In 1935, the cane toad was introduced to Australia to control insect pests. Its population has since grown to 2 million,
mostly due to ____.
a. herbivory of sugar cane
b. the absence of competing species or natural predators
c. its mutually beneficial relationship with some native species
d. parasitism of sugar cane
e. it only occupies a small niche environment
ANSWER: c
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Inducible genes are usually actively transcribed when:a
the molecule degraded by the enzyme(s) is present in the cell. b. repressor molecules bind to the promoter. c. lactose is absent from the cell. d. quantities of precursor materials are low. e. there is no other substrate that can be used by the cell.
Which of the following statements about the neocortex is false?
a. specialized cerebral cortex b. association area c. extensive in mammals d. found to some extent in all vertebrates e. responsible for higher learning
Stanley Miller's experiments were significant because he demonstrated that _____.
A. the behavior of any molecule containing a carbon atom was fundamentally the same B. under certain circumstances the theory of vitalism was valid C. a variety of simple organic compounds could be spontaneously synthesized from components in Earth's primitive atmosphere D. lightning discharges could produce the molecules previously presumed to have originated in volcanic outgassings E. urea could be synthesized from entirely naturally occurring salts
All archaebacteria are:
a. multicellular, prokaryotes b. unicellular, prokaryotes c. multicellular, eukaroyotes d. unicellular, eukaryotes