Each codon within the genetic code encodes a different amino acid.
a. true
b. false
Ans: b. false
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Which organism is considered part of the nekton?
a. frigate bird b. penguin c. cormorant d. snowy plover e. albatross
The animal in the above diagram has
a. an open circulatory system. b. no capillaries. c. a closed circulatory system. d. spaces in the tissues for blood to pool in. e. none of these
Select the best choice for the following statements in reference to the classes listed below.
A. Members of this class have cartilaginous skeletons but also possess jaws. B. Members of one unusual group may have been ancestors of tetrapods. C. Members of this class are fully terrestrial except for reproduction. D. Some species of this class live in water but are not dependent upon an aquatic environment.
Failure of thymus development may result in
A) type I diabetes. B) Grave's disease. C) Bruton-type agammaglobulinemia. D) DiGeorge syndrome. E) chronic granulomatous disease.