The blob operon produces enzymes that convert compound A into compound B. The operon is controlled by regulatory gene S. Normally, the enzymes encoded by the operon are synthesized only in the absence of compound B. If gene S is mutated, the enzymes are synthesized in the both the presence AND absence of compound B. Gene S must encode a(n):
a. inducer.
Answer:
Contact inhibition is a process of arresting cell growth when cells come in contact with each other. As a result, normal cells stop proliferating when they form a monolayer in a culture dish. Contact inhibition is a powerful anticancer mechanism that is lost in cancer cells (16).
Explanation:
D. The pathogen had been weakened
In biology, a relationship between individuals of two species in which one species obtains food or other benefits from the other without either harming or benefiting the latter.
The arctic environment is deathly cold, hence the thick blubber on animals so they can handle freezing temperatures