Which describes a promoter? the first part of an operon that regulates where, when, and to what level a gene is expressed the part of an operon that, if attached by a repressor protein, suppresses the expression of a gene a cluster of genes that are expressed or repressed as a group an enzyme that helps DNA unzip prior to transcription

Which of the following statements regarding anfinsen's denaturing experiments with ribonuclease a (rnase a) are valid? exposing the denatured protein to air oxidation and then dialysis to remove urea restored the protein to its original functionality. removing urea by dialysis and then allowing air oxidation of the denatured protein restored the protein to its original functionality. denaturing the protein with both urea and β-mercaptoethanol yielded an inactive protein. anfinsen concluded that protein folding is determined by its primary sequence.

Which of these correctly describes the difference between processes that take place in prokaryotic and eukaryotic cells?

The pelican's beak is adapted for in .