The primary reservoir for calcium that is released during excitation-contraction coupling in a skeletal muscle fiber is
A. sarcoplasmic reticulum.
B. endoplasmic reticulum.
C. transverse tubules.
D. Golgi bodies.
E. troponin.
A. sarcoplasmic reticulum.
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Viroids are naked (lacking a protein shell) pieces of DNA that infect plants
Indicate whether this statement is true or false.
Imagine you have extracted myosin molecules from both fast and slow muscle fibers and are measuring the rate at which these proteins hydrolyze ATP. What would these relative rates of ATP hydrolysis be?
A. fast fiber > slow fiber B. slow fiber > fast fiber C. slow fiber = fast fiber
Which cycle involves materials moving through a series of transfers from living to nonliving systems and then back again?
A) biogeochemical B) geological C) uranium-lead D) continental
Endospores .
a. are reproductive structures of some bacteria b. occur in some archaea c. can cause shock, fever, and inflammation d. are dormant, resistant cells