Researchers are interested in the genomes of prokaryotic species for all of the following reasons EXCEPT
A. bacteria cause many diseases that affect people, plants, and animals.
B. bacteria reveal modes of infection.
C. bacteria are more complex than humans.
D. the origin of the first eukaryotic cell probably involved a union between an archaeal and a bacterial cell.
E. All of the choices are reasons for studying genomes of prokaryotic species.
C. bacteria are more complex than humans.
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A neuraminidase inhibitor called ________ is sometimes used in the treatment of people infected with influenza viruses.
Fill in the blank(s) with the appropriate word(s).
The mechanism of phase variation in Salmonella typhimurium:
A. uses site-specific recombination to invert the fljA and fljB genes so they now are not contiguous with their promoter. Expression of these genes is now prevented. B. uses site-specific recombination to invert the fljA and fljB promoter, preventing transcription of the two genes. Without repressor the fljC protein is now expressed. C. uses site-specific recombination to delete the repressor, fljA. Without repressor the fljC protein is now expressed. D. uses site-specific recombination to delete the fljB gene so only fljC can be expressed. E. None of the choices given is true.
Outside the CNS, groups of neuronal cell bodies that are clustered together to perform basic functions are known as
A. spinal cords. B. somata. C. nerves. D. nerve nets. E. ganglia.
Alpha helices and beta sheets are characteristic of protein
A) primary structure. B) secondary structure. C) tertiary structure. D) quaternary structure. E) enzymatic structure.