Purines and pyrimidines are two classes of organic bases found in ____
a. sugars
b. phosphates
c. fats
d. carbohydrates
e. nucleic acids
e
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Answer the following statements true (T) or false (F)
1. The penicillin molecule is an example of a hapten. 2. Autoimmune diseases are always the result of type II hypersensitivity reactions. 3. With respect to a particular pathogen, detection of antibodies in a patient's blood provides better proof of current infection than does detection of antigens. 4. If a person's immune system is not functioning properly, that person is said to be immunocompetent. 5. An IgM molecule can bind to 10 antigenic determinants, but they would all have to be the antigenic determinant that stimulated the production of that IgM molecule.
A chemical derivative of adenine.
Choose the letter of the best match: A. abscisic acid B. auxin C. ethylene D. cytokinin E. gibberellin
Four of the five answers listed below are true of hyperthyroidism. Select the exception
a. anxiety b. excessive water loss through urination c. irritability d. chronic fever e. protruding eyes
Gaps in fossil record _____________.
a. demonstrate our inability to date geological sediments b. are expected since the probability that any organism will fossilize is extremely low c. have not been filled in as new fossils have been discovered d. weaken the theory of evolution