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Unit 8 - DNA
Genetics Review
11
Biology
10th Grade
06/04/2013

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Term

Double Helix


 

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Definition
  •  double stranded DNA linked together by hydrogen bonds with both strands oriented  in opposite directions 
Term

DNA Reprication

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Definition
  •  Process in making an identical copy of double stranded DNA, by spliting in halph and creating a complete new copy of DNA itself 
Term

Nitrogenous Base

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Definition
molecule that forms an important part of nucleic acid, composed by a nitrogen-containing ring structure; Hydrogen bonds between bases in opposite complementary strands connect both strands in a double-helix DNA
Term

mRNA

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Definition
Type of RNA that carries the code or chemical blue print for a specific type of protein. mRNA is a synthesize copy of DNA after transcription.
Term

ribosomalRNA

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Definition
nuclaic acid found in all living cells; transfers information from DNA to protein-forming system of the cell
Term

Transcription

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Definition
process of transcribing or making a copy of genetic information stored in a DNA strand into a complementary strand of mRNA with the aid of RNA polymerases
Term

Codon

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Definition
set of three adjacent nucleotides, in mRNAthat base-pair with the corresponding aniticodon of tRNA molecule that carries a particular amino acid, specifying the type and sequence of amino acids for protein synthesis.
Term

Translation

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Definition
step in protein biosynthesis where in the genetic code carried by mRNA is decoded to produce the specific sequence of amino acids in a polypeptide  chain
Term

Mutation

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Definition
permanent, heritable change in nucleotide sequence in a gene or chromosome; the process in which such a change occurs in a gene or in a chromosome. mutation can also be a change in which a species is evolving.
Term

Point Mutation

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Definition
a mutation in DNA or RNA molecule involving a change of only one nucleotide base.
Term

Frameshift Mutation

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Definition
gene mutation where in the addition or deletion of nucleotide(s) causes a shift in the reading of codons in mRNA
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