Movement of a cell toward a chemical stimulus is termed ________.
Fill in the blank(s) with the appropriate word(s).
chemotaxis
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The thin filament contains _____ molecules.
A. actin B. myosin C. troponin D. tropomyosin E. All of the choices are correct except myosin
Flight requires greater efficiency of oxygen delivery. Therefore, birds have a unique respiratory system that allows them to filter oxygen. During the initial inhalation, the air passes through the trachea and into the . During the second inhalation, the oxygen-depleted gas moves to the , and is then exhaled.
A. posterior air sacs; anterior air sacs B. lamellae of the gills; anterior air sacs C. anterior air sacs; posterior air sacs D. lamellae of the gills; bronchioles E. bronchioles; capillaries
When signal molecules bind to two tyrosine kinase receptors, the receptors move closer to each other and form a
monomer. __________________ Indicate whether the statement is true or false.
Which of the following is synonymous with cellular senescence?
a. the loss of proliferative ability b. the gain of proliferative ability c. the gain of contact inhibition d. the loss of contact inhibition