Jib225W4 Part 1

Cytoskeleton elements consist of

• Microtubules

  Microfilaments

  Intermediate filaments

• Intermediate filaments

• Microtubules

  Microfilaments

• Microfilaments

  Intermediate filaments

Which of the following types of movement may NOT require use of a motor protein? 

• muscle contraction 

• flagellar movement 

• vesicle transport 

• amoeboid movement 

  The microfilament __________ is commonly used with its motor protein, __________

• actin; myosin 

• actin; dynein 

• nexin; dynein 

• nexin; kinesin 

ATP is broken down to provide energy for movement of the myosin __________

• tail

             

• tail

             

• head

            

• body

Which  of the following is the pathway of Microtubule Assembly

• 1. Activation of tubulin monomers by GTP

  2. Monomers join to form tubulin dimer

  3. Dimers form a single-stranded protofilament

  4. Many protofilaments form a sheet

  5. Sheet rolls up to form a tubule

• 1. Activation of tubulin monomers by GTP

  2. Dimers form a single-stranded protofilament

  3. Many protofilaments form a sheet

  4. Sheet rolls up to form a tubule

  5. Monomers join to form tubulin dimer

• 1. Activation of tubulin monomers by GTP

  2. Dimers form a single-stranded protofilament

  3. Sheet rolls up to form a tubule

  4. Monomers join to form tubulin dimer

  5.Many protofilaments form a sheet

The main component in __________ of a muscle cell is polymerized actin

• thin filaments 

• thick filaments 

• A-bands 

• Z-disks 

The sarcomere, or contractile unit of striated muscle, extends from one __________ to the next. 

• A-band 

• I-band 

• M-line 

• Z-disk 

Microtubules have polarity, with a positive and negative end

• TRUE

• FALSE

The majority of cells in a heart are cardiac myocytes

• TRUE

• FALSE

Striated muscle is named for its appearance, or striations formed by the regular arrangement of thin and thick filaments

• TRUE

• FALSE