How many distinct aminoacyl-tRNA synthetases does each cell make?
A. ~1
B. ~20
C. ~60
D. ~120
E. ~180
B. ~20
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The tracheae of adult terrestrial insects have been a factor in the great abundance of insects because they serve the same function in terms of the delivery of respiratory gases to the cells as do
A. the gills of aquatic insects. B. the lungs of mammals. C. the book lungs of spiders. D. the closed circulatory system of cephalopods. E. the Malpighian tubules of spiders.
Cereal crops such as rice and corn are_______________
a. monocots c. seed plants b. vascular plants d. all of the above
The term that describes cumulative genetic changes that give rise to new species is ____
a. microevolution b. macroevolution c. gene pooling d. genetic drift e. group divergence
_____________________ can be defined as compulsive and repetitive behavior which can lead to impairment. Fill in the blank(s) with the appropriate word(s)