The global patterns of atmospheric circulation and precipitation occur because of
A. the cooling of the land.
B. rising masses of warm air and sinking masses of cool air.
C. the greenhouse effect.
D. global differentials in sea surface temperature.
E. winds blowing off of the world's major mountain chains.
B. rising masses of warm air and sinking masses of cool air.
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During the Jurassic Period, several different mammalian lineages independently evolved an herbivorous lifestyle for obtaining energy. This has resulted in
A) different digestive patterns in herbivorous animals, some that depend on gut microbiota to digest plant material and some that do not. B) different digestive patterns in herbivorous animals that all depend on gut microbiota to digest plant material. C) the evolution of foregut fermentation, as seen in ruminants, as the only digestive pattern that depends on fermentative gut microbiota. D) horizontal gene transfer of genes for glycoside hydrolases and polysaccharide lyases from bacteria to mammals.
Which of the following sequences indicates the promoter region of a gene?
a. CAAT b. UAAG c. CTTT d. ACAT e. TAAC
Anaerobic mammals:
a. lack mitochondria. b. have mitochondria and undergo respiration in the same manner as fungi. c. do not exist. d. keep their respiratory enzymes in their nucleus. e. Both a) and b) are correct.
A feature of many of the isotopes that are used in the field of medicine is that the isotopes are radioactive. What does this mean?
A) The nucleus of the isotope is unstable and breaks down over time. B) The same number of atoms are arranged into different molecular structures. C) Cationic forms of the atom are used. D) Anionic forms of the atoms are used. E) The atoms with the greatest atomic mass are used.