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PCB 3023 - Cell Biology Exam 2 Review Questions And Answers With 100% Correct Answers
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  • PCB 3023 - Cell Biology

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 ce...

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  • August 13, 2024
  • 13
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • PCB 3023 - Cell Biology
  • PCB 3023 - Cell Biology

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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

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