The polymerization of pure G-actin in vitro proceeds in three phases.

Column I	Column II
A. nucleation phase	i. G-actin monomers exchange with subunits at the filament ends, but there is no net change in the total length of filaments
B. elongation phase	ii. marked by a lag period in which G-actin subunits combine into an oligomer of two or three subunits
C. steady-state phase	iii. the short oligomer rapidly increases in length by the addition of actin monomers to both of its ends

Which of the following represent correct match?

#Question id: 4338

#Unit 3. Fundamental Processes

Altering patterns of gene expression in prokaryotes would most likely serve an organism's survival by __.

#Question id: 4339

#Unit 3. Fundamental Processes

In positive control of several sugar metabolism-related operons, the cAMP receptor protein (CRP) binds to DNA to stimulate transcription. Which of the following environmental conditions causes an increase in CRP activity in stimulating transcription?

#Question id: 4340

#Unit 3. Fundamental Processes

There is a mutation that is found in E. coli in the repressor that results in a molecule known as a super-repressor because it represses the lac operon permanently. Which of the following characteristics would you expect to observe in such a mutant?

#Question id: 4341

#Unit 3. Fundamental Processes

Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences within a prokaryotic genome. If a researcher moves the promoter for the lac operon to the region between the beta galactosidase (lacZ) gene and the permease (lacY) gene, which of the following results would be most likely?

#Question id: 4342

#Unit 3. Fundamental Processes

Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences within a prokaryotic genome. If a researcher moves the operator to the far end of the operon, past the transacetylase (lacA) gene, which of the following processes would likely occur when the cell is exposed to lactose?

#Question id: 4343

#Unit 3. Fundamental Processes

Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences within a prokaryotic genome. If a researcher moves the repressor gene (lacI), along with its promoter, to a position at some several thousand base pairs away from its normal position, which of the following results would be expected?