Molecular biology can be used to support the theory of evolution. Which of the following is an example of molecular biology being used for this purpose?
A) comparing the DNA of a freshwater and saltwater snail
B) recognizing that the wings of flies and the wings of bats are analogous structures
C) observing how embryos of frogs and humans develop
D) identifying the geographic areas where different finches live
Ans: A) comparing the DNA of a freshwater and saltwater snail
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Each of the following statements about carbon is TRUE EXCEPT which one?
A) All organic molecules contain carbon. B) Carbon atoms form four covalent bonds. C) Carbon atoms form diverse molecules that may be linear, branched, or circular. D) Carbon can form strong hydrogen bonds with other elements. E) Carbon can form bonds with hydrogen, oxygen, nitrogen, as well as another carbon atom.
An animal that relies on a digestive tract for digestion breaks down food by
a) intracellular digestion only b) both intracellular and extracellular digestion c) extracellular digestion only d) neither intracellular nor extracellular digestion
When fat enters the duodenum, which hormone is stimulated to be released?
a. amylase b. secretin c. gastrin d. cholecystokinin
The notion that organisms have hierarchical levels of structure refers to their