An autosomal recessive disorder
a. requires that only one parent be a carrier.
b. displays its symptoms in heterozygotes.
c. is more frequent in males than females.
d. requires that both parents are carriers.
e. only affects females.
D
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Approximately _____ percent of the Earth’s water is salt water
a. 3 b. 50 c. 65 d. 98
Radiometric dating
a. is based on the premise that each isotope decays at a constant rate. b. is unpredictable because changes in temperature and pressure alter the results. c. can be used to date sedimentary rock. d. has a large error factor. e. is used for dating only recent fossils.
When a person has a liver ailment, bile pigments may leak into the blood causing ______.
Fill in the blank(s) with the appropriate word(s).
An agricultural worker experiences difficulty breathing which becomes progressively worse. Tests show inflammation and damage of the lung tissue, but IgE antibodies and granulocytes are in the normal ranges. With which disorder of the immune system are
these signs and symptoms consistent? A) allergic reaction B) type III (immune complex-mediated) hypersensitivity C) type IV (delayed) hypersensitivity D) autoimmunity E) acquired immunodeficiency