Chapter 17 Flashcards
Synthesis of RNA using information in the DNA
Transcription
DNA direct the synthesis of proteins
Gene expression
Synthesis of a polypeptide using the information and mRNA
Translation
The central dogma of molecular genetics
DNS, RNA, protein
Coding strand to make an M RNA transcript
Template strand
What is the start codon
AUG
Triplet grouping of ribonucleotide used by the translation machinery during polypeptide synthesis
Reading frame
The enzyme that uses the DNA template strand to transcribe a new M RNA strand
RNA polymerase
Stretch of DNA transcribed in an RNA molecules
Transcription unit
Nucleotide sequence containing TATA
TATA box
What makes up a transcription initiation complex
Transcription factors, RNA polymerase bound to a promoter
What are the three important functions of the 5’ cap and poly-A tail?
Facilitate the export of mature mRNA from the nucleus, help protect mRNA from degradation by hydrologic enzymes, help ribosomes attached to 5’ end of mRNA
Non-coding segments of nucleic acid
Introns
Coding DNA segments
Exons
Small nucleoproteins made up of RNA and protein molecules
snRNP
Interact with certain sites along the intron, releasing it and it rapidly degrades, joining 2 exons that flanked the intron
Spliceosomes
RNA molecule that functions as an enzyme
Ribozymes
Carries genetic material to protein synthesis site
mRNA
Carries amino acids to growing polypeptide
tRNA