Question 1

Cyclosis (cytoplasmic streaming)is driven by ________ that interact with ________ that are anchored to chloroplasts near an algal cell wall.

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Question 2

In the T-tubule triad structure seen in electron micrographs of striated muscle,the T tubule is flanked by two terminal cisternae of the ________.This association facilitates opening terminal cisternae ryanodine receptors,which ________ to initiate sarcomere contraction.

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The answer of In the T-tubule triad structure seen in...

Question 3

Eukaryotic motile cilia and flagella have similar structures but vary in number,length,and function.For each of the following,compare/contrast cilia and flagella.
a.number present per cell
b.length of appendage
c.direction of force generated relative to the direction of the appendage
d.function in unicellular and multicellular eukaryotes
e.motion analogy

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Question 4

________ is the process that moves tubulin subunits to the flagellar tip where they assemble onto axonemal microtubules.

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Question 5

Crawling cells produce broad,thin protrusions known as ________ and pointed structures called ________ at the leading edge of the cell.

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Question 6

Name each of the three polypeptides of troponin chains and identify what each binds to.
________ binds to ________
________ binds to ________
________ binds to ________

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Question 7

You identify a protein that may play a role in microtubule-based transport.Propose a series of experiments that would aid you in confirming your assessment that this protein has a role in microtubule-based transport.

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Question 8

________ is a directional movement in response to a graded chemical stimulus.

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Question 9

The ________ element of the sarcoplasmic reticulum is where ________ function to decrease sarcoplasmic Ca2⁺ concentration for muscle relaxation.

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Question 10

The contractile ________ are aligned in ________ and ________ striated muscles but not in ________ muscles.

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Question 11

Striated muscle myofibrils are end-to-end associations of the fundamental contractile units of the muscle cell known as ________.

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Question 12

When migrating cells move toward a greater concentration of a diffusible chemical,the chemical is called a ________.

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Question 13

Mutations in myosin V cause a human disorder known as ________,involving partial albinism and neurological defects.

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Question 14

Rigor mortis after death is caused by myosin crossbridges that fail to dissociate from the actin thin filaments because of lack of ________.

Accepted Answer

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Question 15

The structural organization of muscle fibers makes it possible to produce contractile force.
a.What is the fundamental contractile unit of skeletal muscle?
b.What are the names of the bands,lines and zone of the contractile unit of skeletal muscle?
c.Each of the contractile unit region names in (b)contains a letter.What does each of these letters stand for?
d.What changes occur in the contractile unit regions during contraction?

Accepted Answer

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Question 16

Consider the observations that a label on one head of a myosin V dimer moves in steps of 72 nm,but a label much nearer the myosin tail moves in steps of 36 nm.Discuss how these observations support a hand-over-hand mechanism rather than an inchworm mechanism of myosin V motility on an actin filament.

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Question 17

The ________ protein complex facilitates the interaction between cytoplasmic dynein,a cargo vesicle,and a microtubule.

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Question 18

The tetanus toxin tetanospasmin blocks release of the neurotransmitter (GABA)that inhibits motor neurons and decreases muscle contraction.This causes persistence of the signal to contract and the resulting violent muscle contraction known as tetanic spasm.Compare the sustained contraction of muscle cells in rigor mortis with muscle contraction caused by the action of tetanospasmin on motor neurons.

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Question 19

Myosin II is ideally suited for muscle contraction because it forms ________ filaments.

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Question 20

Microtubule motors ________ move vesicles toward the minus end of a microtubule.

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Quiz 14: Cellular Movement: Motility and Contractility

Cyclosis (cytoplasmic streaming)is driven by that interact with that are anchored to chloroplasts near an algal cell wall.

In the T-tubule triad structure seen in electron micrographs of striated muscle,the T tubule is flanked by two terminal cisternae of the .This association facilitates opening terminal cisternae ryanodine receptors,which to initiate sarcomere contraction.

