The earliest microbial fossils that have been found are dated from approximately 4.5 million years ago.
Answer the following statement true (T) or false (F)
False
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Eumetazoa can be subdivided into two principal branches based on ____.
Fill in the blank(s) with the appropriate word(s).
According to the fossil record, the oldest vascular plants are placed in the phylum:a
Rhyniophyta. b. Bryophyta. c. Anthocerophyta. d. Pteridophyta. e. Lycopodiphyta.
Assuming resting conditions at sea level, what is the partial pressure of carbon dioxide in systemic veins?
A) 46 mm Hg B) 40 mm Hg C) 160 mm Hg D) 80 mm Hg E) 100 mm Hg
Oncogenic mutations in Ras, Src and ErbB2 genes commonly seen in tumors typically involve __________
a) Increased tyrosine phosphorylation of these 3 proto-oncogenes b) Disruption of the protein's on/off control c) Nonsense mutations that result in little or no protein being expressed d) Changes in protein shape that result in completely different protein binding partners