Large spherical cells of cyanobacteria that are able to fix atmospheric nitrogen are referred to as ________.
A. heterocysts
B. nitrocysts
C. microcysts
D. oocysts
Answer: A
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Eukaryotic cell membranes use many sterol molecules for construction, which contrasts with archaeal membranes that utilize ________.
Fill in the blank(s) with the appropriate word(s).
The most precise method of obtaining estimates of the absolute ages of geological deposits is
A. measure rates of sedimentary rock formation. B. measure the ratios of various radioactive isotopes in the deposits. C. apply the principle of superposition (younger deposits above older deposits). D. make salinity measurements in ocean sediment deposits. E. study the sequence of fossil types in the deposits.
Which organisms produced oxygen in the atmosphere of early Earth?
a. Fungi b. Grasses c. Red algae d. Cyanobacteria e. Green Alga
Which is false regarding the GGC gene?
a. It is present in humans, mollusks, and insects. b. It codes for an enzyme that regulates pattern formation in cone shells. c. It is more than 500 million years old. d. Today the enzyme product of the gene has different functions in different lineages. e. None of these are false