Why are anionic nutrients generally mobile in soils, and thus easily leached, while cationic nutrients are relatively immobile?
A) Anions readily form crystals while cations do not
B) Cations interact with clay particles and organic materials
C) Cations have a stronger tendency to aggregate
D) Anions are repelled from the surfaces of living roots
Answer: B
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Which of the following features would be used to construct a phylogenetic tree?
A. homologous structures B. mtDNA sequences C. fossil record data D. amino acid sequences E. All of the answer choices are correct.
After blood flows through the right ventricle of the human heart, its next major destination is
A. the arms. B. the systemic system. C. the lungs. D. the left ventricle.
What type of vaccine is the hepatitis B vaccine?
A) inactivated whole pathogen B) attenuated vaccine C) toxoid vaccine D) a recombinant vaccine composed of a single antigen of the hepatitis virus E) a vaccine produced by treating the virus with formaldehyde
The stages of the cell cycle that includes growth, DNA doubling, and when the nucleus is not actively dividing, are collectively called
Fill in the blank(s) with the appropriate word(s).