The filtering device at the top of each nephron is called a
A. loop of Henle.
B. ureter.
C. glomerulus.
D. Bowman's capsule.
Answer: D
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Which of the following lead(s) to genetic variation in sexually reproducing organisms?
a. the process of meiosis b. the combination of male and female gametes during fertilization c. mutations that occur during development d. the process of meiosis and the combination of male and female gametes during fertilization
Why is blood pressure low in fish? a. Blood must flow through sinus venosus
b. Water enters slightly deoxygenated. c. Fish are not susceptible to hypertension conditions. d. Blood does not return back to the heart.
The most common form of muscular dystrophy in adults is
a. myotonic. b. fascioscapulohumeral. c. Becker. d. myoclonic. e. Duchenne.
Which of the following likely reflects the presence of one or more gene mutations?
A. The bacteria that cause gonorrhea, a common sexually transmitted disease, have previously been killed by penicillin; however, after continuous usage of the antibiotic, penicillin-resistant strains are now becoming prevalent. B. Radiation causes an alteration in a DNA nucleotide sequence, which is discovered when mapped, but which appears to be neither increasing nor decreasing in successive generations. C. Fruit flies subjected to intense radiation produce a wider array of variable offspring. D. A chemical leaking from the surface of an old abandoned coal mine alters a regulatory gene so that a cricket nymph develops an extra set of eyes. E. All of the choices are correct.