The majority of the bulk of a lichen is
a. algae.
b. cyanobacteria.
c. fruiting bodies.
d. fungal mycelium.
D
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Homologues of the Sec protein translocation system are found in bacteria, eukaryotes, and archaea.
Answer the following statement true (T) or false (F)
Smooth muscle cells in the airways relax while those in the blood vessels contract in response to the hormone epinephrine. What would you expect to be different in these two types of cells exposed to epinephrine?
A. Types of proteins expressed. B. Presence of epinephrine receptors. C. Exposure to epinephrine released by neighboring cells. D. Rate of metabolism. E. Activation of protein kinases.
Bird wings and insect wings are considered to be examples of:
a. divergent evolution. b. homoplastic evolution. c. vestigial structures. d. convergent evolution. e. coevolution.
The plasma membrane of both eukaryotes and prokaryotes functions to:
A) regulate movement of molecules into and out of the cell B) secrete proteins from membrane-bound vesicles C) generate energy D) support the cell wall E) form biofilms