Select the situation that describes the expression given below. A. Hayne gives of a gallon of juice to each of his friends. Now, he is left with of a gallon of juice. B. Sybil has of a pound of clay. He uses of it to make an art piece. C. Jenny has of a gallon of ice cream. She serves each of her friends of a gallon of ice cream. D. Naomi has of a foot of ribbon. She uses of a foot of the ribbon for decorating a gift box.

Are salt and soap nutrients or toxins for yeast? explain.

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?

One of the newest applications of cell technology is called cybrid embryos. this process involves replacing the nuclear material of an animal cell with human nuclear material. how might this process affect public policies about research by using stem cells? the same policies and concerns about the use of human embryonic stem cells would most likely apply. the embryos would most likely be treated like traditional animal embryos and regulated accordingly. the process of forming cybrid embryos would most likely be banned by government regulators. the embryos would be treated as regular cells because they are not fully human in origin.