Which statement about the cytoskeleton is INCORRECT?
The cytoskeleton is a static structure.
The cytoskeleton helps maintain cell shape.
The cytoskeleton maintains organelles position.
The cytoskeleton is important for the movement of vesicles.
The cytoskeleton is highly dynamic reactive( dynamic, reactive ), but still provides stability some structure( stability, some structure ).
There are four components of the cytoskeleton: microtubules, microfilaments, intermediate filaments, and terminal ends.
Choose the INCORRECT statement about the cytoskeleton's components.
Microtubules are the smallest filaments in the cytoskeleton.
Microfilaments are made up of a double chain of actin.
Microfilaments resist tension and are distributed in the outer cytoplasm (cortex).
Intermediate filaments are usually made of keratin, which is supercoiled into cables.
Intermediate filaments build the nuclear lamina, and anchor organelles.
Microtubules resist ❌, while microfilaments resist ❌.
Choose the CORRECT statements about microtubules.
Microtubules can make up flagella and cilia, allowing whole cell movements or movement of external fluid.
Microtubules often originate from the peroxisome.
Motor proteins travel along microtubules.
Microtubules are composed of α-tubulin and β-tubulin.
Microtubules are the most stable of the filaments.
Microfilaments are the only filaments in the cytoskeleton that form 3D networks with proteins.
Choose the statement about cell junctions which is CORRECT.
Tight junctions form a continuous seal which prevents fluid loss.
Desmosomes provide pores between cells to transport ions and communicate via (a cytoplasmic connection.)
Gap junctions anchor adjacent cells, acting like a rivet.
Muscle cells have few desmosomes.
Which statement about collagen in the ECM is NOT correct?
Collagen makes up about 50% of total body protein.
Collagen resists compression.
Collagen is 'turned over', or, recycled.
Collagen is a glycoprotein secreted by fibroblasts.
The base of the ECM is proteoglycan—an extensively sugared protein.
Proteoglycan in the ECM resists tension and traps water.