Keeping in mind the life cycle of bacteriophages discussed earlier in the text (see Chapter 6), 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?

Video transcript

Hello everyone here, we have a question that says, enzymes that are produced only one specific chemical substrates are present are called blank enzymes. Meanwhile, enzymes that are produced continuously regardless of any environmental changes are referred to as blank enzymes induce a ble. As the name suggests, are enzymes that are produced when a specific chemical substrate is present. And an example of this is the lactose metabolism enzyme. Meanwhile, enzymes that are produced continuously regardless of any environmental changes are referred to as constitutive enzymes. So our answer here is a induce a ble constitutive. Thank you for watching. Bye!