15 Questions
Which process is essential for a variety of cellular functions, including cell motility, cell division, and cell shape maintenance?
Microfilament polymerization
Where does polymerization occur most rapidly in an actin filament?
Barbed end
Which structure forms a contractile ring that helps to divide the cytoplasm of the cell into two daughter cells?
Actin filament
What is the diameter of microtubules?
25 nm
Which type of movement are microfilaments responsible for?
Crawling movement
Which protein is known for its high tensile strength and resistance to pulling forces in the extracellular matrix?
Collagen
Which type of collagens are made up of triple helical monomers of either identical or different subunits?
Fibrillar collagens
What distinctive type of protein-polysaccharide complex is typically found in basement membranes and other extracellular matrices?
Proteoglycans
Which molecule forms gigantic complexes with proteoglycans in the extracellular matrix?
Hyaluronic acid
What type of subunits are joined by a pair of disulfide bonds near the C-terminal to form fibronectin?
Polypeptide subunits
What is the main function of the extracellular matrix (ECM) in a multicellular organism?
Regulating the shape and activities of the cell
How does the structure of proteins in the extracellular space differ from those inside the cells?
Proteins inside the cells tend to be extended and fibrous, whereas those in the extracellular space are usually compact and globular
In what way does the extracellular matrix (ECM) differ from an inert packing material or nonspecific glue?
It determines the shape and activities of the cell
Which term best describes the macromolecular organization of the extracellular matrix?
Extended and fibrous
What term is commonly used to describe the network of extracellular materials that is present beyond the immediate vicinity of the plasma membrane?
Extracellular matrix (ECM)
Test your knowledge of the cytoskeleton with this quiz covering the definition and introduction of cytoskeletal elements in cell biology. Explore the proteinaceous structures present in the cytoplasm and their role in providing shape and support to cells.
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