Xeroderma pigmentosum (XP) is a rare autosomal recessive disorder. Patients with XP exhibit a cellular hypersensitivity to ultraviolet (UV) radiation, a high incidence of skin cancer, and premature aging. Based on these clinical characteristics, what is the most likely cause for this disease?
A. lack of telomerase activity
B. defects in DNA repair
C. shortened telomeres
D. defects in DNA replication
Answer: B
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_______ influence the physical appearance of an organism
A. Morphological traits B. Physiological traits C. Behavioral traits
Four of the five answers listed below are white blood cells. Select the exception
a. neutrophil b. erythrocyte c. lymphocytes d. monocyte e. basophil
Which of the following would not be a "control" in an experimental procedure?
A. a normal group B. an experimental group C. a known standard of comparison D. a placebo group E. a "zero-value" group
The function of the epiglottis is to
A) keep the bronchi from collapsing. B) produce surfactant. C) assist the vocal cords in sound production. D) facilitate gas exchange in the lungs. E) prevent food from entering the larynx.