Cells express a limited number of genes at a time. This can result in the specialization of cells within organisms. This understanding best supports which of the following statements? a
The expression of genes is a result of random chance
b
Only multicellular organisms have useful, unexpressed genes
c
Certain genes cannot be expressed by eukaryotic cells
d
The process of expressing genes is controlled by the cell

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?

What maintain homeostasis when a persons internal body temperature is 97.5°f

The pressurized plants and fungi mentioned in the video have some surprising similarities. what differences would you expect them to have?