Which of the following statements regarding trachoma is FALSE?
A) It is the leading cause of nontraumatic blindness in humans.
B) It is most often a disease of adults who suffer from sexually transmitted chlamydia.
C) It leads to corneal scarring.
D) It first infects the conjunctiva and kills cells there.
E) Infants may contract the disease while passing through an infected birth canal.
B
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Mitochondria are transmitted from mothers to ____
a. all of their daughters through the cytoplasm of the egg b. all of their sons through the cytoplasm of the egg c. all of their children through the cytoplasm of the egg d. 50% of their children through the X chromosome e. 50% of daughters through the X chromosome
What is the key concept addressed by the question?
What will be an ideal response?
One major difference between ectomycorrhizae and arbuscular mycorrhizae is
A. ectomycorrhizae are parasitic on plant roots while arbuscular mycorrhizae are not. B. ectomycorrhizae do not penetrate plant roots; arbuscular mycorrhizae penetrate plant roots. C. ectomycorrhizae are more common on plant roots than arbuscular mycorrhizae. D. ectomycorrhizae form mutualisms while arbuscular mycorrhizae are parasitic. E. most ectomycorrhizae are zygomycetes while most endomycorrhizae are basidiomycetes.
Which mechanism allows certain viral pathogens to evade the vertebrate immune system?
A. becoming a symbiont B. becoming nonvirulent C. frequent changing of surface antigens D. becoming metabolically inactive E. becoming a spore