Two populations that inhabit the same area but remain genetically distinct can best be called
A. sympatric species.
B. allopatric species.
C. subspecies (races).
D. polymorphic.
E. species.
Answer: E
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The laboratory receives a bloody, tissue contaminated surgical forceps. Upon removal the laboratory should dispose of the instrument by:
a. placing in the biohazard container. b. placing in a sharps container. c. sending back to surgery for disposal. d. ensuring proper return to surgery for chemical sterilization.
Each of the following are true of enzymes except
A. their action may involve minerals. B. they can be used over and over. C. they may or may not require cofactors. D. they increase the activation energy of a reaction. E. their active site is specific to the substrate.
Lymphocytes
A. gain tolerance to self by destruction of lymphocytes that could react against self. B. have membrane receptors that recognize foreign antigens. C. possess MHC antigens for recognizing self. D. develop into clones of B and T cells with extreme variations of specificity. E. All of the choices are correct.
Type II survivorship curves
a. are characteristic of humans and elephants. b. indicate a fairly constant rate of death at all ages. c. indicate a high mortality rate in the very young. d. are characteristic of species in which most individuals live a relatively long life and die of old age. e. are typical of species with high biotic potentials