Which of the following best describes fertilization in the fern life cycle?
a. Pollen is blown by the wind to a female cone, where it forms a pollen tube that grows
toward where the egg will form.
b. Flagellated sperm swim in a film of water on the surface of the plant to reach an egg.
c. Flagellated sperm are blown by the wind to a location near an egg, and then swim through
plant fluids to reach the egg.
d. Flagellated sperm swim through plant fluids to reach an egg.
e. Flagellated sperm attach to the moist skin of certain animals and are transferred to the
surface of the plant to reach an egg.
B
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The condition in the host that results from pathogenic parasitic organism growing and multiplying within or on the host is called
A. an infection. B. pathogenesis. C. an infectious disease. D. All of the choices are correct.
Chloraphenicol is an important antimicrobial agen for the treatment of meningitis. Unfortunately chloraphenicol exhiits significant complications which limit its clinical usefulness. These effects include
A. kidney failure B. photo-sensitivity C. bone and tooth damage which can result inaplastic anemia D. liver failure
Antibiotics bind to RNA polymerase and
A) act as base analogs B) inhibit cell wall synthesis C) disrupt cell membrane function D) inhibit transcription
The excess fluid from the cardiovascular system that enters the lymphatic system is called ________.
A. plasma B. blood C. urine D. lymph E. tissue fluid