The many species of tree frogs that inhabit forests in the eastern United States maintain their genetic isolation from other species by several mechanisms, including "singing" slightly different songs. Which type of isolating mechanism does this
represent?
A) behavioral isolation B) ecological isolation
C) mechanical isolation D) temporal isolation
Answer: A
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Red algae
a. are primarily marine organisms. b. are thought to have developed from green algae. c. contain xanthophylls as their main accessory pigments. d. are actually brown. e. are all of these
In what way(s) can mRNAs be processed?
A) By adding caps and tails to the ends of the mRNAs B) By removing the introns (the noncoding regions) of the mRNAs C) By splicing the exons (the coding regions) of the mRNAs in different ways D) All of the above
Which of the following statements concerning the heart is false?
a. It is an organ. b. It contains endothelium. c. It contains nerves
d. It is an organ system. e. Its muscles contain elongated fibers.
Which of the following is not true regarding a motor unit?