Thick- skinned rhinoceroses and elephants were once classified together as pachyderms (meaning "thick skin"). They actually descended from different ancestors that in turn evolved from a thin-skinned common ancestor that was not included in the pachyderms. Pachyderms were therefore, as a taxon,
A. monophyletic.
B. polyphyletic.
C. paraphyletic.
D. a supergroup.
E. a kingdom.
B. polyphyletic.
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Restriction fragment length polymorphisms are used to
a. test the effectiveness of different restriction enzymes on a sequence of DNA. b. compare the DNA sequences between individuals by looking for changes in restriction enzyme digest patterns. c. compare DNA sequences by determining the full DNA sequence. d. prepare DNA for further sequence analysis. e. treat sickle-cell anemia.
Homologous chromosomes
A) are in pairs, one chromosome of each pair from the father and one from the mother. B) have alleles for the same characteristics even though the gene expression may not be the same. C) pair up during meiosis. D) may exchange parts during meiosis. E) All of the choices are correct.
Which is NOT a function of the cytoskeleton?
a) maintains a cell's shape b) allows cells to move c) allows transport within a cell d) secretes the calcium for bone tissue
This type of mechanoreceptor is found in the lips, nipples, and fingertips and helps us to precisely determine contact with something else
A) free nerve endings B) Pacinian corpuscles C) Meissner's corpuscles D) hair root plexus