Molecular Biology Flashcards
Learn about the Central Dogma
What is the difference in thermodynamic stability between wobble base-pair and normal Watson-Crick base pair?
They have similar thermodynamic stabilities
What is genomic imprinting?
When only one allele of a gene is expressed
What observation led to the notion that imprinting is an epigenetic process?
The observation that imprinting can change from generation to generation
In humans, when does X-inactivarion occur?
It occurs in early stage of development at the blastocyst stage
What is the default for repressible anabolic enzymes?
ON
Transcription of these wnzymes are inhibited ain the presence of excess amounts of product
What is the default position for inducible catabolic enzymes
The default is off
This is because catabolic enzymes whose transcriptions are stimulated by the abundance of a substrate
Is the Lac operon inducible or repressible
The Lac operon is inducible because the enzymes that codes for are part of lactose catabolism
Is the trp operon inducible or repressible?
The trp operon is repressible since the enzymes that codes for mediate tryptophan biosynthesis or anabolism
What two components does an operon have?
Operons have a codon sequence for enzymes and Upstream regulatory sequences or control sites
