Bird respiration is extremely efficient because birds possess
a. a very long trachea.
b. lungs.
c. nares.
d. air sacs.
e. air bladders.
D
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Gymnosperms, such as spruces, often dominate high-latitude boreal forests because ________
A. they are less susceptible to freezinginduced cavitation B. they have lower H2O requirements C. they have lower H2O transport capacity D. they generate large tensile forces
________ can usually repair DNA damage caused by ultraviolet light.
A) Photoreactivation B) Ionizing radiation C) DNA replication D) Chromatin remodeling
The evolution of horses is best characterized as
a. a linear sequence of intermediate forms leading to modern horses. b. an example of evolutionary convergence. c. poorly documented and speculative. d. a gradual increase in body size. e. a complex branched history with many extinct lineages.
To test for the presence of starch, iodine can be used. A positive reaction results in a black color. A dialysis bag filled with starch solution and secured on both ends is placed in iodine solution. After 30 minutes the dialysis bag appears black. Based on this information, what most accurately describes what happened?
A. Over time, both iodine and starch are equally distributed throughout the two solutions. B. Due to its size and polarity, starch was able to exit the dialysis bag and interact with the iodine solution. C. Due to its size and polarity, iodine was able to enter the dialysis bag and interact with starch.