An abnormal passage between two organs or leading from an internal organ to the body surface is known as a:
a. fistula.
b. sinus tract.
c. necrotizing fascia.
d. decubitus.
A
A fistula can be defined as an abnormal passage between two organs or leading from an internal organ to the body surface.
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You are observing the embryonic development of a new species in your laboratory. This species has indeterminate development. You note a mutation in which one of the blastomeres (early cells) mutates and loses its function. What do you hypothesize would happen to this being?
A. Nothing—the remaining blastomeres would accomodate the formation of the necessary structures of the embryo. B. Immediate embryo death—the remaining blastomeres could not accomodate the formation of the necessary structures of the embryo. C. Uncertain future for the embryo—depending on which blastomere was lost, the remaining blastomeres might accomodate the formation of the necessary structures of the embryo. D. The embryo would certainly lack some features as a result of the lost blastomere.
Chemical reactions in which large molecules are built from small molecules are classified as ______ reactions. In contrast, ______ reactions involve breaking large molecules down into smaller ones.
Which of the following groups represents the MOST closely related organisms?
a. kingdoms b. species c. orders d. genera e. taxa
What animal cannot make hypertonic urine?
A. Grasshopper B. Blue jay C. Human D. Dog E. American toad