The functional unit of a muscle cell is:
A. a muscle fiber
B. the sarcomere
C. myosin
D. actin
B
Biology & Microbiology
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Which cytoskeletal proteins are important constituents of the contractile structures that form the cleavage furrows involved in animal cell cytokinesis?
A) actin B) dynein C) tubulin D) myosin
Biology & Microbiology
A population's __________ is the average number of children born to women during their reproductive
years. Fill in the blank(s) with the appropriate word(s).
Biology & Microbiology
What is the definition of "swidden"?
A) tundra B) slash-and-burn agriculture C) the boreal forest D) biome
Biology & Microbiology
Identify the organism in the picture and the supergroup it belongs to. What characteristic(s) helped you to identify the organism? 
What will be an ideal response?
Biology & Microbiology