Integration of sensory stimuli occurs in
A) highly specialized receptors such as the organ of Corti.
B) all receptors.
C) the brain.
D) the central and peripheral nervous systems.
Answer: C
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Cellular crawling motion is accomplished by:
A. the polymerization of microfilaments along the leading edge in response to an activated cell surface receptor. B. the depolymerization of microfilaments along the leading edge in response to an activated cell surface receptor. C. the contraction of microfilaments along the leading edge in response to an activated cell surface receptor. D. the polymerization of microfilaments along the trailing edge in response to an activated cell surface receptor. E. All of these choices can contribute to rapid shifting of direction of crawling motion.
When she finds that the introduced strand separates into single-stranded RNAs, what other evidence of this single-stranded RNA piece's activity can she find?
A) She can measure the degradation rate of the remaining single strand. B) The rate of accumulation of the polypeptide encoded by the target mRNA is reduced. C) The amount of miRNA is multiplied by its replication. D) The cell's translation ability is entirely shut down.
Which one of the following is a plant micronutrient?
A) iron B) oxygen C) sulfur D) phosphorus
Which of these is not gametic isolation?
A) Female stigma destroys germinating pollen grain. B) Lily sperm cannot fertilize tulip eggs. C) Male and female sex organs do not fit together. D) Pollen grain does not germinate on stigma (female structure).