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

Biology & Microbiology

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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.

Biology & Microbiology

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.

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Who invented the first crude microscope by grinding glass?

A. Pasteur B. Schultz and Schwann C. Redi D. Lister E. Leeuwenhoek

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In an enzyme-catalyzed reaction, the reactant is called the

A. product. B. catalyst. C. coenzyme. D. substrate.

Biology & Microbiology