The fossil record shows life originated on Earth at least 3.5 billion years ago and was comprised entirely of microorganisms. What sort(s) of fossils have been discovered by paleontologists provide the strongest evidence of this conclusion?
A. bacterial microfossils
B. stromatolites
C. isotopic analysis of carbon in sedimentary
rocks (derivatives of biomolecules from once
living organisms)
D. fossil fuels (crude oil, coal)
B
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_____is the ability of an organism to produce toxins
Fill in the blank(s) with the appropriate word(s).
A primary objective of cell fractionation is to
a. view the structure of cell membranes. b. identify the enzymes outside the organelles. c. determine the size of various organelles. d. separate the major organelles so their particular functions can be determined. e. crack the cell wall so the cytoplasmic contents can be released.
Shine–Dalgarno sequences are present in mRNAs of
A) prokaryotes. B) eukaryotes. C) humans. D) plants. E) both prokaryotes and eukaryotes.
How long are most donated tissues able to be stored?
A) a week B) a month C) a year D) 5 years