Which of the following must be true for an object to be in a state of static equilibrium?
A. the sum of all vertical forces acting on the object must be equal to zero
B. the sum of all horizontal forces acting on the object must be equal to zero
C. the sum of all torques acting on the object must be equal to zero
D. all of the above must be true
D. all of the above must be true
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A primary active transport process is one in which __________.
A)molecules pass directly through the phospholipid bilayer of the plasma membrane B)the plasma membrane folds inward to form a vesicle containing extracellular material C)an intracellular vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid D)molecules move across the plasma membrane without an input of energy E)molecules move through transport proteins that have been activated by ATP
Neural tissue develops in the embryo from a portion of the
A. ectoderm. B. endoderm. C. mesoderm.
The collapsible, muscular tube that is situated behind the trachea is called the ____
a. esophagus b. mediastinum c. pharynx d. larynx
The special name for the plasma membrane of a muscle fiber is
A. sarcoplasmic reticulum. B. sarcolemma. C. sarcoplasm. D. T tubules.