Recently the focus of research in behavioral ecology has been on the contribution by behavior to an animal's reproductive success. What is this called?
A. average number of mates
B. fitness
C. foraging efficiency
D. longevity
E. rate of growth to sexual maturity
B. fitness
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Cancer is usually due to:
A. exposure to chemicals or radiation. B. mutations in stem cells. C. a series of mutations that occur throughout an affected tissue or organ. D. a series of mutations that occur in a single lineage of somatic cells. E. a series of mutations that occur in multiple lineages of germ cells.
Why can table salt (NaCl) dissolve easily in water?
a. Water can add electrons to the sodium ion. b. Water can form covalent linkages with salt molecules. c. Water can remove electrons from the chloride ion, which causes the latter to dissociate from the sodium and dissolve. d. Water is polar and salt is nonpolar. Nonpolar compounds are more soluble in polar solvents because they are able to form strong covalent bonds that result in a breaking up of the molecule being dissolved. e. The partial positive charge of the hydrogens in the water molecule can associate with the negative charge of the chloride ion, and the partial negative charge of the oxygen of the water molecule can associate with the positive charge of the sodium atom.
What would the result be if histamine and nitric oxide were NOT secreted during a puncture injury?
A. The blood vessels would be more permeable. B. The blood vessels would dilate. C. Healing would not take place at all. D. The blood mast cells would constrict. E. Healing would be slower.
Used for the demonstration of mycobacteria:
a) PAS b) Wartin-Starry c) both d) neither