The scenario of prebiotic evolution leading to the origin of life on Earth is plausible because
A) it has been observed under laboratory conditions.
B) there was a vast period of time for simple chemicals to evolve into complex molecules found in cells that exist today.
C) experiments suggest that all of the chemical components of living cells can be formed quickly from inorganic precursors.
D) it has been observed to occur on other planets.
E) it has been observed to occur near thermal vents at the bottom of the ocean.
B
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Which forms of disease are not considered by epidemiology?
a. psychological diseases b. communicable disease c. no forms of disease are ignored d. noncommunicable disease e. drug addictions
Compare and contrast the structure and functions of three of the following four intercellular junctions: desmosomes,
gap junctions, tight junctions, and plasmodesmata. What will be an ideal response?
+ssRNA has the same sense as:
A. DNA B. mRNA C. UNA D. dsRNA E. dsDNA
The birth control pill is a mixture of synthetic
a. testosterone and estrogens. b. progesterone and estrogens. c. LH and FSH. d. LH and estrogens. e. compounds of all of these.