Glucose enters cells by
A. osmosis.
B. diffusion.
C. active transport.
D. receptor-mediated endocytosis.
E. facilitated transport.
Answer: E
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a. the biosphere b. a community c. an ecosystem d. a niche e. the habitat
Helper T cells activate both B cells and cytotoxic T cells.
Answer the following statement true (T) or false (F)
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According to the operon model, for the synthesis of an inducible enzyme to occur, the
A) end-product must not be in excess. B) substrate must bind to the enzyme. C) substrate must bind to the repressor. D) repressor must bind to the operator. E) repressor must not be synthesized.