Which of the following produces pili that are subject to both phase and antigenic variation?
A. Chlamydia trachomatis
B. Neisseria gonorrhoeae
C. Escherichia coli
D. Candida albicans
Ans: B. Neisseria gonorrhoeae
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Which of the following represents the proper order of events in embryonic development?
A. fertilization, gastrulation, neurulation, cleavage, organogenesis B. fertilization, cleavage, gastrulation, organogenesis, neurulation C. fertilization, cleavage, gastrulation, neurulation, organogenesis D. fertilization, gastrulation, cleavage, neurulation, organogenesis E. fertilization, gastrulation, cleavage, organogenesis, neurulation
Archaea have multiple types of RNA polymerase
Indicate whether the statement is true or false.
Lipid A is a component of
A) lipopolysaccharides. B) plant cell walls. C) cytoplasmic membranes. D) mycolic acid. E) bacterial glycocalyces.
Petals
A. produce pollen. B. enclose and protect the ovule. C. protect the developing flower. D. attract pollinators. E. are part of the gametophyte.