What is the difference between an operator and a promoter?
What will be an ideal response?
Answer: A promoter sequence is found upstream of all genes and is the site where RNA polymerase binds for transcription to begin. An operator is again a nucleotide sequence but is found only in operons and regulons. The operator region, depending on a cell's regulatory mechanisms, is where an activator and repressor bind to either turn on or off transcription.
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Which physical feature makes it possible for amniotes to be completely terrestrial?
a. their skin b. their lungs c. their eggs d. their four limbs e. their brains
Low density lipoproteins
a. carry cholesterol to the liver. b. line the artery walls. c. are used for nutrition. d. lower blood pressure. e. carry cholesterol and other fats to body cells.
Rheumatic fever is a sequalae of repeated infection with Streptococcus pyogenes. The pathogenesis involved in this complication is molecular mimicry of the valves of the heart
a. true b. false
You are setting up a PCR reaction and add a primer for one end of the target sequence, but you forget to add the primer for the other end of the target sequence. If you added the other necessary components, what do you expect to observe after running the
PCR reaction for 40 cycles? A) The PCR reaction will produce billions of copies of the target DNA. B) The PCR reaction will produce millions of copies of the target DNA. C) The PCR reaction will produce one copy of the target DNA. D) The PCR reaction will produce zero copies of the target DNA.