841. Intracellular digestion is a chief function of the
A. Golgi apparatus
B. endoplasmic reticulum
C. lysosomes
D. residual bodies
E. mitochondria

842. Which one of the following structures is visible in the light microscope?
A. mitochondrion
B. ribosomes
C. tight junction
D. smooth endoplasmic reticulum
E. plasma membrane

843. The basal body of a cilium has a tubular filament arrangement which is identical to thepattern found in
A. Microvilli
B. centrioles
C. spindle fibers
D. stereocilia
E. microtubules

844. Which one of the following junctions is characterized by the fusion of the outer leaflets ofthe cell membranes of adjacent cells?
A. zonula adherens
B. desmosomes
C. macula adherens
D. gap junctions
E. tight junctions (zonula occludens)

845. Cytoplasmic basophilia is characteristic of cells that
A. are actively producing steroid hormones
B. have abundant DNA in the cytoplasm
C. are in the S stage
D. are synthesizing large amounts of protein
E. exhibit a conspicuous Golgi complex

846. The exocrine cells secrete all of the following except
A. amylase
B. gastrin
C. prochymotrypsin
D. lipase
E. protrypsin

847. Bile is formed by
A. sinusoidal endothelium
B. stromal cells
C. lymphocytes
D. (von) Kupffer cells
E. hepatic cells (hepatocytes)

848. The esophagus is subdivided into three portions along its course on the basis of atransition in the composition of the
A. submucosa
B. mucosal layer
C. adventitia
D. muscularis externa
E. none of the above

849. Plicae circularis (valves of Kerkring) are present in
A. stomach
B. ileum
C. duodenum
D. jejunum
E. all but the stomach

850. The epithelium of the gallbladder is composed of
A. simple columnar epithelium
B. psuedostratified epithelium
C. ciliated columnar epithelium
D. stratified squamous epithelium
E. simple squamous epithelium

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