Study Guide to Exam II

 

Vocabulary

Supercoiling DNA gyrase Topoisomerase Nuclear matrix proteins
Semiconservative Replication fork Okazaki fragment Helicase
Primase Nick translation Ligase DNA polymerase I
Transcription start site Sense strand Template strand Promoter
Shine-Dalgarno Aminoacyl tRNA synthetases Peptidyl transferase Kozak sequence
Wobble Release factors Charged tRNA Polycistronic
diauxie repressor inducer gratuitous inducer
operator PaJaMo trans-acting/cis-dominant Co-repressor
lac promoter cAMP-CRP Constitutive Attenuation
       
       

Questions and problems

How do the Shine-Dalgarno sequence and the 30S ribosome function coordinately in translation?

What is an open reading frame?

Distinguish between positive and negative modes of transcriptional regulation. How is it that negative regulation can be associated with "induction", while positive regulatory mechanisms can account for "repression"?

What evidence led to the proposal of the operon model by Jacob and Monod?