Question 1

In relaxed muscle, calcium is found in high concentration in the

Accepted Answer

A) myofibril. 
B) T tubules. 
C) neuromuscular junction. 
D) sarcolemma. 
E) sacroplasmic reticulum. 
A) myofibril. 
B) T tubules. 
C) neuromuscular junction. 
D) sarcolemma. 
E) sacroplasmic reticulum. E

Question 2

Cytological examination of resting and contracted muscle provides important support for our current model for how skeletal muscle contracts. This evidence includes the observation that during contraction the

Accepted Answer

A) muscle fibers change color. 
B) Z lines move farther apart. 
C) microtubules disassemble. 
D) length of the thick and thin filaments change significantly. 
E) H zone becomes smaller. 
A) muscle fibers change color. 
B) Z lines move farther apart. 
C) microtubules disassemble. 
D) length of the thick and thin filaments change significantly. 
E) H zone becomes smaller. E

Question 3

The neuromuscular junction is incorrectly described in which of the following statements?

Accepted Answer

A) Neurotransmitters are stored in vesicles in the axon terminal. 
B) Acetylcholine binding allows sodium ions to enter the muscle cell. 
C) Acetylcholine binds receptors in the synaptic cleft. 
D) The sarcolemma is the plasma membrane of a muscle cell. 
E) T tubules carry action potentials into the muscle cell. 
A) Neurotransmitters are stored in vesicles in the axon terminal. 
B) Acetylcholine binding allows sodium ions to enter the muscle cell. 
C) Acetylcholine binds receptors in the synaptic cleft. 
D) The sarcolemma is the plasma membrane of a muscle cell. 
E) T tubules carry action potentials into the muscle cell. C

Question 4

In the sliding filament model of muscle contraction, I bands contain

Accepted Answer

A) myosin. 
B) sacrcomeres. 
C) both thick and thin filaments. 
D) thin filaments. 
E) thick filaments. 
A) myosin. 
B) sacrcomeres. 
C) both thick and thin filaments. 
D) thin filaments. 
E) thick filaments.

Question 5

In the axoneme, nexin

Accepted Answer

A) slides microtubules past one another. 
B) links adjacent doublets. 
C) projects inward at each doublet. 
D) is a complete microtubule. 
E) is an incomplete microtubule. 
A) slides microtubules past one another. 
B) links adjacent doublets. 
C) projects inward at each doublet. 
D) is a complete microtubule. 
E) is an incomplete microtubule.

Question 6

Which of the following statements is correct with respect to flagella and cilia?

Accepted Answer

A) Cilia generate a force parallel to the cell surface. 
B) There are usually fewer cilia than flagella. 
C) Cilia often have a helical pattern of movement. 
D) Cilia are generally longer than flagella. 
E) Flagella display an oarlike pattern of beating. 
A) Cilia generate a force parallel to the cell surface. 
B) There are usually fewer cilia than flagella. 
C) Cilia often have a helical pattern of movement. 
D) Cilia are generally longer than flagella. 
E) Flagella display an oarlike pattern of beating.

Question 7

In addition to microtubule motor proteins, are also involved in vesicular transport.

Accepted Answer

A) actin 
B) leptin 
C) non- muscle myosins 
D) dyesins 
E) tubulin 
A) actin 
B) leptin 
C) non- muscle myosins 
D) dyesins 
E) tubulin

Question 8

Which of the following sequences of skeletal muscle proteins is correctly listed from smallest to largest?

Accepted Answer

A) myomesin, myosin, titin, nebulin 
B) actin, myosin, nebulin, titin 
C) actin, myosin, titin, troponin 
D) titin, nebulin, actin, myosin 
E) actin, titin, nebulin, myosin 
A) myomesin, myosin, titin, nebulin 
B) actin, myosin, nebulin, titin 
C) actin, myosin, titin, troponin 
D) titin, nebulin, actin, myosin 
E) actin, titin, nebulin, myosin

Question 9

A calcium- binding protein that aids in the activation of many enzymes, including myosin light- chain kinase, is

Accepted Answer

A) junctional complex. 
B) calcium phosphorylase. 
C) myosin light- chain phosphatase. 
D) activase. 
E) calmodulin. 
A) junctional complex. 
B) calcium phosphorylase. 
C) myosin light- chain phosphatase. 
D) activase. 
E) calmodulin.

