The chelicerates (select all that apply)
A. include spiders, scorpions, and their
relatives.
B. are known for their venoms.
C. were among the first animals to invade
land around 400 million years ago.
D. have pincer-like claws, antennae, and
wings.
E. are ecologically diverse, particularly in
their food habits, with different groups
specializing on a wide variety of plant and
animal foods.
A,B,C
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Which of the regions of the ribosome accepts charged tRNA molecules during the elongation phase of
translation?
a. the A site (aminoacyl site) b. first the A site (aminoacyl site) and then the E site (exit site) c. the P site (peptidyl site) d. first the A site (aminoacyl site) and then the P site (peptidyl site) e. the E site (exit site)
As altitude increases
a. PO2 increases b. PO2 decreases c. PCO2 increases d. PCO2 decreases e. PN2 increases
The light that passes through the pupil is focused by the lens on the
A. iris. B. sclera. C. choroids. D. retina. E. lens.
In the 1930s, the Navajo Nation treated sheep and cattle for ticks and other parasites by using concrete "dip tanks." Animals were herded through one end of the tank and out the other. Each day, the tanks were filled with 200,000 gallons of insecticide and any remaining chemicals were emptied onto the ground. The pesticide solution seeped into the ground, ditches, and pits around the tanks. This was a common practice in the United States during that period.