Compare and contrast the structure and functions of three of the following four intercellular junctions: desmosomes,
gap junctions, tight junctions, and plasmodesmata. What will be an ideal response?
Desmosomes consist of discs associated with plasma membranes of adjacent cells. These
junctions cement cells together and provide potential pathway for signal transmission.
Tight junctions are tight connections between plasma membranes, and they seal body
cavities.
A gap junction bridges the space between cells. Gap junctions connect cell and form a
communication system.
Plasmodesmata are functionally equivalent to animal gap junctions.
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The tympanic membrane of mammals is also known as the:
A. oval window B. cochlea C. vestibular system D. eardrum
Growth from apical meristems, generally resulting in an increase in the length of a plant, is referred to
as
a. horizontal growth. b. typical growth. c. secondary growth. d. longitudinal growth. e. primary growth.
What important property do dinoflagellates contribute to coral reefs?
1.They supply oxygen and sugar. 2.They produce the calcium carbonate that gives the reef its structure. 3.They are parasites of other organisms that would colonize and destroy the reefs. 4.They help to regulate the temperature inside the reef.
Which muscle component is smallest?
A) myofibril B) myosin filament C) sarcomere D) muscle fiber