PCB 3023 - Cell Biology Exam 2 Review
common characteristics of cytoskeletal filaments - 1. They are dynamic and adaptable
2. They can form stable structures
3. Assemble from small subunits
movements exhibited by lipids in membranes - 1. lateral diffusion
2. trasverse fluctuation
3. rotation
4. flexion
5. flip-flop
where can cell membranes be found? - 1. enclosing the cell
2. enclosing the organalles
why does the mitochondria has two membranes? - to increase the surface area inside
membrane functions - 1. define boundaries to regulate the
a. chemical composition of the region they enclose
b. interaction of the region they enclose with their external environment
2. define boundaries that are soft and flexible which allow for
a. receiving information
b. import and export of small molecules
c. capacity for movement and expansion
(T/F) The aggregation of the hydrophobic ends of lipids lowers the free energy of the solution. -
true
, the region formed by the hydrophobic tales of lipids is known as - the hydrophobic core
a cell membrane is composed of - 1. phospholipids
2. glycolipids
3. cholesterol
phospholipids found in a cell membrane - 1. phosphatidylethanolamine
2. phosphatidylserine (negative)
3. phosphatidylcholine
glycolipids - glycosyl derivatives of lipids, that is, they have one or more monosaccharide residues
bound by a glycosidic linkage
(T/F) glycolipids are phospholipids - false
a cholesterol consists of - 1. a polar head group
2. a rigid planar steroid ring structure
3. a nonpolar hydrocarbon tail
flippases - enzymes that regulate asymmetry in the membrane
lipid synthesis occurs primarily in - the ER
phospholipids are synthesized - only in the cytosolic monolayer of the ER membrane
(T/F) membranes lose their orientation during transport - false
common characteristics of cytoskeletal filaments - 1. They are dynamic and adaptable
2. They can form stable structures
3. Assemble from small subunits
movements exhibited by lipids in membranes - 1. lateral diffusion
2. trasverse fluctuation
3. rotation
4. flexion
5. flip-flop
where can cell membranes be found? - 1. enclosing the cell
2. enclosing the organalles
why does the mitochondria has two membranes? - to increase the surface area inside
membrane functions - 1. define boundaries to regulate the
a. chemical composition of the region they enclose
b. interaction of the region they enclose with their external environment
2. define boundaries that are soft and flexible which allow for
a. receiving information
b. import and export of small molecules
c. capacity for movement and expansion
(T/F) The aggregation of the hydrophobic ends of lipids lowers the free energy of the solution. -
true
, the region formed by the hydrophobic tales of lipids is known as - the hydrophobic core
a cell membrane is composed of - 1. phospholipids
2. glycolipids
3. cholesterol
phospholipids found in a cell membrane - 1. phosphatidylethanolamine
2. phosphatidylserine (negative)
3. phosphatidylcholine
glycolipids - glycosyl derivatives of lipids, that is, they have one or more monosaccharide residues
bound by a glycosidic linkage
(T/F) glycolipids are phospholipids - false
a cholesterol consists of - 1. a polar head group
2. a rigid planar steroid ring structure
3. a nonpolar hydrocarbon tail
flippases - enzymes that regulate asymmetry in the membrane
lipid synthesis occurs primarily in - the ER
phospholipids are synthesized - only in the cytosolic monolayer of the ER membrane
(T/F) membranes lose their orientation during transport - false
