Lecture 12 Flashcards
Which cytoskeleton component(s) can be assembled and disassembled quickly?
Actin filaments and microtubles
Which organelle(s) participate in protein folding?
Golgi complex and rough endoplasmic reticulum
Which shape will have the lowest surface area to volume ratio?
Sphere
Which of the following is true about cells that specialize in nutrient absorption?
They have a high surface area to volume ratio
Which type of lipid composition would require the greatest amount of energy to pull into microvilli?
Membrane with a high concentration of cholesterol
To make microvilli, which of the following is not necessary?
Intermediate filaments
The cell membrane and the Endoplasmic Reticulum have the same lipid composition.
False
If you wanted the smallest diameter tube which types of lipids should you use?
Rigid Lipids
The cytoskeleton is composed of
what type of biomolecule(s)?
Proteins
What are the 3 types eukaryotic cytoskeletal proteins?
Microtubules
Microfilaments (actin) Intermediate filaments
What are the functions of Actin or
microfilaments?
-Serves as a track for myosin, a motor protein
-Assemble and disassemble quickly and involved in cell movement/motility
-Provides cell structure
What functions does the intermediate fibers perform?
-More permanent than actin
-One type is made of keratin and found in hair, nails, & skin
-Play mainly a structural role for cells and organelles
*Maintains cell shape
*anchors nucleus
What is the purpose of mircotubles?
-Largest diameter
-Grow and shrink quickly
-Provide track for kinesin and dynein motor proteins
**Function in vesicle and protein trafficking
- Play a structural role & help cells resist compression
Which of the following can pass
easily through the cell membrane?
Small Hydrophobic lipids (steroids)
Which tube will have the smallest volume if it is 1 mm long?
Normal vesicles
