Semen is composed of secretions or cells produced in all of the following structures EXCEPT
A. the prostate gland.
B. seminal vesicles.
C. the testes.
D. bulbourethral glands.
E. vas deferens.
Answer: E
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What occurs in Duchenne muscular dystrophy?
a. muscle fibers break down b. motor neurons stop signaling muscle fibers c. actin filaments do not form d. myosin filaments do not form e. calcium does not leave the endoplasmic reticulum
Consider several human populations of equal size and net reproductive rate, but different in age structure. The population that is likely to grow the most during the next 30 years is the one with the greatest fraction of people in which age range?
A) 50 to 60 years B) 40 to 50 years C) 30 to 40 years D) 20 to 30 years E) 10 to 20 years
A doctor's office has run out of the latest flu vaccine, but many patients are asking for it. One of the nurses finds some vials from last year's batch in a refrigerator. Should they be used?
A. Yes, because the preservatives and refrigeration ensure that the vaccine is still fresh. B. No, because each year the vaccine is made against different subtypes of the flu virus. C. Maybe, the vaccine should be mixed in a test tube with the virus to see if it still inactivates it. D. No, because each year the technology to make a good vaccine improves.
What type of rock preserves fossils well?
A. granite B. metamorphic rock C. igneous rock D. sedimentary rock E. gravel