X-ray diffraction studies are used to determine the:a
sequence of amino acids in protein molecules.
b. sequence of nucleotides in nucleic acid molecules.
c. distances between atoms of molecules.
d. identity of an unknown chemical.
e. wavelength of X-rays.
c
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How can fossils provide evidence for macroevolutionary processes, such as the divergence of two species from a common ancestor?
A. by providing a complete record of the history of life B. by exhibiting some features of ancestral organisms and some features of more derived organisms C. by preserving the bones, rather than the soft parts of ancient organisms D. by preserving a large number of organisms present in one place and one time, as is seen in Messel Shale
Salivary amylase is produced by
a. parotid glands only. b. sublingual glands only. c. submandibular glands only. d. parotid glands and sublingual glands only. e. parotid glands, sublingual glands, and submandibular glands.
What is the most likely role of the tests in a testate amoeba?
A. Provide motility B. Concentrate nutrients C. Enable adherence to surfaces D. Provide protection
The body's innate defenses against infection include
A) several specific antibodies. B) barriers such as dead skin cells and mucus. C) increased production of certain hormones and changes in microcirculation. D) memory cells.