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Bio: Unit 4
DNA
Term/Question | Definition/Answer |
---|---|
DNA | Double Stranded, made of subunits called nucleotides. |
What 3 parts do nucleotides have? | 1. sugar 2. Phosphate 3. Nitrogen containing base |
Name the 4 nitrogen containing bases. | 1. adenine 2. guanine 3. cytosine 4. thymine |
Are adenine and guanine purines or pyrimidines? | Purines |
Are cytosine and thymine pyrimidines or purines? | Pyrimidines |
What are purines? | 2 rings of carbon & nitrogen atoms. |
What are pyrimidines? | 1 ring of carbon & nitrogen atoms |
What did Watson & Crick do? | DNA is made of 2 nucleotide chains |
Replication | Copying of DNA |
Mutation | Change in sequence |
RNA | Nucleic acid, single stranded, uracil replaces thymine. |
Sugar= | Ribose |
How many types of RNA are there? | 3 |
Messenger RNA | Carries genetic info from DNA to the nucleus |
Transfer RNA | Binds to specific amino acids |
Ribosomal RNA | Makes up the ribosomes. |
Transcription | Genetic info is copied from DNA to RNA |
Genetic Code | Relationship between nucleotide sequence & amino acid seq. |
Codon | every 3 letters in a mRNA seq. |
Translation | Assembling polypeptides from info encoded in the mRNA |
Where does mNA migrate to? | Ribosomes |
Mutation | Change in DNA |
Chromosomal Mutation | Change in structure |
How many types of chom. mutation are there? | 5 |
Deletion | A piece of a chrom is lost |
Invertion | Chrom. seg. breaks off and reattaches backwards |
Duplication | Seq. is repeated |
Translocation | 2 chrom that aren't homologous |
Nondisjunction | Failure of chrom to separate. |
Gene mutation | mutation of the genes |
Genetic enginering | altering and cloning genes |
DNA extraction | Chemical treatments that cause cells to burst |
Use of restriction enzymes? | Used as "siccors" to cut DNA |
DNA seq | Used to determine order of nucleotides |
Cloning | Genetically identical cells |
Recombninant DNA | DNA from 2 or more sources that is incorporated into a single recombinate molecule |
Transgenics | Genome has been altered by the transfer of a gene. |
Gene therapy | insertion of genes into a persons cells |