Malpighian tubules in land-dwelling arthropods excrete ________
a. uric acid paste
b. ammonia-rich fluid
c. feces
d. excess water
a
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When tropical forests are cut for agriculture, they often do not produce highly productive crop growth
What is probably limiting the growth of a crop in the tropical forest?
a. Sunlight. b. Rainfall. c. Carbon dioxide d. Soil nutrients. e. Bacteria.
The sharp reduction of the gene pool and the numbers of a population through a severe epidemic is an example of
a. artificial selection. b. genetic isolation. c. the bottleneck effect. d. the founder effect. e. natural selection.
DNA damage by UV radiation causes the synthesis of
a. p53. b. DNA. c. Cdk. d. cyclin. e. p21.
Protein degradation in eukaryotes is performed by
A. proteasome. B. ATP synthase. C. cytoskeleton. D. flagellum. E. ribosome.