Where are sperm produced?
a. in the seminiferous tubules
b. in the prostate gland
c. in the penis
d. in the epididymis
Ans: a. in the seminiferous tubules
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Diseases such as scrapie in sheep, "mad cow" disease in cattle, and Creutzfeldt-Jakob disease in humans are known as
A. viroids. B. viruses. C. retroviruses. D. TSEs (transmissible spongiform encephalopathies). E. emerging viruses, for example Ebola.
According to the life table, the average age of maturity for this population is
A) age 0. B) age 1. C) age 3. D) age 4. E) ages 3-5
A breeder of cattle has a herd of white cows and a roan bull. Hair color in this breed is controlled by an incompletely dominant gene. The two homozygous forms are either red or white, and the heterozygous is roan. What colors of calves are expected and in what proportions?
A. All white B. All red C. 1/2 white, 1/2 roan D. 1 white, 2 roan, 1 red E. 1/2 white, 1/2 red
Babies born before _____ after fertilization are considered premature.
A. 36 weeks B. 37 weeks C. 38 weeks D. 39 weeks E. 40 weeks