Bacteriophages are viruses that infect bacteria. in an experiment, bacteriophages were labeled with either radioactive phosphorus or radioactive sulfur. the labeled bacteriophages were incubated with bacteria for a brief amount of time and then removed. the infected bacteria cells were found to contain significant amounts of radioactive phosphorus but not radioactive sulfur. based on the results of the experiment, which of the following types of molecules did the bacteriophages most likely inject into the bacteria cells? (a) simple carbohydrate (b) amino acid (c) dna (d) polypeptide

(C) DNA

Explanation:

DNA molecules does not contain sulfur in its structure. Some aminoacid (methionine and cysteine) does, therefore, a lot of polypeptides does. Also, some carbohydrates can have sulfur groups linked to its molecules.

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.