Because they are capable of regenerating a complete body from an arm and a piece of the central disk, sea stars must
contain many ____.
a. blood cells
b. stem cells
c. differentiated cells
d. marrow cells
e. embryonic cells
ANSWER: b
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Select the statements that provide direct biogeographical evidence for evolutionary theory. Check all that apply.
_____ Unrelated organisms from similar habitats exhibit similar characters. _____ Terrestrial mammals are not found naturally on any island greater than 300 miles from a mainland. _____ Organisms on islands are most similar to organisms on the nearby mainland, even when habitats on the mainland and island are quite different. _____ Invasive rats have colonized more than 80% of the world's islands.
Inside the CNS, groups of neuronal cell bodies that are clustered together to perform basic functions are termed
A. nerve nets. B. ganglia. C. nuclei. D. spinal cords. E. soma.
The graph above displays results from subjects in a study who responded to a questionnaire on character and temperament. The subjects had a known genotype for the DRD4 gene (associated with novelty-seeking behavior). Results are shown for the CC group and the CT and TT genotypes as another group. In the graph, what do the light blue bars represent?
What will be an ideal response?
A man with the autosomal recessive disorder phenylketonuria (PKU) and a woman without PKU have a son named Peter, who does not have PKU. Peter is curious about whether his mother is a carrier for PKU. Which of the following facts would allow him to know?
What will be an ideal response?