Question 10

Cells that undergo amoeboid movement have an outer layer of thick, gelatinous cytoplasm called the , and an inner layer of more- fluid cytoplasm called the .

Accepted Answer

A) ectoplasm; endoplasm 
B) lamellipodium; pseudopodium 
C) outer jelly; inner soup 
D) protoplasm; proplasm 
E) gelation layer; solation zone 
A) ectoplasm; endoplasm 
B) lamellipodium; pseudopodium 
C) outer jelly; inner soup 
D) protoplasm; proplasm 
E) gelation layer; solation zone

Question 11

The crawling displayed by many embryonic cells in animals involves distinct events. Which of the following sequences places these events in correct order?

Accepted Answer

A) release and retraction of protrusion, protrusion at the cell's leading edge, attachment of trailing edge, pulling the cell forward 
B) pulling the cell forward, release and retraction of protrusion, protrusion at the cell's leading edge, attachment of trailing edge 
C) attachment of protrusion, protrusion at the cell's leading edge, pulling the cell forward, release and retraction of trailing edge 
D) attachment of protrusion, pulling the cell forward, protrusion at the cell's leading edge, release and retraction of trailing edge 
E) protrusion at the cell's leading edge, attachment of protrusion, pulling the cell forward, release and retraction of trailing edge 
A) release and retraction of protrusion, protrusion at the cell's leading edge, attachment of trailing edge, pulling the cell forward 
B) pulling the cell forward, release and retraction of protrusion, protrusion at the cell's leading edge, attachment of trailing edge 
C) attachment of protrusion, protrusion at the cell's leading edge, pulling the cell forward, release and retraction of trailing edge 
D) attachment of protrusion, pulling the cell forward, protrusion at the cell's leading edge, release and retraction of trailing edge 
E) protrusion at the cell's leading edge, attachment of protrusion, pulling the cell forward, release and retraction of trailing edge

Question 12

Dyneins are

Accepted Answer

A) monomeric myosin- like proteins. 
B) associated with organelle movement. 
C) responsible for anterograde transport. 
D) associated with cilia and flagella. 
E) all of the above 
A) monomeric myosin- like proteins. 
B) associated with organelle movement. 
C) responsible for anterograde transport. 
D) associated with cilia and flagella. 
E) all of the above

Question 13

Kinesin is a motor molecule that is characterized by

Accepted Answer

A) motion along actin filaments. 
B) sliding along actin in sarcomere. 
C) motion toward the "plus" end of the microtubule. 
D) motion toward the "minus" end of the microtubule. 
E) activation of sliding in flagellar microtubules. 
A) motion along actin filaments. 
B) sliding along actin in sarcomere. 
C) motion toward the "plus" end of the microtubule. 
D) motion toward the "minus" end of the microtubule. 
E) activation of sliding in flagellar microtubules.

Question 14

Biochemical evidence supporting our current model of muscle contraction includes the observation that

Accepted Answer

A) actin and myosin have the same molecular weight. 
B) myosin has ATPase activity. 
C) myosin binds calcium. 
D) titin binds calcium. 
E) actin has ATPase activity. 
A) actin and myosin have the same molecular weight. 
B) myosin has ATPase activity. 
C) myosin binds calcium. 
D) titin binds calcium. 
E) actin has ATPase activity.

Question 15

The protein complex facilitates the interaction between cytoplasmic dynein and the target.

Accepted Answer

The answer of The protein complex facilitates the interaction between...

Question 16

You wish to inhibit the contraction of muscle in vitro as a control for an experiment you are conducting. To do this, which of the following would you use?

