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BIO 250 EXAM 1/86 QUESTIONS AND ANSWERS (A+)
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BIO 250 EXAM 1/86 QUESTIONS AND ANSWERS (A+)
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BIO 250 EXAM 1/86QUESTIONS AND
ANSWERS (A+)
What are microfilaments made of?
Function? - √Answer>Actin
1. Anchor cytoskeleton to integral proteins-
stabilizes position of membrane proteins, provides
additional mechanical strength to cell, firmly
attaches plasmalemma to underlying cytoplasm
2. Actin microfilaments interact w/ structures made
of myosin- active movement of portion of cell or
change cell shape
-What are intermediate filaments made of?
What are they defined by?
Function? - √Answer>varies from one cell type to
another
Defined by size
Strength, stabilize positions of organelles,
transport materials w/in cytoplasm
-What are thick filaments made of?
Function? - √Answer>myosin
,Interact with actin filaments to produce powerful
contractions
-What are microtubules made of?
Function? - √Answer>Tubular
1.Form primary components of cytoskeleton-
strength and rigidity and anchors positions of
organelles
2. Assembly/disassembly changes shape of cell
3. Attaches to organelles and other intracellular
materials and moves them around cell
4. Form spindle apparatus in cell division
5. Structural components of organelles
-Peroxisome functions
Where are they most abundant? -
√Answer>Oxidases- break down organic
compounds into hydrogen peroxide and then
convert to water and oxygen
Absorb and break down fatty acids
liver cells- remove toxins in digestive tract
-CAMs (cell adhesion molecules) -
√Answer>transmembrane proteins that connect
large areas of opposing plasmalemma
, Bind to each other and other extracellular
materials
-Communicating junctions v. adhering junctions v.
anchoring junctions - √Answer>Held together by
membrane proteins called connexions (Challen
proteins)
Common in epithelial cells, cardiac muscle,
smooth muscle
Tight junction- lipid portions are tightly bound by
interlocking membrane proteins
Seals off any intercellular space
Require cells to utilize some active process to
pass material
mechanically link 2 adjacent cells at lateral
surfaces or link epithelial cell to underlying basal
lamina
Accomplished by CAM and proteoglycans
Resist stretching and twisting
-What are the 2 types of anchoring junctions on
lateral surfaces? - √Answer>Zonula adherens-
sheetlike junction that stabilizes lateral surfaces of
adjacent epithelial cells
Macula adherens- small, localized spot like
junctions that stabilize epithelial cells
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