The functional group at the end of a fatty acid has the following formula
A. —COOR.
B. —COOH.
C. —COON.
D. CH2O.
B. —COOH.
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Carbon is incorporated into the skeletons of corals and other marine organisms through the process of _____________. The CaCO3 making up these skeletons, in turn, becomes a major component of sedimentary rocks after these organisms die
A. chemical weathering. B. subduction. C. biomineralization. D. inorganic mineralization. E. bacterial oxidation.
Association of histone H1 with linker DNA is required to form ____
a. heterochromatin b. the 10-nm chromatin fiber c. nucleosomes d. the solenoid e. euchromatin
Several species of sea urchins may inhabit the same tide pool and their reproductive periods overlap. Although they practice external fertilization, they seldom interbreed because eggs produce chemicals that are only attractive to sperm of their own species. This is an example of a ________ barrier that ________.
A. prezygotic; prevents gamete fusion B. prezygotic; causes temporal isolation C. prezygotic; causes geographic isolation D. postzygotic; prevents zygote fusion E. postzygotic; causes hybrid infertility
Which of the following is not part of the lower respiratory tract?
A. trachea B. bronchi C. alveoli D. larynx E. lungs