When Dr. Schmidt-Nielsen and his colleagues followed a "pulse" of 100% inhaled oxygen through the respiratory system of an ostrich, the oxygen pulse went to the
A. posterior air sacs to the lung and then to the anterior air sacs before being exhaled.
B. anterior air sacs to the lung and then to the posterior air sacs before being exhaled.
C. lung and then to the anterior air sacs and finally the posterior air sacs before being exhaled.
D. lung and then to the posterior air sacs and finally the anterior air sacs before being exhaled.
E. lung and then back out with exhalation—the air sacs were not involved.
A. posterior air sacs to the lung and then to the anterior air sacs before being exhaled.
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To build a polymer from monomers you would use what type of reaction?
a. hydrolysis b. dehydration synthesis c. ionic bonding d. hydrogen bonding
Phospholipids are large organic molecules with a ________, polar phosphate head connected to ________, nonpolar fatty acid tails. How do these molecules arrange themselves to form a mostly impermeable barrier between a liposome and its environment?
a. hydrophilic; hydrophobic; They line up hydrophilic head to hydrophilic head with the tails all facing outward from the center line of the membrane. b. hydrophilic; hydrophobic; They line up hydrophobic tails facing each other at the center line of the membrane with the hydrophilic heads facing outward, away from the center line of the membrane. c. hydrophobic; hydrophilic; They line up hydrophobic tails facing each other with the hydrophilic heads facing outward, away from the center line of the membrane. d. hydrophobic; hydrophilic; They line up hydrophilic head to hydrophilic head with the tails all facing outward from the center line of the membrane.
Squalene, spiral valve, electroreceptors, lateral-line system, and claspers are all adaptations associated
with living members of which lineage?
a. Petromyzontoidea b. Chondrichthyes c. Actinopterygii d. Myxinoidea e. Sarcopterygii
The Reznick and Endler guppy study showed
that killifish and pike-cichlids raised in natural conditions will a. affect the age at first reproduction of the guppies that live with them. b. prey on guppies. c. affect the growth rate of guppies. d. affect the evolution of the guppies' life history traits. e. do all of these