________ is the process that moves tubulin subunits to the flagellar tip where they assemble onto axonemal microtubules.

Crawling cells produce broad,thin protrusions known as and pointed structures called at the leading edge of the cell.

Name each of the three polypeptides of troponin chains and identify what each binds to. binds to binds to binds to

You identify a protein that may play a role in microtubule-based transport.Propose a series of experiments that would aid you in confirming your assessment that this protein has a role in microtubule-based transport.

________ is a directional movement in response to a graded chemical stimulus.

The element of the sarcoplasmic reticulum is where function to decrease sarcoplasmic Ca2⁺ concentration for muscle relaxation.

The contractile are aligned in and striated muscles but not in muscles.

Striated muscle myofibrils are end-to-end associations of the fundamental contractile units of the muscle cell known as ________.

When migrating cells move toward a greater concentration of a diffusible chemical,the chemical is called a ________.

Mutations in myosin V cause a human disorder known as ________,involving partial albinism and neurological defects.

Rigor mortis after death is caused by myosin crossbridges that fail to dissociate from the actin thin filaments because of lack of ________.

The ________ protein complex facilitates the interaction between cytoplasmic dynein,a cargo vesicle,and a microtubule.

Myosin II is ideally suited for muscle contraction because it forms ________ filaments.

Microtubule motors ________ move vesicles toward the minus end of a microtubule.

Quiz 14: Cellular Movement: Motility and Contractility

Cyclosis (cytoplasmic streaming)is driven by ________ that interact with ________ that are anchored to chloroplasts near an algal cell wall.

In the T-tubule triad structure seen in electron micrographs of striated muscle,the T tubule is flanked by two terminal cisternae of the ________.This association facilitates opening terminal cisternae ryanodine receptors,which ________ to initiate sarcomere contraction.

________ is the process that moves tubulin subunits to the flagellar tip where they assemble onto axonemal microtubules.

Crawling cells produce broad,thin protrusions known as ________ and pointed structures called ________ at the leading edge of the cell.

Name each of the three polypeptides of troponin chains and identify what each binds to. ________ binds to ________ ________ binds to ________ ________ binds to ________

You identify a protein that may play a role in microtubule-based transport.Propose a series of experiments that would aid you in confirming your assessment that this protein has a role in microtubule-based transport.

________ is a directional movement in response to a graded chemical stimulus.

The ________ element of the sarcoplasmic reticulum is where ________ function to decrease sarcoplasmic Ca2+ concentration for muscle relaxation.

The contractile ________ are aligned in ________ and ________ striated muscles but not in ________ muscles.

Striated muscle myofibrils are end-to-end associations of the fundamental contractile units of the muscle cell known as ________.

When migrating cells move toward a greater concentration of a diffusible chemical,the chemical is called a ________.

Mutations in myosin V cause a human disorder known as ________,involving partial albinism and neurological defects.

Rigor mortis after death is caused by myosin crossbridges that fail to dissociate from the actin thin filaments because of lack of ________.

The ________ protein complex facilitates the interaction between cytoplasmic dynein,a cargo vesicle,and a microtubule.

Myosin II is ideally suited for muscle contraction because it forms ________ filaments.

Microtubule motors ________ move vesicles toward the minus end of a microtubule.

Cyclosis (cytoplasmic streaming)is driven by that interact with that are anchored to chloroplasts near an algal cell wall.

In the T-tubule triad structure seen in electron micrographs of striated muscle,the T tubule is flanked by two terminal cisternae of the .This association facilitates opening terminal cisternae ryanodine receptors,which to initiate sarcomere contraction.

Crawling cells produce broad,thin protrusions known as and pointed structures called at the leading edge of the cell.

Name each of the three polypeptides of troponin chains and identify what each binds to. binds to binds to binds to

The element of the sarcoplasmic reticulum is where function to decrease sarcoplasmic Ca2⁺ concentration for muscle relaxation.

The contractile are aligned in and striated muscles but not in muscles.