Polio is transmitted by ingestion of water contaminated with human feces containing the poliovirus. What would be the preferred portal of entry for the poliovirus?
a. mucous membranes of the respiratory tract
b. mucous membranes of the gastrointestinal tract
c. through the skin
d. parenteral route
Answer: b. mucous membranes of the gastrointestinal tract
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Anammox is an anaerobic process that generates energy from ________ and forms N2
A) ammonia B) ammonium C) ammonia and nitrate D) ammonia and nitrite
What can be inferred from the accompanying graph?
a. This reaction is endergonic, with a positive ?G. b. This reaction is endergonic, with a negative ?G. c. This reaction is exergonic, with a positive ?G. d. This reaction is exergonic, with a negative ?G. e. There is not enough information to make a determination.
Which male reproductive structure is responsible for producing secretions that neutralize residual urine within the urethra before ejaculation?
a. seminal vesicles b. prostate gland c. Cowper’s gland d. epididymis
Which of the following associations of reproductive strategies and their descriptions are correct?
A. viviparous - the embryo develops inside the body of the female from which it gains nourishment B. oviparous - egg is deposited in external environment C. ovoviviparous - produce eggs but retain them inside the female body until hatching occurs D. All of the choices are correct.