Accepted Answer

A) ATPase inhibitors 
B) dyneinase 
C) serotonin 
D) mysoinase II 
E) contractionase 
A) ATPase inhibitors 
B) dyneinase 
C) serotonin 
D) mysoinase II 
E) contractionase

Question 17

To carry out their function, kinesin family proteins must attach to their respective

Accepted Answer

A) dynein. 
B) cargo. 
C) adaptor proteins. 
D) only B and C 
E) A, B, and C 
A) dynein. 
B) cargo. 
C) adaptor proteins. 
D) only B and C 
E) A, B, and C

Question 18

The microtubule- associated protein provides motion toward the minus end of the microtubule.

Accepted Answer

The answer of The microtubule- associated protein provides motion toward...

Question 19

Sidearms are attached to .

Accepted Answer

A) interdoublet nexin 
B) central pairs 
C) B tubules 
D) radial spokes 
E) A tubules 
A) interdoublet nexin 
B) central pairs 
C) B tubules 
D) radial spokes 
E) A tubules

Question 20

Which of the following changes take place as the muscle contracts?

Accepted Answer

A) H zones get smaller. 
B) Z lines get closer together. 
C) I band gets smaller. 
D) A band gets smaller. 
E) choices A, B, and C 
A) H zones get smaller. 
B) Z lines get closer together. 
C) I band gets smaller. 
D) A band gets smaller. 
E) choices A, B, and C

Exam 16: Cellular Movement: Motility and Contractility

In relaxed muscle, calcium is found in high concentration in the

Cytological examination of resting and contracted muscle provides important support for our current model for how skeletal muscle contracts. This evidence includes the observation that during contraction the

The neuromuscular junction is incorrectly described in which of the following statements?

In the sliding filament model of muscle contraction, I bands contain

In the axoneme, nexin

Which of the following statements is correct with respect to flagella and cilia?

In addition to microtubule motor proteins, are also involved in vesicular transport.

Which of the following sequences of skeletal muscle proteins is correctly listed from smallest to largest?

A calcium- binding protein that aids in the activation of many enzymes, including myosin light- chain kinase, is

Cells that undergo amoeboid movement have an outer layer of thick, gelatinous cytoplasm called the , and an inner layer of more- fluid cytoplasm called the .

The crawling displayed by many embryonic cells in animals involves distinct events. Which of the following sequences places these events in correct order?

Dyneins are

Kinesin is a motor molecule that is characterized by

Biochemical evidence supporting our current model of muscle contraction includes the observation that

The protein complex facilitates the interaction between cytoplasmic dynein and the target.

You wish to inhibit the contraction of muscle in vitro as a control for an experiment you are conducting. To do this, which of the following would you use?

To carry out their function, kinesin family proteins must attach to their respective

The microtubule- associated protein provides motion toward the minus end of the microtubule.

Sidearms are attached to .

Which of the following changes take place as the muscle contracts?

A Preview of the Cell

The Chemistry of the Cell

The Macromolecules of the Cell

Cells and Organelles

Bioenergetics: The Flow of Energy in the Cell

Enzymes: The Catalysts of Life

Membranes: Their Structure, Function, and Chemistry

Transport Across Membranes: Overcoming the Permeability Barrier

Chemotrophic Energy Metabolism: Glycolysis and Fermentation

Chemotrophic Energy Metabolism: Aerobic Respiration

Phototrophic Energy Metabolism: Photosynthesis

The Endomembrane System and Peroxisomes

Signal Transduction Mechanisms: I Electrical and Synaptic Signaling in Neurons

Signal Transduction Mechanisms: Ii Messengers and Receptors

Cytoskeletal Systems

Beyond the Cell: Cell Adhesion, Cell Junctions, and Extracellular Structures

The Structural Basis of Cellular Information: DNA, Chromosomes, and the Nucleus

The Cell Cycle, Dna Replication, and Mitosis

Sexual Reproduction, Meiosis, and Genetic Recombination

Gene Expression: I the Genetic Code and Transcription

Gene Expression: II Protein Synthesis and Sorting

The Regulation of Gene Expression

Cancer Cells

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