Some ecologists have proposed that environmental heterogeneity in the tropics leads to greater diversity of trees. Which of the following assumptions underlying this concept seem(s) unlikely?
A) Tropical plants recognize much finer habitat differences in the tropics than they do in temperate regions.
B) There is more environmental heterogeneity in the tropics than in temperate regions.
C) Both of the above.
Ans: C) Both of the above.
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The cells of visceral smooth muscles function as separate units, independent of neighboring cells.
Answer the following statement(s) true (T) or false (F)
The Mesozoic era lasted from about
A. 250 million years ago to 65 million years ago. B. 500 million years ago to 250 million years ago. C. 1 billion years ago to 500 million years ago. D. 65 million years ago to 2 million years ago. E. 540 million years ago to 250 million years ago.
Which of the following is NOT a major feature
of arthropods? a. jointed appendages b. exoskeleton c. paired segmental nephridia d. specialized and fused-together segments e. specialized sensory structures
Fatty acids usually have an even number of carbons in their structures. They are catabolized by a process called beta-oxidation. The end products of the metabolic pathway are acetyl groups of acetyl CoA molecules. These acetyl groups _____
A) directly enter the electron transport chain B) directly enter the energy-yielding stages of glycolysis C) are directly decarboxylated by pyruvate dehydrogenase D) directly enter the citric acid cycle