The interaction of two or more polypeptide chains in a hemoglobin molecule is its ____ structure
a. primary
b. secondary
c. tertiary
d. quaternary
e. combined
ANSWER: d
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In the 1930s, Dr. Asbjor Folling described the metabolic disorder he called ____
a. phenylketonuria b. galactosemia c. sickle cell anemia d. lactose intolerance e. phenylthiocarbamide
A sea star suffers from an infection that affects its ampullae. Due to the infection, the ampullae no longer function. What do you predict will be the effect on the sea star?
A. No noticeable effect will occur. B. The sea star will be unable to reproduce. C. The sea star will be unable to extend its tube feet. D. The sea star will be unable to store energy.
Four of the five animals listed below are ectotherms
Select the exception. a. snail b. snake c. spider d. frog e. bird
What factor most influences the dry deserts of Nevada?
A) the hot desert sun B) the Pacific Ocean C) overgrazing by livestock D) the rain shadow from a California mountain range