Vimentin is the major intermediate filament protein of _______ cells.
a. epithelial
b. striated muscle
c. nerve
d. fibroblast
e. None of the above
Ans: d. fibroblast
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When transporting charged molecules across a membrane, which of the following is/are true?
A) When moving chloride ions in nerve cells, the movement is with both concentration and electrochemical gradients. B) ?G is dependent on electrochemical potential. C) Keq is always equal to zero. D) ?G° is always equal to one. E) Membrane potential is not a factor.
What is the correct sequence of events in cross-bridge cycling?
A. Myosin cross-bridge binds to actin, the powerstroke moves the thin filament relative to the thick filament, ATP binds to myosin and cross-bridge detachment occurs, ATP is hydrolyzed and the myosin head is "cocked" B. The powerstroke moves the thin filament relative to the thick filament, myosin cross-bridge binds to actin, ATP binds to myosin and cross-bridge detachment occurs, ATP is hydrolyzed and the myosin head is "cocked" C. Myosin cross-bridge binds to actin, ATP is hydrolyzed and the myosin head is "cocked," the powerstroke moves the thin filament relative to the thick filament, ATP binds to myosin and cross-bridge detachment occurs D. Myosin cross-bridge binds to actin, ATP binds to myosin and cross-bridge detachment occurs, the powerstroke moves the thin filament relative to the thick filament, ATP is hydrolyzed and the myosin head is "cocked" E. These events can occur in any sequence without affecting muscle function.
This figure illustrates the life cycle of a
a. brown algae. b. green algae. c. water mold. d. plasmodial slime mold. e. cellular slime mold.
Sieve pores are modification seen in vascular tissue that facilitate the movement of
What will be an ideal response?