The micronutrient iron is abundant in soil, but often unavailable to plants due to insolubility
Knowing that the reaction Fe(OH)3 + 3 H+ ? Fe3+ + 3 H2O occurs, and assuming all soil samples have the same total amount of iron, which type of soil would you predict to have the highest amount of soluble iron?
A) neutral
B) acidic
C) alkaline
D) The amount of iron in soil does not depend on pH.
Answer: B
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When an allele can produce a range of phenotypes, its expression is said to be
a. clearly established. b. variable. c. codominant. d. incompletely dominant. e. incompletely penetrant.
Which of the following provides insulation for the neuron?
a. synapse b. axon c. dendrite d. Schwann cell e. microglial cell
A centrosome is
a. a cylindrical structure made up of nine triplets of microtubules. b. a chromosomal region that connects sister chromatids during mitosis and attaches them to the spindle. c. a protein structure that binds centromeres and mediates the attachment of chromosomes to the spindle. d. the major microtubule-organizing center in animal cells.
C4 plants occur more commonly in desert conditions because _________.
A. C4 plants produce water as a product of their photosynthetic pathways. B. C4 plants can shuttle CO2 to the sites of photosynthesis even when their stomata are closed to conserve water. C. C4 plants can conserve water even with their stomata open. D. C4 plants are succulent (water-storing) plants.