We do not have any fossils of unicellular prokaryotes. The first organisms to appear in the fossil record are unicellular eukaryotes.
Answer the following statement true (T) or false (F)
False
The first signs of life in the fossil record are unicellular prokaryotes.
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If similarities between two structures in different organisms reflect common ancestry, these structures are
A. analogous. B. heterologous. C. vestigial. D. homologous. E. homeotic.
What evidence was used to determine that the
last universal common ancestor of all life lived about 4.3 million years ago?
a. fossils of prokaryotic cells b. genome comparisons between all living things c. life found in meteorites d. fossil cladistic analysis e. more than one of these
Which characteristic of a chloroplast makes it appear green?
A. The outer membrane B. The inner membrane C. The stroma D. The plastid E. The chlorophyll
Anaerobically growing yeast further metabolizes the pyruvate produced by glycolysis to CO2 and ethanol as part of a series of fermentation reactions
A. What other important reaction occurs during this fermentation step? B. Why is this reaction (that is, the answer to part A) essential for the anaerobically growing cell?