The study of the interrelationships of plants and animals with each other and with their environment is known as
Select one:
a. a trophic level.
b. a food web.
c. a habitat.
d. a biosphere.
e. ecology.
e. ecology.
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Which one of the following is not a component of an amino acid?
A. an alpha carbon B. an amino group C. a carboxyl group D. an R group E. a phosphate group
Once species have formed, they keep their identity by
A. developmental differences. B. genetic blocks. C. isolating mechanisms. D. somatic mutations. E. structural modifications.
Which element is considered a macronutrient needed by plants?
A. Manganese B. Iron C. Copper D. Potassium E. Boron
The extent of complementarity of a miRNA with its target mRNA determines ___________________________
(a) whether the mRNA will be immediately degraded or whether the mRNA will first be transported elsewhere in the cell before degradation. (b) whether the mRNA will be transported to the nucleus. (c) whether RISC is degraded. (d) whether the miRNA synthesizes a complementary strand.