Which structure do turtles lack?
a. carapace
b. jaws
c. teeth
d. plastron
e. keratinized beak
ANSWER: c
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The current cost of sequencing a human genome is
A. about $10 B. about $1,000 C. about $1,000,000 D. over $400,000,000
For given species, the maximum rate of increase per individual under ideal conditions is its _____
a. biotic potential c. environmental resistance b. carrying capacity d. density control
An example of ligand-gated ion channels is _____
A) the spreading of action potentials in the heart B) acetylcholine receptors at the neuromuscular junction C) cAMP-dependent protein kinases D) action potentials on the axon
Lichens are composed of a symbiosis of fungi and which of the following?
A) green algae B) cyanobacteria C) euglenoids D) cyanobacteria or green algae E) euglenoids or dinoflagellates