Gene Transcription & RNA modification 2 Flashcards
Gene
A segment of DNA that is used to make a functional product either RNA molecules (rare) or proteins (common)
Transcription
Process of synthesizing RNA from a DNA sequence
Structural genes
Encode the amino acid sequence of a polypeptide
When a _________ is transcribed the product it makes is mRNA (messenger RNA)
Structural genes
Translation
The sequence of nucleotides within mRNA determines the sequence of amino acid in a polypeptide to make proteins & those proteins determine our traits & phenotype
__________ states the usual flow of genetic material information is from DNA to mRNA to proteins
Central dogma
Gene expression
Overall process to turn a gene on to produce a functional product such as proteins
_________ genes goes through transcription & translation
Structural genes
__________ require base sequences that perform functional roles
Gene expression
What are the different sequences in DNA?
- Regulatory sequence
- Promoter
- Terminator
- Coding region
Regulatory sequence
Site for the binding of regulatory proteins, the role of regulatory proteins is to influence the rate of transcription
Promoter
Site for RNA polymerase signals the beginning of transcription
Terminator
Signals the end of transcription
What are the different sequences in mRNA?
- Ribosome bind site
- Start codon
- Codons
- Stop codon
Ribosome binding site
Site for ribosome binding, translation begins near this site
Start codon
Is ATG & it specifies the 1st amino acid in a polypeptide sequence
What is the 1st amino acid produced in bacteria?
Formylmethionine
What is the 1st amino acid produce in eukaryotes?
Methionine
Codons
3 - nucleotides sequences within the mRNA that specifies a particular amino acid
Stop codon
Specifies the end of polypeptide synthesis