Question 1

Which of the following terms is incorrectly matched with the word from which it was derived?

Accepted Answer

A) Z line-zwischen 
B) M line-myomesin 
C) H zone-hell 
D) I band-irregular 
E) A band-anisotropic

Question 2

Striated muscle has light and dark bands.The light bands are called ________,whereas the dark bands are called ________.

Accepted Answer

A) Z lines; M lines 
B) H zones; M zones 
C) A bands; I bands 
D) I bands; A bands 
E) M lines; A bands

Question 3

In order for a cell to crawl,it must produce a protrusion at the front of the cell (leading edge).One type of protrusion is a thin sheet called a(n)________; another is a pointed structure called a(n)________.

Accepted Answer

The answer of In order for a cell to crawl,it...

Question 4

Match between columns
                        Premises: A tubule
B tubule
sidearms
nexin
radial spokes

Accepted Answer

The Answer of incomplete microtubule and project inward at each is...

Question 5

In the axoneme,sidearms

Accepted Answer

A) are incomplete microtubules. 
B) slide microtubules past one another. 
C) project inward at each doublet. 
D) link adjacent doublets. 
E) are complete microtubules.

Question 6

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

Accepted Answer

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

Question 7

All of the following are examples of nonmuscle motility and contractility except

Accepted Answer

A) microsome formation. 
B) pseudopodia formation. 
C) cytoplasmic streaming. 
D) actin polymerization of Listeria. 
E) phagocytosis.

Question 8

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

Accepted Answer

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

Question 9

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

Question 10

Axonemal dynesin is characterized by

Accepted Answer

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

Question 11

Muscle contraction occurs in a cyclic process.Which of the following sequences is in the correct order?

Accepted Answer

A) power stroke, cross bridge formation, cross bridge dissociation, cocking of myosin 
B) cross bridge formation, power stroke, cross bridge dissociation, cocking of myosin 
C) cross bridge formation, cocking of myosin, power stroke, cross bridge dissociation 
D) cross bridge formation, cross bridge dissociation, cocking of myosin, power stroke 
E) cross bridge formation, power stroke, cross bridge dissociation, power stroke, cocking of myosin

Question 12

Calcium-calmodulin complexes ultimately mediate the phosphorylation of myosin in which of the following cells?

Accepted Answer

A) smooth muscle 
B) cardiac muscle 
C) neurons 
D) pacemaker 
E)  skeletal muscle

Question 13

Which of the following lists of structures is in the correct order from inside to outside of the cell?

Accepted Answer

A) axoneme, transition zone, basal body 
B) transition zone, basal body, axoneme 
C) axoneme, basal body, transition zone 
D) basal body, transition zone, axoneme 
E) basal body, axoneme, transition zone

Question 14

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

Question 15

Dyneins are

Accepted Answer

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

Question 16

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

Accepted Answer

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

Question 17

Kinesin is a motor molecule that is characterized by

Accepted Answer

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

Question 18

Primary cilia have a ________ structure and are observed in ________ structures.

Accepted Answer

A) 9 + 2; neural 
B) 9 + 0; neural 
C) 9 + 2; sensory 
D) 9 + 0; sensory 
E) 9 + 4; developmental

Question 19

Cilia and flagella are comprised of a(n)________ connected to a(n)________.

Accepted Answer

The answer of Cilia and flagella are comprised of a(n)________...

Question 20

After death,the lack of ATP stops the dissociation of cross-bridges,and the muscle is locked in a stiff,rigid state called ________.

Accepted Answer

The answer of After death,the lack of ATP stops the...

Exam 16: Cellular Movement: Motility and Contractility