2/9/17 lecture: molecular genetics II Flashcards Preview

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Flashcards in 2/9/17 lecture: molecular genetics II Deck (23):
1

gene

sequences of DNA transcribed

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three types of RNA

ribosomal RNA, messenger RNA, transfer RNA

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DNA ends

5' , 3'

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what end can you add to on DNA

3', DNA only grows from one end

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Base parng rules

AT, CG

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transcription

DNA --> RNA

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mRNA

messenger RNA, brings message from DNA in nucelus to ribosomes - ste of protein synthesis, out of nucleus to ribosomes

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eukaryotic gene structure

how genes are arranges is idenitifable

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exon

coding peices of DNA with info

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intron

no info - removed during splicing, single gene can code for multiple proteins, read in different ways

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promoter

switch turning gene on- DNA polymerase starts here, starts it, separates exon/intron

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termination region

end of the message

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UTR stands for

untranslated - not read

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transcription steps

1. promoter seapartes 2 strands of DNA, read bottom line, 2. elongation - copied info, sequence difference, info same 3. termination - copleted RNA transcript 5' -> 3' end product for transfer and ribosomal RNA

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translation

nucleic acid -> amino acid

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tRNA

transfer RNA, transports a particular amino acid to ribosome

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rRNA

ribosomal RNA, comprises ribosomes, has anticodon at bottom

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codon

three nucleotide- triplet- sequence in mRNA that specifies a particular amino acid

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genetic code

all 64 possible triplets and resulting 20 amino acids

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genetic code is ___, not ____

redundant, ambigous

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universal genetic code

written relative to mRNA

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mRNA is read which way

5' to 3' end

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start codon

AUG

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