A broad land or ocean region defined by climate,
geography, and producers is called
a. an ecoregion.
b. a hot spot.
c. a realm.
d. a habitat island.
e. the biosphere.
Answer: a
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The terminator versus anti-terminator function of the T box-based riboswitch used by Gram-positive bacteria to regulate amino acid-related genes is determined by
A. the binding of the T box binding protein. B. the utilization of the appropriate sigma factor by RNA polymerase. C. the rate of leader peptide synthesis. D. the binding of the appropriate uncharged tRNA.
The difference between a Class I and a Class II tRNA synthetase is:
A. the Class I synthetase requires ATP cofactor and the Class II does not. B. the Class I synthetase uses the 2'-OH of 3' end of the tRNA as a nucleophile and the Class II uses the 3'-OH. C. the Class II synthetase reaction requires a transesterification reaction not necessary in the Class I reaction. D. the Class II synthetases are typically monomeric, whereas the Class I enzymes frequently function as multimeric protein complexes.
Who invented the first crude microscope by grinding glass?
A. Pasteur B. Schultz and Schwann C. Redi D. Lister E. Leeuwenhoek
In an enzyme-catalyzed reaction, the reactant is called the
A. product. B. catalyst. C. coenzyme. D. substrate.