How long does it take for an epithelial cell to migrate from the base of the villi to the tip?
a. 3 hours.
b. 3 days.
c. 1 day.
d. 3 month.
e. several weeks.
B
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Km in the Michaelis-Menten equation represents
A) The maximum amount of substrate that can be catalyzed by the enzyme. B) The amount of substrate required for the initial velocity to be half of the maximal velocity. C) The amount of substrate required to start an enzymatic reaction. D) A set constant used for all enzymatic reactions
Cardiac muscle tissue
a. has well developed sarcoplasmic reticulum b. has fast myosin ATPase activity c. contracts only when stimulated neurogenically d. has gap junctions e. stores calcium in its T tubules
What is responsible for muscle contraction?
A. Interaction with Sarcoplasmic reticulum and actin B. Interaction with Sarcoplasmic reticulum and myosin C. Interaction with Myosin and Actin filaments D. None of the above
The plasma membrane of the muscle fiber is known as the
A) cell surface membrane. B) sarcolemma. C) sarcoplasm. D) sarcoplasmic reticulum.