BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 4, Problem 4A
Different motor proteins like kinesin and myosin are similar in that they can
a. interact with microtubules.
b. use energy from ATP to produce movement.
c. interact with actin.
d. do both a and b.
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Which of the following statements best describes the sliding filament mechanism of muscle contraction?
a. Actin and myosin filaments do not shorten, but rather, slide past each other.
b. Actin and myosin filaments shorten and slide past each other.
c. As they slide past each other, actin filaments shorten, but myosin filaments do not shorten.
d. As they slide past each other, myosin filaments shorten, but actin filaments do not shorten.
When a skeletal muscle cell contracts and the muscle shortens,
a. the position of an actin molecule relative to a myosin molecule does not change.
b. myosin heads generate a single power stroke.
c. the actin ATPase allows the actin molecule to swivel.
d. the actin molecule swivels during the power stroke
e. some myosin heads are forming crossbridges as others are releasing them.
Which of the following statements is true of the chameleon tongue but not of the human tongue?
A. It is a muscular hydrostat.
B. Force generation reflects the binding of myosin crossbridges to actin thin filaments.
C. The organization of the actin and myosin filaments produces a regular pattern of bands, or
striations.
D. Gaps or holes in the Z-discs allow supercontraction (shortening beyond the normal limit).
E. All of the above statements are true of both the chameleon tongue and the human tongue.
Chapter 4 Solutions
BIOLOGY
Ch. 4.1 - Discuss the cell theory.Ch. 4.1 - Describe the factors that limit cell size.Ch. 4.1 - Prob. 3LOCh. 4.2 - Describe the organization of prokaryotic cells.Ch. 4.2 - Prob. 2LOCh. 4.3 - Prob. 1LOCh. 4.3 - Prob. 2LOCh. 4.3 - Prob. 3LOCh. 4.4 - Prob. 1LOCh. 4.4 - Contrast the different functions of internal...
Ch. 4.4 - Prob. 3LOCh. 4.5 - Describe the structure of mitochondria and...Ch. 4.5 - Compare the function of mitochondria and...Ch. 4.5 - Prob. 3LOCh. 4.6 - Contrast the structure and function of different...Ch. 4.6 - Prob. 2LOCh. 4.7 - Prob. 1LOCh. 4.7 - Prob. 2LOCh. 4.7 - Prob. 3LOCh. 4.8 - Prob. 1LOCh. 4.8 - Prob. 2LOCh. 4 - Prob. 1IQCh. 4 - Prob. 2IQCh. 4 - Prob. 3IQCh. 4 - Which of the following statements is NOT part of...Ch. 4 - All cells have all of the following except a....Ch. 4 - Eukaryotic cells are more complex than prokaryotic...Ch. 4 - Which of the following are differences between...Ch. 4 - The cytoskeleton includes a. microtubules made of...Ch. 4 - The smooth endoplasmic reticulum is a. involved in...Ch. 4 - Plasmodesmata in plants and gap junctions in...Ch. 4 - The most important factor that limits the size of...Ch. 4 - All eukaryotic cells possess each of the following...Ch. 4 - Adherens junctions, which contain cadherin, are...Ch. 4 - Different motor proteins like kinesin and myosin...Ch. 4 - The protein sorting pathway involves the following...Ch. 4 - Chloroplasts and mitochondria have many common...Ch. 4 - Prob. 7ACh. 4 - The smooth endoplasmic reticulum is the site of...Ch. 4 - Use the information provided in table 4.3 to...Ch. 4 - Prob. 3SCh. 4 - The protist Giardia intestinalis is the organism...
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- Rigor mortis occurs following death because a. tropomyosin remains over the myosin binding sites of actin. b. myosin heads attach to actin and are not released due to lack of ATP. c. the myosin becomes misshapen. d. all of the Ca2+ remains within the sarcoplasmic reticulum.arrow_forwardActin and myosin are long-filament proteins used in the contraction of muscles. They are examples of ________ proteins. A. Fibrous B. globular C. conjugated D. regulatoryarrow_forwardThe functions of tropomyosin in skeletal muscle include A. releasing calcium ions after initiation of contraction. B. generating ATP which it passes to the contractile mechanism. C. binding to myosin during contraction. D. acting as a relaxing protein at rest by covering up the sites where myosin binds to actin. E. sliding on actin to produce shortening.arrow_forward
- Which of the following thin filament structures directly interacts with the myosin heads to form a cross bridge? a. Myosin b. Troponin c. Tropomyosin d. F actin e. G actinarrow_forwardWhat do skeletal muscle contractions share in common with smooth muscle contractions?a. Both types of contractions do not require calcium ions for a contraction to occur.b. Both types of contractions generate little force or a weak force.c. Both types of contractions consume very little ATP.d. Both types of contractions result from thick and thin filaments sliding past one another.arrow_forwardA mutation has occurred that prevents ATP from binding from the heads of myosin. What impact would this have (if any) on human muscle contraction? Select one: a. ATP has no impact on myosin binding. Myosin, unlike kinesins, works with GTP. b. Without ATP, myosin will be stuck to microfilaments, causing muscles to be “stuck” in whatever position they were last in. c. Without ATP, myosin will not be able to bind to microtubules and move vesicles or chromosomes around the cell resulting in cell death. d. Without ATP, myosin will be stuck to intermediate filaments “locking” organelles in place in the cell.arrow_forward
- When sarcomeres contract during muscle contraction, which of the following occurs? A. The myosin filaments lengthen. B. The myosin filaments "walk" along the actin microfilaments. C. The myosin filaments shorten. D. The actin filaments shorten.arrow_forwardWhat is the role of ATP in muscle function? a. ATP provides energy that enables myosin to form cross bridges with actin. b. ATP enables myosin to detach from actin. c. ATP provides energy to transport calcium back into storage. d. all of the abovearrow_forwardThe Sarcomere 2 Thin filaments are often named for which protein? a. actin b. myosin c. troponin d. tropomyosinarrow_forward
- The actin myosin bond is broken by the attachment of A. Tropomyosin B. Phosphate C. ATP D. ADParrow_forwardThe sliding filament mechanism describes the process during which: a. actin and myosin slide relative to each other b. sarcomeres slide relative to each other c. troponin and tropomyosin slide relative to each other d. muscle fibers slide past each otherarrow_forwardAs ADP and Ⓟ are released from a myosin head,a. actin filaments move toward the H band.b. a sarcomere shortens.c. myosin filaments pull toward the thin filaments.d. All of these are correct.arrow_forward
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