Which endocrine gland is the main center for control of the internal environment?
a. pineal
b. hypothalamus
c. thyroid
d. adrenal cortex
e. thalamus
ANSWER: b
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HIV adversely affects
A. red blood cells. B. nerve cells. C. macrophages. D. T helper cells. E. macrophages AND T helper cells.
The most common infectious agent acquired from the bite wounds of a number of kinds of animals is
A. Escherichia coli. B. Pasteurella multocida. C. Actinomyces israelii. D. Pseudomonas aeruginosa.
Radioisotopes are used in all of the following scientific applications except:a
dating fossils. b. determining the sequence of genetic information in DNA. c. localization of a drug, such as marijuana. d. the treatment of cancer. e. measuring the pH of the blood
Jacobsen syndrome, which can cause heart defects, intellectual deficiencies, and bleeding disorders, is caused by a deletion of the terminal end of chromosome 11. What method could you use to determine whether an individual has Jacobsen syndrome?
A) Look at a person's skin cells in G1 under a light microscope. B) Perform a karyotype using a person's white blood cells. C) Place a person's red blood cells in culture to see if they grow. D) Count the number of chromosomes present.