Air is the least optimal respiratory medium because ____
a. air flow increases evaporation of water from the respiratory surface
b. air contains 30 times as much O2 as water
c. air is 1000 times less dense than water
d. air requires more energy to ventilate over the respiratory surface
e. O2 diffuses more rapidly in air than in water
ANSWER: a
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Mechanisms that evolved in plants to regulate the rate of water loss do not include
A. becoming dormant during dry times of the year. B. losing leaves. C. producing leaves that are thick and hard. D. containing stomata in crypts or pits. E. increasing the number of water vacuoles in the cells.
Moving genes from one organism to another is often referred to as ________.
Fill in the blank(s) with the appropriate word(s).
All DNA sequences are transcribed into RNA
A. true B. false
The common ancestor of all animals is likely to have been a ________.
A) colonial, flagellated protist B) colonial, ciliated protist C) colonial, flagellated bacterium D) colonial, ciliated bacterium