BIOS-251: Exam 2 Review Questions And
Correct Answers
- Acts as a "gate" that allows communication between two cells; allowing ions and other
molecules to pass between two cells
- Formed by ring-like connexons
- Found in cardiac and smooth muscle, embryonic tissue, lens and cornea - ANSWER Gap
Junctions
- Anchoring junctions that prevent cells from being pulled apart
- Form very strong structural network, contributes to integrity of cytoskeleton of cell
- Resists twisting and stretching, provides strength and withstands mechanical stress. - ANSWER
Desmosomes
- Column-shaped cells arranged in multiple layers.
- Found in the conjunctiva, pharynx, anus, and male urethra. - ANSWER Stratified Columnar
Epithelium
- Densely packed, parallel collagen fibers Compressed fibroblast nuclei
- Elastic tissue forms wavy sheets in some locations
- Tendons attach muscles to bones and ligaments hold bones together - ANSWER Dense Regular
Connective Tissue
- Densely packed, randomly arranged, collagen fibers and few visible cells
- Withstands unpredictable stresses
- Locations: deeper layer of skin; capsules around organs - ANSWER Dense Irregular Connective
Tissue
- Empty-looking cells with thin margins; nucleus pressed against cell membrane•Energy storage,
insulation, cushioning
- Subcutaneous fat and organ packing
, - Brown fat of juveniles produces heat - ANSWER Adipose Connective Tissue
- Forms nearly impermeable barrier
- Found in epithelial regions where tissue is required to be "sealed off" from extracellular fluid -
ANSWER Tight Junctions
- Has striations
- Usually has a single nucleus
- Joined to another muscle cell at an intercalated disc
- Involuntary
- Found only in the heart - ANSWER Cardiac Muscle
- Hollow, cylindrical organelle that disposes of unnecessary and damaged proteins
- Contain enzymes that break down tagged, targeted proteins into short peptides and amino
acids - ANSWER Proteasomes
- Lacks striations
- Spindle-shaped cells
- Single nucleus
- Involuntary—no conscious control
- Found mainly in the walls of hollow organs - ANSWER Smooth Muscle
- Layer between epithelium and underlying connective tissue
- Composed of collagen, reticular proteins, glycoproteins, other protein-carbohydrate complexes
- ANSWER Basement Membrane
- Located near the nucleus and help to organize cell division
- Form mitotic spindle during mitosis - ANSWER Centrioles
- Looks multilayered, but all cells touch basement membrane
- Nuclei at several layers
- Has cilia and goblet cells
- Secretes and propels mucus
Correct Answers
- Acts as a "gate" that allows communication between two cells; allowing ions and other
molecules to pass between two cells
- Formed by ring-like connexons
- Found in cardiac and smooth muscle, embryonic tissue, lens and cornea - ANSWER Gap
Junctions
- Anchoring junctions that prevent cells from being pulled apart
- Form very strong structural network, contributes to integrity of cytoskeleton of cell
- Resists twisting and stretching, provides strength and withstands mechanical stress. - ANSWER
Desmosomes
- Column-shaped cells arranged in multiple layers.
- Found in the conjunctiva, pharynx, anus, and male urethra. - ANSWER Stratified Columnar
Epithelium
- Densely packed, parallel collagen fibers Compressed fibroblast nuclei
- Elastic tissue forms wavy sheets in some locations
- Tendons attach muscles to bones and ligaments hold bones together - ANSWER Dense Regular
Connective Tissue
- Densely packed, randomly arranged, collagen fibers and few visible cells
- Withstands unpredictable stresses
- Locations: deeper layer of skin; capsules around organs - ANSWER Dense Irregular Connective
Tissue
- Empty-looking cells with thin margins; nucleus pressed against cell membrane•Energy storage,
insulation, cushioning
- Subcutaneous fat and organ packing
, - Brown fat of juveniles produces heat - ANSWER Adipose Connective Tissue
- Forms nearly impermeable barrier
- Found in epithelial regions where tissue is required to be "sealed off" from extracellular fluid -
ANSWER Tight Junctions
- Has striations
- Usually has a single nucleus
- Joined to another muscle cell at an intercalated disc
- Involuntary
- Found only in the heart - ANSWER Cardiac Muscle
- Hollow, cylindrical organelle that disposes of unnecessary and damaged proteins
- Contain enzymes that break down tagged, targeted proteins into short peptides and amino
acids - ANSWER Proteasomes
- Lacks striations
- Spindle-shaped cells
- Single nucleus
- Involuntary—no conscious control
- Found mainly in the walls of hollow organs - ANSWER Smooth Muscle
- Layer between epithelium and underlying connective tissue
- Composed of collagen, reticular proteins, glycoproteins, other protein-carbohydrate complexes
- ANSWER Basement Membrane
- Located near the nucleus and help to organize cell division
- Form mitotic spindle during mitosis - ANSWER Centrioles
- Looks multilayered, but all cells touch basement membrane
- Nuclei at several layers
- Has cilia and goblet cells
- Secretes and propels mucus
