Biologists captured and marked 100 butterflies, and later captured 115, 5 of which were marked. The
population estimate is 2000 butterflies.
Indicate whether the statement is true or false.
ANS: F, 2,300
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Food-borne pathogens are most commonly identified by
A. standard culture techniques. B. polymerase chain reaction (PCR). C. pulsed-field gel electrophoresis. D. None of the choices are correct.
In the accompanying diagram, F represents the ____
a. stomach b. liver c. pancreas d. gallbladder e. small intestine
Which one of the following is false concerning intraspecific hybrids?
A. An intraspecific hybrid is the offspring of two separate genetic lines. B. Intraspecific hybrids result from asexual reproduction. C. Selective breeding produces intraspecific hybrids for improved agricultural yields. D. An intraspecific hybrid can contain desirable characteristics from two different strains.
Marine bony fish __________ water by osmosis, while freshwater bony fish __________ water by osmosis.
Fill in the blank(s) with the appropriate word(s).