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10 Cards in this Set
- Front
- Back
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How many strands does an RNA molecule usually consist of?
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One
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Genes provide...
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... the instructions for making specific proteins.
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What is TRANSCRIPTION?
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The synthesis of RNA under the direction of DNA.
- The reulting RNA molecule is a faithful transcript of the gene's protein building instructions. |
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What is TRANSLATION?
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The actual synthesis of the polypeptide, which occurs under the direction of the mRNA.
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Where does translation actually occur?
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On RIBOSOMES.
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Difference between prokaryotes and eukaryotes regarding TRANSCRIPTION and TRANSLATION?
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Essentially the same. However, the important difference is in the glow of genetic information within the cells. B/c bacteria lacks nuclei, their DNA s not segregated from ribosomes and other protein synthesizing equipment.
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What is a TRIPLET CODE?
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The genetic instructions for a polypeptide chain that are writtien iat n the DNA as a series of nonoverlapping, thee nucleotide words.
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What is a BASE TRIPLET called
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A CODON.
Each codon specifies an amino acid to be added to the growing polypeptide chain. |
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What is the transcription rate in a eurkaryotic cell?
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Approx. 60 nucleotides per second
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How does the method of TERMINATION differ between prokaryotes and eukaryotes?
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Prokaryotes: transcription proceeds through a terminator sequence in the DNA.
Eurokayotes: the pre-mRNA is cleaved from the growing RNA chain while RNA polymerase II continues to transcribe DNA. |
