Question 1

Tubulin subunits are added to growing cilia or flagella by ________.

Accepted Answer

The answer of Tubulin subunits are added to growing cilia...

Question 2

Which of the following major protein components of skeletal muscle is incorrectly matched with its function?

Accepted Answer

A) titin-links thick filaments at Z line 
B) nebulin-links thin filaments at Z line 
C) myomesin-myosin binding protein present at M line 
D) troponin-binds along the length of the thin filaments and covers myosin binding sites 
E) actin-major component of thin filaments

Question 3

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.

Accepted Answer

The answer of You identify a protein that may play...

Question 4

Troponin is a complex of three polypeptide chains called ________,________,and ________.

Accepted Answer

The answer of Troponin is a complex of three polypeptide...

Question 5

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

Question 6

Mutations in myosin VII result in an autosomal recessive disorder called ________ ,which is characterized by congenital profound hearing loss,problems in the vestibular system,and retinitis pigmentosum.

Accepted Answer

The answer of Mutations in myosin VII result in an...

Question 7

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

Accepted Answer

A) nonmuscle myosins 
B) actin 
C) tubulin 
D) leptin 
E) dyesins

Question 8

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

Accepted Answer

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

Question 9

During the sliding process in microtubules,the stalks of the dynein attach to and detach from the ________ in a cyclic manner.

Accepted Answer

A) A tubule 
B) B tubule 
C) radial spoke 
D) interdoublet nexin connections 
E) central pair

Question 10

Discuss how stereocilia work in the organ of Corti and how some chemotherapeutic agents and aminoglycoside antibiotics result in deafness.

Accepted Answer

The answer of Discuss how stereocilia work in the organ...

Question 11

Compare the sustained contraction of muscle cells in rigor mortis with that which results from the action of tetanospasmin (tetanus toxin)on motor neurons.

Accepted Answer

The answer of Compare the sustained contraction of muscle cells...

Question 12

All of the following diseases are classified as ciliopathies except

Accepted Answer

A) Kartagener's triad. 
B) BardetBieldl syndrome. 
C) MeckelGruber syndrome. 
D) Griscelli's disease. 
E) polycystic kidney disease.

Question 13

The ________ account for 1015% of microtubules.

Accepted Answer

The answer of The ________ account for 1015% of microtubules....

Question 14

During cell crawling,the cell must attach to the substrate upon which it is crawling.One group of attachment proteins is the ________.

Accepted Answer

A) actins 
B) actomyosins 
C) creatines 
D) integrins 
E) titins

Question 15

The calcium pump or calcium ATPase

Accepted Answer

A) is responsible for removing calcium from the T tubule. 
B) increases the level of calcium in the axon terminal. 
C) is a passive process. 
D) removes calcium from the sarcoplasm. 
E) increases bone density.

Question 16

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

Accepted Answer

The answer of ________ is a directional movement in response...

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 choices B and C 
E) choices A, B, and C

Question 18

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

Accepted Answer

The answer of When migrating cells move toward a greater...

Question 19

All of the following are actin-dependent nonmuscle motility except

Accepted Answer

A) translocation of multienzyme complexes. 
B) pinching off of the cleavage furrow in cytokinesis. 
C) chemotaxis. 
D) cyclosis or cytoplasmic streaming. 
E) amoeboid movement.

Question 20

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

Exam 16: Cellular Movement: Motility and Contractility