WorksheetsCytoskeleton and Extracellular Matrix
Total questions: 15
Worksheet time: 8mins
Which of the following filaments are found in ALL animal cells?
Keratins
Vimentins
Nuclear Lamins
Neurofilaments
Which of the following make up mitotic spindle?
Intermediate filaments
Microtubules
Nuclear Lamins
Actin filaments
Microtubules are
rope like
mesh like
hollow tubes
interlocking chains and ropes
The end of a growing microtubule is rich in which type of tubulin?
GTP bound tubulin molecules
GDP bound molecules
ATP bound tubulin
ADP bound molecules
During muscle contraction the myosin and actin filaments do not change length?
True
False
Inside a muscle fibre, what triggers sarcomeres to contract?
sudden rise in intracellular Na+
Increase levels of ATP
Cell polarisation
A sudden rise in intracellular Ca2+
When a muscle is stimulated to contract:
calcium binds to troponin which moves the tropomyosin that otherwise blocks the interaction of actin and myosin.
calcium binds to tropomyosin which moves the troponin that otherwise blocks the interaction of actin and myosin
calcium binds to actin allowing it to associate with myosin.
calcium binds to myosin allowing it to associate with actin
Supportive tissues such as bone, get their strength from
cells
extracellular matrix
cytoskeleton filaments
In connective tissues the tensile strength of the tissue is provided by
Proteoglycans
Collagen
Actin
Cellulose
Which protein on a fibroblast membrane attaches to the extracellular matrix outside the cell (through adapter molecules) to actin on the inside?
Proteoglycan
Cadherin
Fibronectin
Integrin
Which of the following is NOT true of gap junctions?
They allow inorganic ions and small water-soluble molecules to move directly between cells.
They allow ATP-driven pumps to move substances from one cell to another
They allow an electrical and a metabolic coupling between the cells. They may be opened or closed as needed.
In the extracellular matrix of animal tissues, which of the following molecules allows the matrix to resist compression?
. Integrin
Collagen
Fibronectin
Proteoglycans
Cadherin proteins:
create an electrical and metabolic coupling between epithelial cells
link epithelial cells together by binding to similar cadherins in adjacent epithelial cells.
allow ions and small molecules to pass from one plant cell to another.
anchor epithelial cells to the basal lamina.
Which type of epithelial junction plays a role in an epithelial sheet’s ability to develop tension or change its shape by contraction?
Desmosome
Gap junction
Tight junction
Adherens junction
Which is the toughest and most durable of the three types of cytoskeletal filaments?
Intermediate filaments
Microtubules
Actin Filaments
