Which is incorrect about the Fc region of an immunoglobulin?
A. It contains an effector molecule that can bind to cells such as macrophages and mast cells.
B. It is called the crystallizable fragment.
C. It determines the class to which the immunoglobulin belongs.
D. It contains an effector molecule that can fix complement.
E. It forms the antigen binding sites.
Answer: E
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The earliest oxygenic phototrophs are thought to be
A. purple sulfur bacteria. B. green nonsulfur bacteria. C. purple nonsulfur bacteria. D. cyanobacteria. E. green nonsulfur bacteria AND purple nonsulfur bacteria.
Compared to low tidal marshes, high tidal marshes are characterized by
A) lower salinity. B) decreased input of nutrients. C) higher tidal exchange rates. D) a phenotypically taller, greener cordgrass (Spartina).
Which of the following is a member of the domain archaea?
a. proteobacteria b. gram positive bacteria c. methanogen d. spirochetes e. chlamydias
One of two of a ribosome's binding sites for tRNA during translation; The P site holds the tRNA carrying the growing polypeptide chain (P stands for peptidyl tRNA)
What will be an ideal response?