The "motor" protein of muscle sarcomeres is: |
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A) |
actin. |
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B) |
kinesin. |
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C) |
alpha tubulin. |
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D) |
dynein. |
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E) |
type II myosin. |
The "motor" protein of muscle sarcomeres is: A) actin. B) kinesin. C) alpha tubulin. D) dynein....
Motor proteins associated with tubulin include (more than one is correct; mark all correct choices) A. myosin B. kinesin C. none known D. dynein
CELL BIOLOGY Consider three types of molecular motor proteins: kinesin 1, cytoplasmic dynein, myosin II. First, make a list of several properties and functions that these proteins have in common, and then second, make a list of ways that these proteins differ from each other. When considered together, your lists should provide a summary of the roles of these proteins in cellular motility.
1) You are investigating the force generated by the sarcomeres in a myofibril of a muscle. Let's assume you have a way of quantifying the number of actin-myosin cross bridges. You notice that for all of your sarcomeres, increasing the number of actin-myosin crossbridges does not increase the force generated by the sarcomere. What is going on? A) The sarcomeres are too contracted, hence sarcomere length is a limiting factor for force generated rather than the number of cross-bridges...
(15). Muscle cells contain , which are composed of thin filaments made of ts made ofarranged as thousands of . Myosin is a motor protein that moves towards the WWwe end of actin. and eNN Calcium is stored in specialized endoplasmic reticulum called released in response to depolarization of the . Calcium binds to MMMN , uncovering the myosin binding which results in a conformational change in sites on actin. Binding of ATP to myosin causes the hydrolysis of ATP...
Which one of the following proteins is an extracellular protein? a. vinculin b. laminin c. dynamin d. lamin e. tubulin The phenomenonon of rigor mortis occurs due to: a. Inactivation of the Ca++ pump b. Discontinuation of ATP production c. Inability of myosin to release actin d. All of the above e. Onlyaandc
In muscle that must move very quickly, and perform very precise, skilled movements (muscles of the hand, muscles of the eyes), which type of muscle fiber will predominate? a. slow oxidative b. fast oxidative c. fast glycolytic In contraction in a muscle fiber, when one looks closely at the protein filaments in the sarcomere, what is happening to the actin and myosin filaments when contraction occurs? a. the sarcomere is shortening, because the amount of overlap between actin and myosin...
Match Protein & Function
1. Match PROTEIN to actin, myosin antibodies calcium binding protein collagen hemoglobin lipoproteins plasma proteins transferrin FUNCTION a. transport (calcium) b. transport (oxygen) c. transport (iron) d. transport (lipids) and fat soluble vitamins e. maintain osmotic pressure f. structure of muscle g. cell cement, ligaments h. fight disease
The lever arm hypothesis for muscle arm contraction posits that actin sliding velocity should be proportional to the myosin lever arm length. A wild-type myosin lever arm is 80 Å and generates an actin sliding velocity of 2.5 μm/s. You generate a myosin mutant with 42 amino acids deleted, resulting in a lever arm of 60 Å. You measure the resulting actin sliding velocity to be 1.875 μm/s. Based on the lever arm hypothesis, what actin sliding velocity should you...
Name: PRACTICE EXAM 1 - Cell Biology Spring 2020 MULTIPLE CHOICE (5 points each, 100 points total). Choose the one alternat. completes the statement or answers the question. 1) Leeuwenhoek's simple home-made microscope had a numerical aperture (NA) of anproximately 0.6. Using light with a wavelength of 500 nm, about what was in resolution limit (R) of this microscope? a) 500 pm b) 5 pm c) 0.5 pm d) 5 nm e) 0.6 pm CH,DH 2) This polymeric macromolecule is:...
Which of the following statements is false?
Q 17-7 Homework Unanswered. Due in a day Which statement is FALSE? A Kinesins would be likely to move cargoes along microtubules toward the periphery of the cell o B A dynein would be the most likely motor protein to deliver a signal from the cell periphery to the nucleus O C Myosin I can control cell shape by pulling the plasma membrane along actin filaments D M yosin II promotes flagella movement...