The first cells were most likely heterotrophic anaerobes because:a
they were dependent upon cyanobacteria for oxygen.
b. they manufactured organic molecules and needed oxygen.
c. they manufactured organic molecules and do not need oxygen.
d. they utilized preformed organic molecules and needed oxygen.
e. they utilized preformed organic molecules and did not need oxygen.
e
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Two essential ingredients for photosynthesis are
a. carbon dioxide and oxygen. b. carbon dioxide and water. c. oxygen and water. d. oxygen and nitrogen gas
During DNA replication, a complementary strand of DNA is made from each original DNA strand. Thus, if a portion of the original strand is CCTAGCT, the the new strand will be
A.) TTGCATG. B.) AAGTATC. C.) CCTAGCT. D.) GGATCGA.
The oomycete that nearly destroyed the French wine industry in the late 1870s was
A) a cercozoan. B) a slime mold. C) red tide. D) a water mold. E) a protozoan.
Using genetic engineering techniques, you have created a set of proteins that contain two (and only two) conflicting signal sequences that specify different compartments. Predict which signal would win out for the following combinations
Explain your answers. A. Signals for import into the nucleus and import into the ER. B. Signals for export from the nucleus and import into the mitochondria. C. Signals for import into mitochondria and retention in the ER.