Species interactions between members of a community include __________ and __________, in
which one species benefits at the expense of another. Fill in the blank(s) with the appropriate word(s).
parasitism; predation
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Horizontal gene transfer between individuals in a population, while not a mutation, is a source of genetic variation
Indicate whether the statement is true or false
Reciprocal innervation of reflexes between antagonistic muscle pairs
a. is the usual basis of coordinated contractions. b. is the means by which rods prevent cones from being stimulated. c. refers to the lens adjustments that bring about precise focusing onto the retina. d. explains the mechanism for the operation of the calcium pump. e. is a protective function only.
Temperature changes can affect the ability of water to dissolve and keep materials in solution. Which statement below is an appropriate hypothesis concerning water temperature and dissolved oxygen?
A) Lower water temperatures allow for lower concentrations of dissolved oxygen. B) Higher water temperatures allow for higher concentrations of dissolved oxygen. C) Lower water temperatures allow for higher concentrations of dissolved oxygen. D) Water temperatures do not affect the concentration of dissolved oxygen.
Each of the following statements concerning bacterial spores is correct EXCEPT:
A. They are formed by Gram-positive rods B. Their survival ability is based on their enhanced metabolic activity C. They can be killed by being heated to 121 C for 15 min D. They contain much less water than bacterial cells