definition
process where part of nucleotide sequences of DNA is copied into compementary sequence in RNA
Term
transfer RNA
Definition
type of RNA; transfers amino acids to ribosomes during protein synthesis
Term
ribosomal RNA
Definition
type of RNA; makes up major part of ribosomes
Term
codon
Definition
3 nucleotide sequence on messenger RNA. codes for single amino acid
Term
exon
Definition
expressed sequence of DNA; codes for protein
Term
intron
Definition
intervining sequence of DNA; does not code for protein
Term
promoter
Definition
region of DNA that indicates to an enzyme where to bind to make RNA
Term
point mutation
Definition
mutation that affects single nucleotide usually substituting one for another
Term
mutation
Definition
change in DNA sequence that affects genetic info
Term
anticodon
Definition
group of 3 bases on + RNA molecule that are complimentary to mRNA codon
Term
translation
Definition
decoding of mRNA message into polypeptide chain
Term
operator
Definition
region of chromosome in an operon to which the repressor binds when operon is "turned off"
Term
hox gene
Definition
series of genses that control organs & tissues that develop in various parts of embryo
Term
operon
Definition
group of genes operating together
Term
frameshift mutation
Definition
mutation that shifts the "reading" frame of the genetic message by insertingor deleting a nucleotide
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