The fact that humans usually cannot contract a monkey pneumonia is explained by the theory of _____.
A) mechanical barriers
B) enzyme action
C) interferon
D) species resistance
Ans: D) species resistance
Species resistance occurs when an agent will not cause infection in an animal which is not genetically similar to another animal who has the infection.
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Neglecting the effect of air resistance, which of the following is/are true regarding the horizontal component of projectile velocity?
A. remains constant throughout flight B. changes according to gravitational acceleration C. equal to 0 D. both A and B
Which type of bone tissue is considered dense bone?
A. Spongy bone B. Compact bone C. Both "spongy bone" and "compact bone" are correct.
Which cell has a very small, darkly staining nucleus?
a. Erythrocyte b. Normoblast c. Polychromatophilic erythroblast d. Proerythroblast e. Reticulocyte
Which of the following does not have potentially teratogenic effects?
A) Sunlight B) Alcohol C) Infectious diseases D) X-rays E) Smoking