Eastern and Western meadowlarks look almost identical and sometimes inhabit the same areas of prairies. These birds recognize members of their own species by distinctive songs and thus do not breed with each other. This is an example of
A) temporal isolation.
B) ecological isolation.
C) behavioral isolation.
D) mechanical isolation.
E) geographic isolation.
C
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In an experiment involving planar bilayers, a solution of table salt (sodium and chloride ions in water) is added on the left side of the membrane while pure water is added on the right side. After 30 minutes the researchers
test for the presence of ions on each side of the membrane. The right side tests negative for ions. What can you conclude? A) The experiment failed. B) The water somehow blocked the movement of ions across the membrane. C) The left side would probably also test negative for ions. D) Ions cannot cross planar bilayers.
The pilomotor response causes
a. your hair to "stand on end." b. your muscles to shiver. c. hunger. d. thirst. e. an increase in heart rate.
Ingesting lactic acid bacteria to prevent colonization by intestinal pathogens such as Salmonella enterica during antibiotic therapy is an example of ________.
A) chemotherapy B) vaccination C) probiotics D) parasitism E) opportunism
The allele at locus B is likely to be lethal when combined with the allele for barred eyes.
a. true b. false