50 points please help, will give brainliest Fill in the blanks in the following paragraph:
The lac operon genes are a series of 3 genes used to create enzymes to digest the sugar . When lactose is NOT present a protein is attached to the promotor site, preventing from binding to the promotor site, and transcribing the DNA. This protein is also needs factors, which are a group of proteins which regulate transcription of genes. When lactose IS present, the protein falls off and binds to the promotor, initiating 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.

What role do traits play in affecting an organisms ability to reproduce? finches

Compare the shapes of the bones of the human skull with the shapes of the bones of the human leg. how do the shapes differ? why are the shapes important?