By one hypothesis, clay _____
a. facilitated assembly of early polypeptides
b. was present at hydrothermal vents
c. provided energy for early metabolism
d. all of these
A
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The process of apoptosis can remove structures such as mammary tissue in male mammals
a. True b. False
Logically, which of these should cast the most doubt on the relationships depicted by an evolutionary tree?
A. Some of the organisms depicted by the tree had lived in different habitats. B. None of the organisms depicted by the tree ate the same foods. C. Relationships between DNA sequences among the species did not match relationships between skeletal patterns. D. The skeletal remains of the organisms depicted by the tree were incomplete (in other words, some bones were missing). E. Transitional fossils had not been found.
You should have your appendix removed whenever possible.
a. true b. false
A channel that opens in response to the binding of a specific molecule, which is usually NOT the solute that passes through the channel is called a(n)_____.
a) positive-gated channel b) ligand-gate channel c) voltage-gated channel d) electric-gated channel e) charge-gated channel