How does the lactose repressor block transcription of the lactose operon?
a. by "turning off" the appropriate genes in the intron
b. by regulating the activity of the enzymes that the operon codes for
c. by binding allosterically to the appropriate genes
d. by slowing the uptake of lactose into the cell
e. by binding to the operator
E
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E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more generations (two rounds of DNA replication). DNA extracted from these cells is centrifuged
What density distribution of DNA would you expect in this experiment? A) one high-density and one low-density band B) one intermediate-density band C) one high-density and one intermediate-density band D) one low-density and one intermediate-density band E) one low-density band
Compare and contrast the prokaryotic and eukaryotic light-gathering machinery function and spatial organization. Why do various chlorophylls show different absorption spectra?
What will be an ideal response?
Genetic elements in bacteria form _______________
a. the nucleoid b. plasmids c. the nucleus d. both the nucleoid and plasmids
Phospholipids have both a hydrophilic and a hydrophobic region
a. true b. false