All of the following contribute to a pathogen's invasiveness EXCEPT
A) toxins.
B) capsules.
C) cell wall components.
D) hyaluronidase.
E) coagulases.
A
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When damaged or single-stranded DNA activates the RecA protein, the RecA protein stimulates the cleavage of LexA. This results in
A) repression of polymerase V and activation of endonuclease. B) activation of the Hfr system. C) derepression of the SOS system. D) increased transduction and recombination.
Nongonococcal urethritis may be caused by the protozoan ________
A) Chlamydia trachomatis B) Neisseria gonorrhoaea C) Haemophilus ducreyi D) Trichomonas vaginalis
Hormones play a role in which of the following plant processes? Select all correct choices
A. branch development B. root development C. fruit ripening D. gravitropism
Vacuoles are _________ in plant cells than in animal cells.
a) smaller b) larger