Which of these is best characterized as interference competition?
A. A barnacle living on the tail of a humpback whale.
B. Viruses that infect a rabbit.
C. Rabbits and deer grazing on the same grasses.
D. Rabbits and insects that use rabbit warrens for shelter.
E. A tiger excludes other tigers from its territory.
E. A tiger excludes other tigers from its territory.
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The quick response of the immune system to a second infection is due to the _____, a feature of the immune system as demonstrated by the success of vaccines
a. activation of macrophage cells b. suppression of suppressor cells c. T and B memory cells d. high levels of antigen e. new cytotoxic T cell.
True-breeding individuals are produced by repeated backcrossing
Indicate whether the statement is true or false
Which of the following uses cows as the intermediate host?
A) Enterobius vermicularis B) Taenia asiatica C) Taenia solium D) Necator americanu E) Taenia saginata
Enzymes are necessary for cells because
A) enzymes slow down chemical reactions that would otherwise occur too quickly to facilitate life. B) enzymes allow chemical reactions to occur under physiological conditions. C) enzymes allow chemical reactions to occur under physiological conditions and within a time frame conducive to life. D) enzymes allow chemical reactions to occur quickly enough to facilitate life. E) enzymes allow chemical reactions to take place that would otherwise be impossible.