Lecture 19

Question 1

how are prokaryotic genomes organized?

Answer 1

circular double stranded
nearly all DNA codes for RNA or proteins
transcription and translation regulated precisely

Question 2

what is an operon in bacteria? what does it include?

Answer 2

functional complex of genes for enzymes and metabolism pathways

includes: Structural genes, promoter RNA sites, operator sites, repressor sites, regulartory genes

Question 3

What is the Trp Operon in bacertia?

Answer 3

repressible operon
absence of tryptophan -> transcribes genes of operon

Question 4

What is the Trp Operon in bacertia?

Answer 4

repressible operon
absence of tryptophan -> transcribes genes of operon

Question 5

What is the Lac operon in bacteria?

Answer 5

inducible operon
Lactose binds to site, preventing transcription from being halted

Question 6

What are the 4 levels of gene regulation in Eukaryotes?

Answer 6

Transcriptional, Processing, translational, post-translational

Question 7

What is differential transcription in eukaryotes? what are 3 instances where this occurs?

Answer 7

mechanism that determines which proteins are made

occurs in: cells at different development stages
cells in different tissues
response to different stimuli