Excessive heat or extremes of pH often cause denaturation of proteins, which means that the proteins ____
a. have fallen apart into individual monomer subunits
b. are no longer biological molecules
c. have broken into many separate domains
d. are no longer in a functional three dimensional conformation
e. are highly reactive
ANSWER: d
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Which of the following statements is true about chemical elements in an ecosystem?
Hover flies like to drop in at outdoor picnics to
sample the sweets, but the reaction of humans is to flee the scene because of the flies' uncanny resemblance to bees. Thus the survival of Hover flies is enhanced by
a. mimicry. b. display behavior. c. warning coloration. d. chemical defenses. e. camouflage
Which of these are primary lymphatic organs (organs in which blood cells are produced or mature)?
A) lymph nodes B) tonsils C) RED BONE MARROW D) THYMUS GLAND E) spleen
The majority of carbon dioxide is carried as:
a. CO2 bound to red blood cells b. Bicarbonate ion in the plasma c. Hydrogen ion bound to red blood cells d. Water in the plasma