_______ is a large protein that extends from Z line to M line in a sacromere and accounts for the passive tension response of a stretched muscle fiber.

A. myosin
B. titin
C. connexin
D. actin


Answer: D. actin

Biology & Microbiology

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Kelps require ____ substrates in order to grow

a. rocky b. muddy c. silty d. sandy e. porous

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The Y chromosome

A. is larger than the X chromosome. B. contains more genes than the X chromosome. C. is the same size as the X chromosome. D. is smaller than the X chromosome. E. is genetically identical to the X chromosome.

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If formerly interbreeding organisms are prevented from the production of fertile offspring, _____ has occurred

a) geographic isolation b) behavioral isolation c) physiological isolation d) reproductive isolation e) punctuated isolation

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All of the following are macromolecules EXCEPT

A) DNA B) cellulose C) glucose D) starch

Biology & Microbiology