Sequences for the types of hemoglobin are shown. CCT GAG GAG
Sequence for wild-type hemoglobin
CCT GTG GAG
Sequence for sickle-cell hemoglobin
Sickle-cell anemia is caused by a mutation of one nucleotide in a gene. The type of mutation that causes sickle-cell anemia is known as
A) a frame-shift mutation
B) an insertion mutation
С) an inversion mutation.
D) a point mutation

Keeping in mind the life cycle of bacteriophages, consider the following problem: during the reproductive cycle of a temperate bacteriophage, the viral dna inserts into the bacterial chromosome where the resultant prophage behaves much like a trojan horse. it can remain quiescent, or it can become lytic and initiate a burst of progeny viruses. several operons maintain the prophage state by interacting with a repressor that keeps the lytic cycle in check. insults (ultraviolet light, for example) to the bacterial cell lead to a partial breakdown of the repressor, which in turn causes the production of enzymes involved in the lytic cycle. as stated in this simple form, would you consider this system of regulation to be operating under positive or negative control?

How is transcription similar to translation in terms of base pairing?

Several billion years ago which gas was the least prevailant in the atmosphere