A purine or pyrimidine that is attached to a sugar, either ribose or deoxyribose, which is attached to one or more phosphate groups is called a ________.
A. nitrogenous base
B. nucleic acid
C. nucleoside
D. nucleotide
Answer: D
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Which of the following statements about tunicates is incorrect?
A. Tunicates are nonvertebrate chordates. B. Tunicates are all marine animals. C. Tunicates are sessile as adults. D. Tunicate larvae are tadpole-like with all of the basic chordate characteristics. E. Tunicate larvae can reproduce.
Which of the following statements is (are)
TRUE about radioisotopes?
a. Radioisotope decays at a constant rate. b. Decay of a radioisotope is independent of temperature. c. Decay of a radioisotope is independent of pressure. d. A radioisotope decays into a predictable product. e. All of these are true.
Filopodia that are supported by microtubules are known as ________.
A. axopodia B. micropodia C. reticulopodia D. lophopodia E. tubulopodia
The lac operator site within the lac operon is an example of a
A. trans-acting element. B. contra-acting element. C. para-acting element. D. cis-acting element. E. inter-acting element.