Which of the following statements BEST summarizes structural differences between DNA and RNA?
A. RNA is a protein, while DNA is a nucleic acid.
B. RNA is a polymer, but DNA is not.
C. DNA contains a different sugar than RNA.
D. RNA is a double helix, but DNA is not.
E. All the bases in DNA differ from those in RNA.
C. DNA contains a different sugar than RNA.
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Which blood vessels offer the most resistance to flow?
a. venules b. arterioles c. veins d. arteries e. capillaries
Concerns about the small size of humpback whale populations led to a collaborative study of their
a. geographic distribution. b. adaptive characteristics. c. population growth rates. d. environmental changes. e. genetic variability.
The root of a phylogenetic tree is the common ancestor of all the organisms included in the tree
1.True 2.False
Which of the following statements about biomes, the major terrestrial ecosystems covering the Earth, is true?
A) Each of the nine major biomes is restricted to just one or two continents. B) The major factors affecting the distribution of biomes are wind and sunlight. C) Most biomes are characterized by a particular group of species. D) Most natural biomes are unaffected by human activity. E) Fire is very important in some biomes.