Spermatogenesis takes place in which of the following structures?
a. seminiferous tubules
b. seminal vesicles
c. prostate gland
d. bulbourethral glands
e. glans
A
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Which microbial grouping is the major oxygenic phototroph in most salt lakes?
A) cyanobacteria B) Dunaliella, a eukaryotic alga C) halophilic Archaea D) purple nonsulfur bacteria
Pathogens spread by
a. direct contact. b. indirect contact. c. inhalation. d. contact with a vector. e. all of these
Which of the following are sugar-transporting cells in angiosperms?
a) parenchyma cells b) tracheids and vessel elements c) sieve-tube elements d) collenchyma cells e) clerenchyma cells
When a person is exercising, CO2 builds up in the blood. What effect would this have on external respiration?
A) There would be increased diffusion of CO2 out of the blood and into the lungs and decreased ventilation to move it out of the body. B) There would be decreased diffusion of CO2 out of the blood and into the lungs and decreased ventilation to move it out of the body. C) There would be decreased diffusion of CO2 out of the blood and into the lungs and increased ventilation to move it out of the body. D) There would be increased diffusion of CO2 out of the blood and into the lungs and increased ventilation to move it out of the body.