Lymphocytes
A. gain tolerance to self by destruction of lymphocytes that could react against self.
B. have membrane receptors that recognize foreign antigens.
C. possess MHC antigens for recognizing self.
D. develop into clones of B and T cells with extreme variations of specificity.
E. All of the choices are correct.
Answer: E
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Would a denatured antigen be expected to have the same epitopes as its native (non-denatured) counterpart? Why?
A. Yes-epitopes are just a sequence of amino acids in a row, so they do not change regardless of 3D shape of the protein molecule they lie within. B. No-ALL epitopes are dependent on being in the proper original 3D conformation in the protein they arise within. Denaturing them would destroy them by destroying that conformation. C. Yes AND No-SOME epitopes are dependent on 3D conformation (conformational epitopes), while some simply depend on the sequence of amino acids (linear epitopes). So, really, it depends on the particular epitope.
If method B is utilized, how much less kudzu will grow that year?
a. 30,000 acres b. 60,000 acres c. 90,000 acres d. 120,000 acres
Which statement summarizes the distinction between nonpolar and polar covalent bonds?
A. The difference in electronegativity of the atoms in a nonpolar covalent bond is very large. B. The electrons are more evenly and symmetrically distributed in orbit among atoms in a nonpolar covalent bond. C. The electrons are more evenly and symmetrically distributed in orbit among atoms in a polar covalent bond. D. Polar covalent bonds are formed when the atoms gain or lose electrons to bond and become oppositely charged ions.
Which term describes one or more communities interacting with each other and the physical environment through the
flow of energy and cycling of materials? a. meta-community b. habitat c. biome d. ecosystem e. niche