Various species of lightning bugs have their own characteristic patterns of light flashes. Females flash an answering code to the males' code, and mating follows the recognition. This is an example of a genetic isolating mechanism called
A. habitat preference.
B. seasonal isolation.
C. behavioral isolation.
D. introgressive hybridization.
C. behavioral isolation.
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The cytoskeleton
A. is a dynamic structure composed of microtubules, microfilaments, and intermediate filaments. B. is a static structure that gives a rigid shape to the cell. C. consists of flagella and cilia that are internalized. D. is not necessary for movement or reproduction. E. is a static structure that gives a rigid shape to the cell, consists of flagella and cilia that are internalized, AND is not necessary for movement or reproduction.
Which term is not used to describe bacterial cell shapes?
A. tetrad B. coccus C. spirochete D. vibrio E. rod
Different globin polypeptides are expressed at similar levels during the embryonic and fetal stages of mammalian development.
Answer the following statement true (T) or false (F)
The cells of the immune system that are responsible for attacking cells that have been infected with a virus are the:
a. B-cells b. cytotoxic T-cells c. helper T cells d. suppressor T cells (T regulatory cells)