Which zone is inhabited by bottom-feeding catfish, crayfish, aquatic worms, clams, and bacteria?
A) Limnetic B) Benthic C) Pelagic D) Profundal E) Intertidal
D
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The noncoding regions of a primary mRNA transcript that interrupt coding regions are known as:
A. exons. B. introns. C. poly(A) tails. D. 5' caps.
In order to test a hypothesis, a scientist would measure which of the following during an experiment?
a. the independent variable b. the dependent variable c. the standard variable d. the constant
Which of the following organelles is NOT involved with protein synthesis?
A. The rough endoplasmic reticulum B. The Golgi complex C. The nucleus D. The lysosomes E. All of these organelles are involved in protein synthesis
Radula modification allowed all of the following functions in gastropods except
A. eating vegetation. B. boring holes in other mollusk shells. C. injecting poison through a harpoon-like structure. D. protecting themselves with nematocysts. E. scraping algae off rocks.