The main structural characteristic of myosin molecules is: Select one: a. A beta-barrel b. A Fab domain c. An alpha helix d. The zinc finger domain e. A beta sheet
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The main structural characteristic of myosin molecules is:
A beta-barrel
A Fab domain
An alpha helix
The zinc finger domain
A beta sheet
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- To design a drug that inhibits metastasis, which of the following strategies is the WORST idea? to disrupt cadherin complexes to inhibit Rho family proteins to inhibit ARP complex O to block myosin-based contractile structureNeurofilament proteins assemble into long, intermediate filaments , found in abundance running along the length of nerve cell axons. The C-terminal region of these proteins is an unstructured polypeptide, hundreds of amino acids long and heavily modified by the addition of phosphate groups. The term “polymer brush” has been applied to this part of the neurofilament. can you suggest why?Protein-X has a calcium (Ca²+)-binding regulatory subunit. Upon calcium (Ca²+) binding the protein changes its own conformation resulting in the conformation change of protein-Y. As a result of this calcium (Ca²+)-dependent protein-X mediated conformational change protein-Y exposes the myosin II head binding sites on the skeletal muscle actin filaments. Identify the protein-X and protein-Y from the following choices. O Protein-X: Troponin; Protein-Y: Tropomysosin O Protein-X: Tropomodulin; CapZ O Protein-X: Nebulin; Protein-Y: Titin Protein-X: Tropomysosin; Protein-Y: Tropomodulin
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- Imagine you need to move a large protein from one region in the cell to another. Which of the following proteins would be able to do this? Onuclease O myoglobin O kinesin Oligase O hemoglobin O myosinWhich of the following adapter proteins or protein pairs connects the actin filaments with the extracellular matrix? Ezrin Dystrophin/Dystroglycan complex Band 4.1/Glycophorin C O Band 3/Ankyrin < PreviousA healthy 32-year-old man lifts weights regularly as part of his workout. In one of his biceps muscle fibers at rest, the length of the I band is 1.0 μm and the A band is 1.5 μm. Contraction of that muscle fiber results in a 10% shortening of the length of the sarcomere. What is the length of the A band after the shortening produced by muscle contraction? Draw the sarcomere before and after contraction.
- Shown below is a peripheral glycoprotein which functions as receptor for hormones in animal cells. X and Y are specific amino acids in the protein while the rectangles shown is the saccharide that is N-linked to the protein at X. What is the most likely composition of X and Y of this membrane protein? A. X = asp, Y = gly B. X = gIN, Y = leu %3D C. X = ser, Y = ile %3D D. X = cys, Y = met E. X = asN, Y = hisWhat is one feature of fibrillar collagen that contributes to its strength? They form crosslinks between glycine and alanine residues on adjacent collagens. They form crosslinks between lysine and hydroxylysine residues on one collagen molecule. They form crosslinks between glycine and alanine residues on one collagen molecule. They form crosslinks between lysine and hydroxylysine residues on adjacent collagen molecules.A human gene called theCFTR gene (for cystic fibrosis transmembrane regulator) encodes aprotein that functions in the transport of chloride ions across the cellmembrane. Most people have two copies of a functional CFTR geneand do not have cystic fibrosis. However, a mutant version of the CFTRgene is found in some people. If a person has two mutant copies ofthe gene, he or she develops the disease known as cystic fibrosis. Arethe following descriptions of this disease related to genetics at themolecular, cellular, organism, or population level?A. People with cystic fibrosis have lung problems due to a buildupof thick mucus in their lungs.B. The mutant CFTR gene encodes a defective chloride transporter.C. A defect in the chloride transporter causes a salt imbalance inlung cells.D. Scientists have wondered why the mutant CFTR gene is relativelycommon. In fact, it is the most common mutant gene that causesa severe disease in persons of Northern European descent. Onepossible explanation why…
