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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Which of the following does not have potentially teratogenic effects?
A) Sunlight B) Alcohol C) Infectious diseases D) X-rays E) Smoking
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