145. Myosin binding sites are blocked by A) ropomyosin B) sugar c) collecting du

Question

145. Myosin binding sites are blocked by A) ropomyosin B) sugar c) collecting ducts D) water E) all of the above 146, Skulls develop fromtissue A) endodermal B) ectodermal c) mesodemal D) all of the above E) none of the ahove 147 The sliding filament hypothesis was by A) Huxley and Huxley B) Huxley and Wallace C) Wallace and Mendel D) Wallace and Gromit E) Key and Peele 148 Compact bone can be found A) at your cranium. B) in your ribs C) at the bone's core and ends. D) in the bone's mid region n?) on sale at Costco this month only 49 The Z-line of muscle A) forms the boundaries of sarcomeres. B) is made of actin. C) demarcates a zone of contraction. D) All of the above E) None of the above 150.Bone is important because it: A) stores calcium. 1B) provides structure C) it makes red blood cells. D) All of the above E) None of the above

Explanation / Answer

Answer=145] Myosin binding sites are blocked by

A]Tropomyosin

explaination- as troponin binds to actin ,the tropomyosin is positioned so it prevents the myosin heads from contracting actin,thus preventing contraction.

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146] Skulls developed from

B]Ectodermal tissue

explaination -followed by gastrulation a a section of ectoderm folds inward,creating a groove that closes and forms an isolated tube down the dorsal midsection of embryo.

and forms skull

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147]The sliding filament hypothesis was by

A] Huxley and Huxley

explaination-sliding filament theory explains the mechanism of muscle contraction and based on muscle proteins that slide past each other.

it was independently introduced in 1954 by 2 research teams,one consisting of Andrew F.Huxley and Rolf Niedergerke from the university of cambridge ,and other consisting of Hugh Huxley and Jean Hanson.

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