259.    The projections indicated as letter B are
(A)    cilia
(B)    mcrovilli
(C)    flagella
(D)    basal bodies
(E)    focal adhesion points

254.    The elongate cellular projection labeled A is a
(A)    flagellum
(B)    nerve axon
(C)    pseudopodium
(D)    cilium
(E)    microvillus
255.    Structure labeled C is
(A)    Golgi Apparatus
(B)    pseudopodium
(C)    cilium
(D)    mcrovillus

247.    Which statement is LEAST ACCURATE?
(A)    The polarity of microtubules is related to the fact that the tubulin subunit is a heterodimer of ? and ? subunits.
(B)    Actin filaments often associate with special patches of the plasma m mbrane.
(C)    Kinesin is an ATPase that may interact with microtubules.
(D)    Intermediate filaments are assembled in the intermediate […]

243.    Microfilaments
(A)    are 4-7 nm in diameter
(B)    contain the proteins actin and keratin
(C)    cause the anterograde movement of mitochondria in axons
(D)    form the dense mass of filaments attaching to desmosomes
(E)    bind chromosomes to the mitotic spindle

Tissue-culture microscope 3.6 is a scanning electron micrograph of the apical surface on the epithelial cells lining the trachea. For each numbered item of identity or functions, choose the ONE best answer.
237.    The structures labeled A are
(A)    cilia
(B)    flagella
(C)    microvilli
(D)    microtubules
(E)    collagen fibers
238.    The structures labeled B are

Tissue-culture microscope 3.5 is a freeze-fracture electron micrograph of  the apical surfaces of epithelial cells lining the lumen of the ileum. For each numbered item naming, or stating the function of a specific structure, choose the ONE best answer.
232.    The surface projections indicated by the
(A)    microveilli
(B)    cilia
(C)    basal bodies
(D)    desmosomes
(E)    flagella

Examine the transmission electron micrograph of skeletal muscle in Tissue-culture microscope 3.4 below. Match the labeled structure in the micrograph with the most appropriate description of its microscopic anatomy or physiological role.
227.     These structures are the ends of individual sacromeres. They are regions rich in ?-actin.
228.     These structures are regions of overlap between […]

Examine the high power transmission electron micrograph of cell surface projections in Tissue-culture microscope 3.3 below. These projections are cut perpendicular to their long axis. For each numbered item of a functional role choose the most appropriate component labeled with a letter in the electron micrograph.

Examine the high power transmission electron micrograph in Tissue-culture microscope 3.2 below. It is an array of long hollow structures cut perpendicular to their long axis. The diameter of each hollow structure is 25 nm.
218.     Each individual hollow structure is a
(A)    microfilament
(B)    ciliary axoneme
(C)    microtubule
(D)    thick filament of muscle
(E)    intermediate filament

For each item, choose the most appropriate answer.
215.     The axoneme of a cilium
(A)     has 9 single microtubules arranged around a central pair of doublet microtubules
(B)     contains several ATPase, including myosin
(C)     is very similar to the oxoneme of a sperm flagellum
(D)     shortens by about 25% when stimulated by Ca 2+ ions
(E)      normally is activated by […]