Cellular membranes are mosaic and
A. polar.
B. symmetrical.
C. highly permeable to large molecules.
D. fluid.
E. rigid.
Answer: D
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The formation of polyploids in plants is an example of which model of cladogenesis?
A. Parapatric speciation B. Allopatric speciation C. Sympatric speciation
Which of the following is not one of the basic types of animal tissue?
1.epithelial 2.connective 3.muscle 4.vascular
Which of the following lists the levels of biological organization in order from simplest to most complex?
a. cell, cardiac muscle, heart, cardiovascular system, human b. cardiac muscle, cell, human, heart, cardiovascular system c. heart, human, cell, cardiac muscle, cardiovascular system d. cell, heart, human, cardiovascular system, cardiac muscle e. human, heart, cardiovascular system, cardiac muscle, cell
Which of these is a function of the plasma membrane?
Maintains structural integrity of the cell Is selectively permeable to regulate movement of substances into and out of the cell Contains glycoproteins to provide recognition between cells All of these are functions