The source of polyvinylchloride as a chemical pollutant is ________
A) wood preservative
B) petroleum products
C) pulp and paper bleaching
D) rubber compounds
E) plastic manufacturing
E
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_____ was the first hominin to leave Africa and did so around _____ million years ago
A. Homo ergaster (H. erectus); 2 B. Ardipithecus ramidus; 4 C. Australopithecus afarensis; 3.2 D. H. neanderthalensis; 0.6 E. H. habilis; 1.7
The least oxygenated blood is indicated by the letter ____
a. A b. B c. C d. D e. E
Free nerve endings in the skin detect ____
a. steady touch b. steady pressure c. vibrations d. movements of individual hairs e. deep pressure
Adaptive immunity is sometimes also called acquired immunity. Which of the following statements provides a basis for the alternative name?
A. Lymphocytes of the adaptive immune system are highly specific for a single epitope. B. Activated lymphocytes produce daughter cells that are identical in specificity and function. C. To become activated, lymphocytes require exposure to the epitope for which they are specific. D. Activated lymphocytes may persist for years in the body. E. Lymphocytes reactive to normal body components are removed.