Stains most often used in histology - correct answer hematoxylin and eosin
hematoxylin-basic and stains acidic portions (nucleus rNA )
-eosin is acidic dye stains basic components of the cell
-reddish orange
Cytoplasm - correct answer ...
Stains most often used in histology - correct answer hematoxylin and eosin
hematoxylin-basic and stains acidic portions (nucleus rNA )
-eosin is acidic dye stains basic components of the cell
-reddish orange
Cytoplasm - correct answer
Plasma membrane - correct answer lipid components: phospholipids and
cholesterol
phospholipid is amphipathic
-bilayer structure
-sometimes have sugar molecules that hang on the outside
-has a trilaminar apperance
-fuzzy membrane on the outer is the gylcocalyx
contains integral proteins and transmembrane proteins
Membrane proteins - correct answer have covalently attached oligosaccharide
chains exposed at the membrane surface
contribute to the cells glycocalyx- antigenic and functional properites
-serve as receptors
-transmembrane proteins often have multiple hydrophobic regions within the bilayer
Three types of endocytosis - correct answer phagocytosis, pinocytosis and
Phagocytosis - correct answer extension from the cell of large folds called
pseudopodia that engulf particles and internalize material into a vacuole or phagosome
, Pinocytosis - correct answer cell membrane invaginations and forms a pit
containing a drop of extracellular fluid and pinches off inside the cell, forms a pincytotic vesicle
Receptor mediated endocytosis - correct answer includes membrane proteins
called receptors that bind specific molecules (ligands) when enough are bound by their ligand they
aggregate in a region that invaginate and creates a endosome containing the receptor and the bound
ligands
Ribosomes - correct answer tranlate mRNA
-free polyribosomes
ribosomes associated with the ER
RER - correct answer ribosomes associated with the membrane,
coninutity between the RER and SER
RER is the site for synthesis of most membrane-bound proteins,
The interconnected membranous cisternae of RER are flattened, while those of SER are frequently
tubular.
SER - correct answer three diverse activities are associated with smooth ER:
(1) lipid biosynthesis, (2) detoxification of potentially harmful compounds, and (3) sequestration of Ca++
ions. Specific cell types with well-developed SER are usually specialized for one of these functions.
Protein localization and cell morphology - correct answer o The ultrastructure
and general histologic appearance of a cell are determined by the nature of the most prominent
proteins the cell is making.
Cells that make few or no protein - correct answer for secretion have very
little RER, with essentially all polyribosomes free in the cytoplasm.
ERYTHROCYTES
Cells that synthesize, segregate and store various proteins in specific secretory vesicles - correct answer
always have RER, a Golgi apparatus, and a supply of granules containing the proteins ready to be
secreted.
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