Bio 152 Final exam || Questions and 100% Verified Answers.
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Course
Bio 152
Institution
Bio 152
e. All of the choices are correct except for myosin correct answers 9. The thin filament in skeletal muscle contains _____ molecules.
a. actin
b. myosin
c. troponin
d. tropomyosin
e. All of the choices are correct except for myosin
a. actin, myosin correct answers 9. Cross-bridges form be...
Bio 152 Final exam || Questions and 100% Verified Answers.
e. All of the choices are correct except for myosin correct answers 9. The thin filament in
skeletal muscle contains _____ molecules.
a. actin
b. myosin
c. troponin
d. tropomyosin
e. All of the choices are correct except for myosin
a. actin, myosin correct answers 9. Cross-bridges form between _____ and _____ during
muscular contraction.
a. actin, myosin
b. actin, tropomyosin
c. myosin, troponin
d. myosin, tropomyosin
e. troponin, calmodulin
b. initiate changes in protein conformation that expose myosin-binding sites on actin. correct
answers 9. The role of Ca2+ in the control of muscle contraction is to
*a.* cause depolarization of the T tubule system.
*b.* initiate changes in protein conformation that expose myosin-binding sites on actin.
*c.* change the conformation of myosin heads, thus causing microfilaments to slide past each
other.
*d.* bind to tropomyosin and break actin-myosin cross-bridges.
*e.* block the ATP-binding site on myosin heads, enabling muscles to relax.
a. It stores Ca2+ ions for release during contraction. correct answers 9. What is the role of the
sarcoplasmic reticulum in muscle contraction?
a. It stores Ca2+ ions for release during contraction.
b. It surrounds and protects the muscle filaments.
c. It provides sites of ATP synthesis.
d. It depolarizes when stimulated by an impulse.
e. It synthesizes actin and myosin filaments.
e. insects and crustaceans correct answers 9. Exoskeletons are used for movement by which of
the following animals?
a. insects
b. cnidarians
c. crustaceans
d. humans
,e. insects and crustaceans
e. Myosin heads have ATPase activity and interact with actin. correct answers 9. Which
statement about a myosin filament in skeletal muscle is true?
a. A thick filament consists of actin and myosin.
b. Myosin filaments consist of linear troponin molecules attached to tropomyosin heads.
c. Troponin binds to the head of the myosin molecule.
d. Myosin activity is regulated by tropomyosin, which binds to myosin tails.
e. Myosin heads have ATPase activity and interact with actin.
e. actin and myosin cannot separate without ATP. correct answers 9. When animals die, muscles
stiffen in rigor mortis because
a. muscles cannot contract without ATP.
b. actin and myosin cannot bind without ATP.
c. ATP is required for synthesis of protein filaments.
d. ATP forms cross-bridges between filaments.
e. actin and myosin cannot separate without ATP.
a. they form from fusion of many embryonic stem cells. correct answers 9. Skeletal muscle cells
are multinucleate because
a. they form from fusion of many embryonic stem cells.
b. they need to be large to absorb their metabolic waste.
c. the nucleus of the skeletal precursor cell undergoes mitosis many times in the absence of
cytokinesis to create the muscle cell.
d. the many nuclei provide the large amounts of ATP these cells need.
e. the many nuclei store the large amounts of glycogen these cells use.
d. adenosine triphosphate (ATP). correct answers 9. *Release* of cross-bridges depends most
directly on
a. calcium ions.
b. potassium ions.
c. adenosine diphosphate (ADP).
d. adenosine triphosphate (ATP).
e. creatine phosphate.
a. exoskeleton correct answers 9. Which of the following types of skeletons must be shed
typically for an animal to grow?
a. exoskeleton
b. endoskeleton
c. hydrostatic skeleton
d. All choices are correct.
, e. None of the choices are correct.
b. Are involuntary correct answers 9. Smooth muscle and cardiac muscle cells differ from
skeletal muscle because they:
a. Are striated
b. Are involuntary
c. Do not contain thick filaments
d. Do not contain thin filaments
e. Are voluntary
b. myosin correct answers 9. Which of the following proteins contains an ATP binding site?
a. actin
b. myosin
c. troponin
d. tropomyosin
e. All of the choices are correct
a. calcium, troponin correct answers 9. In muscle function at the sarcomere level, the binding of
___ ions to ____ regulates the formation of cross-bridges.
a. calcium, troponin
b. calcium, tropomyosin
c. calcium, myosin
d. sodium, troponin
e. sodium, tropomyosin
a. The muscles are attached to a living support structure. correct answers 9. Which statement
about the endoskeletons of vertebrates is true?
a. The muscles are attached to a living support structure.
b. Endoskeletons are inert systems.
c. Molting is necessary in animals with endoskeletons.
d. Endoskeletons consist of chitin containing calcium.
e. At least one skeletal structure is required to form a joint.
a. sarcoplasmic reticulum. correct answers 9. The primary reservoir for calcium that is released
during excitation-contraction coupling in a skeletal muscle fiber is
a. sarcoplasmic reticulum.
b. endoplasmic reticulum.
c. transverse tubules.
d. Golgi bodies.
e. troponin.
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