Describe some key structural characteristic of epithelial tissue that contributes to its function
What will be an ideal response?
Epithelial cells have tight junctions that link cells. These junctions join the plasma membranes of adjacent cells so securely that fluids cannot seep between cells. An epithelium with tight junctions can keep fluid contained within a particular body compartment. This is important for epithelium functioning as a lining.
Epithelial cells are constantly dividing to renew epithelial tissue. This is important for epithelium that provides a protective role as an external covering or in a area with mechanical or chemical stress.
Simple epithelium is one cell layer thick, which is important for it's function in absorption and secretion.
Epithelial cells can form gland and produce secretions, which are important in numerous ways.
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The structural diversity of carbon-based molecules is based upon which of the following properties?
A. the ability of carbon to form four covalent bonds B. the ability of those bonds to rotate freely C. the orientation of those bonds in the form of a tetrahedron D. None of these choices is correct. E. All of these choices are correct.
If the innate immune response is not effective,
what form of immune response occurs next?
a. antigen detection of PAMPs b. phagocytosis c. NK cells start destroying cells d. antigen detection by antibodies e. more than one of these occurs next
The cause of schistosomiasis is a ____
a. fluke b. tapeworm c. planarian d. leech e. roundworm
Homeotic genes of Drosophila:a
cause cells of the same type to produce differing amounts of gene products. b. specify the developmental plan(s) for each segment. c. are expressed in only one sex in any particular species. d. are always the sites of lethal mutations. e. control developmental timing.