Exotoxins differ from endotoxins in that exotoxins
A) are composed of lipopolysaccharides.
B) are stable at 60°C.
C) cannot be converted to toxoids.
D) are secreted from living cells.
Ans: D) are secreted from living cells.
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A database is defined as
A. A large collection of files stored in one place B. A small collection of files that are stored in different places C. Files that are only used by the BLAST program D. A large collection of files that are not annotated.
The bacterium Alcaligenes eutrophus naturally produces polyhydroxybutyrate (PHB), a biodegradable thermoplastic. In 1992, Poirier, et al., reported in the journal Science that the two genes responsible for the production of PHB in bacteria had been introduced into the plant Arabidopsis thaliana, and it was demonstrated that the plants produced PHB. What type of vector was likely used to introduce the bacterial genes into the A. thaliana?
A. BAC. B. YAC. C. Ti plasmid. D. viral vector. E. BAC or YAC.
The incorporation of mineral nutrients into an organic form is called ________
Fill in the blank(s) with correct word
Intermediate hosts become infested with tapeworms through ingestion of
A) cysticerci. B) gravid proglottids. C) tapeworm eggs. D) mature tapeworms. E) tapeworm larvae.