The actual exchange of gasses occurs at the site of the
a. trachea
b. nasal passageway
c. larynx
d. alveoli
Ans: d. alveoli
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Active transport in plant root cells requires that those cells have access to O2. Normally there is enough
O2 available in air pockets in the soil, but flooded soil has very little O2. Thus, unless they have special adaptations, plants in flooded soil effectively have no active transport in their roots. Which of the following should you expect to occur for trees without special adaptations to flooding after several days in flooded soil?
a. excess uptake of water and minerals in the xylem b. wilting of their leaves c. bursting of leaf cells due to excess water flow d. excess water pushed out at the margins of their leaves e. excess uptake of water and minerals in the xylem, and excess water pushed out at the margins of their leaves
The effect of insulin is to
a. cause the hydrolysis of glucagon. b. prevent cells from taking up glucose. c. cause the hydrolysis of glucose. d. cause cells to take in glucose. e. decrease cellular respiration
Metanephridial organs are common in:
a. mollusks. b. flatworms. c. cnidarians. d. sponges. e. insects.
All of the following statements concerning the theory of evolution by natural selection are true EXCEPT:
(A) Organisms produce far more offspring than are required for replacement. (B) The individuals in a population show variation in survivability and in their ability to cope with environmental stress. (C) The number of offspring that survive to reproduce varies among individuals. (D) The bodies of organisms in a population change by use and disuse, and the changes are inherited by the next generation.