Exam 16: Cellular Movement: Motility and Contractility

Movement of animals is dependent on skeletal muscle.The ability of muscle to contract is dependent on the structural organization of muscle fibers. a. What is the fundamental contractile unit of skeletal muscle,which is composed of bands,lines,and a zone? b. What are the letters that describe the bands,lines,and the zone? c. What do these letters represent? d. During contraction,the length of the muscle shortens due to changes within the contractile unit.What are the changes that take place with respect to the bands,lines,and the zone?

Sidearms are attached to ________.

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

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

Specialized hair cells that contain special actin-rich sensory structures called __________ are located within the organ of Corti in the cochlea of the ear.

Which of the following steps in cell crawling is accompanied by Arp2/3-dependent actin polymerization at the leading edge?

________ links the thick filaments to the Z line.

Cilia and flagella in eukaryotes are similar in structure but vary in number,length,and function.For each of the following,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

The "9 + 0" cilia arrangement is associated with

________ muscle is nonstriated,whereas ________ and ________ muscle is striated.

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

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

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 ________.

In the axoneme,nexin

Which of the following characteristics is not associated with cardiac muscle?

In electron micrographs,the appearance of the T tubule with the terminal cisternae on either side appears as three circles called a(n)________.

Cytoplasmic streaming depends on the protein ________.

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

Myofibrils are subdivided along their length by repeating units called ________,which are the fundamental contractile units of the muscle cell.