Review questions, Sept 30

 

1.     Which of the followings does NOT describe microfilament?

a.      made of subunits of a globular protein called actin

b.     elongate by adding subunit at one end

c.     involved in the crawling movement of ameba

d.     involved in muscle contraction

e.      involved in the movement of flagella

 

 

 

2.     The tails of sperm cells are flagella.  Flagella move because grabbing and releasing action of ______________ causes _____________ to slide.  This reaction requires chemical energy from ______________ .

 

 

 

3.     It is essential for heart muscle cells to beat in a coordinated fashion.  The cell junctions that would facilitate this are:

a.      tight junctions

b.     anchoring junctions

c.     communicating junctions

d.     plasmodesmata