An earthworm that feeds on the remains of plants and animals is acting as a _____.
a. producer
b. secondary consumer
c. tertiary consumer
d. primary consumer
e. detritivore
Answer: e. detritivore
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Gamma irradiation is effective for sterilization because it
A) damages molecules irreversibly. B) is non-ionizing. C) penetrates well. D) destroys protein function, although DNA is undamaged. E) is penetrating and causes extensive molecular damage.
Inflammation of the tendons in the wrist is called
a. rheumatoid arthritis. b. carpal tunnel syndrome. c. a sprain. d. a prosthesis. e. degenerative wrist disease.
Considerable evidence indicates that the null model of community structure is incorrect because
A) each species responds independently of other species to the prevailing physical environment. B) interactions among species have no significant influence on community structure. C) when one species is removed, the populations of the other species are unaffected. D) species interactions modify the fundamental niche of the species involved, influencing their relative abundance and, in some cases, their distribution.
A ________ bond links two amino acids together.
Fill in the blank(s) with the appropriate word(s).