How do promoters differ in efficiency how is the expression

Question

1. How do promoters differ in efficiency
2. How is the expression of the lac operon inhibited by the lac repressor?
3. Which two characteristics differentiate promoters from enhancers?
4. Name the 3 different eukaryotic RNA polymerases and describe the specific genes they transcribe.
5. What role do small nucleolar ribonucleoproteins (snoRNPs) play in RNA processing?
6. What is the amino acid error rate in protein synthesis? Is this rate logical in evolutionary terms of function?
7. What is the first step in the elongation cycle of protein synthesis?
8. Translation can be considered to have three phases or steps: initiation, protein synthesis, and termination. Please give a detailed summary of the factors and molecules involved with each step and, where appropriate, compare/contrast the differences between prokaryotic and eukaryotic translation.