A central vacuole
(a) is found only in plant cells.
(b) may take up between 50% and 90% of the cell’s interior.
(c) regulates water balance.
(d) is all of the above.
(d) is all of the above.
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Bacteria transformed with plasmids are plated on growth medium containing ampicillin and X-gal. White colonies on
the plate contain bacteria with a ____ plasmid, meaning the lacZ+ gene is ____.
a. recombinant; deleted from the plasmid b. nonrecombinant; intact c. recombinant; intact d. nonrecombinant; disrupted by the inserted DNA fragment e. recombinant; disrupted by the inserted DNA fragment
One way the intensity and extent of a stimulus is registered is by the frequency of action potentials traveling along the
axons of afferent neurons.
Indicate whether the statement is true or false.The species at the top of a food web
A) do not prey on other species and are not subject to predation. B) do not prey on other species and are subject to predation. C) prey on other species and are not subject to predation. D) prey on other species and are subject to predation.
Which vertebrates exhibit a "flow-through" respiratory system?
A. birds and fishes B. amphibians C. birds D. fishes E. mammals