#Question id: 4011
#Unit 3. Fundamental Processes
Using both the enzyme reverse transcriptase and radiolabeled deoxynucleotides, you make a radioactive DNA copy from an mRNA. When you hybridize that copy DNA to nuclear DNA, you find that there are seven different chromosomal positions where hybridization occurs, and there are three unhybridized loops at each of the seven positions. From this you conclude:
#Question id: 4012
#Unit 3. Fundamental Processes
Why is the methylguanosine cap added to mRNA before the poly(A) tail?
#Question id: 4013
#Unit 3. Fundamental Processes
The textbook states that the nucleotide sequence of splice sites is “highly conserved” and of “ancient origin.” How do we know this sequence is ancient?
#Question id: 4014
#Unit 3. Fundamental Processes
Operator constitutive mutants of the lac operon would
#Question id: 4015
#Unit 3. Fundamental Processes
When polymerase bind to promoter, it spontaneously undergoes a transition to the open complex and initiates transcription. This gives a low level of constitutive expression called the basal level. The rate -limiting step in basal level transcription
#Question id: 4016
#Unit 3. Fundamental Processes
Activators that stimulate this kind of promoter work by triggering a conformational change in either RNA polymerase or DNA; that is, they interact with the stable closed complex and induce a conformational change that causes transition to the open complex. This mechanism is an example of