Which substance is a fossil fuel?
A) vegetable oil
B) coal
C) hydrogen gas
D) wood
B
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Which of the following species of Mycobacterium causes a chronic disease of the skin, mucous membranes, and nerve tissue but has not yet been cultivated in vitro?
a. M. paratuberculosis b. M. lepraemurium c. M. phlei d. M. leprae
Which hormones are made in the ovaries?
a. estrogen and progesterone b. follicle-stimulating hormone c. oxytocin and estrogen d. prolactin e. leutinizing hormone and progesterone
Which of the following is not true of the antigen-independent period of lymphocyte development?
A. Lymphocytes with specificity for self are destroyed. B. Mature lymphocytes populate lymphatic organs and encounter antigens. C. Many lymphocytes with different specificities are formed. D. Random genetic rearrangements occur to produce different surface protein receptors. E. Lymphocytes form from stem cells in the bone marrow.
In many ways, a mule is a superior animal to the horse or donkey. Mules are often stronger and can jump higher than either of their parents. Why, then, are mules considered to be a "weak hybrid"?
A) They are sterile. B) They do not live as long as horses and donkeys. C) Their offspring are progressively weaker than the parents. D) They are more prone to disease than are horses and donkeys.