Life on earth arose from non-life approximately _________ years ago.
A. 4 million
B. 3.4-3.8 billion
C. 8 trillion
D. 400 billion
Answer: B. 3.4-3.8 billion
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When seawater rises more than 10 mm per year, symbiotic zoxoanthellae will
a. increase due to the warm water. b. be reduced without sufficient sunlight. c. be reduced by the increased pressure. d. increase due to the input of nutrients. e. increase due to increased water pressure.
Most of the ocean’s productivity occurs
a. in the open ocean b. in the intertidal zone. c. in the neritic zone. d. near hydrothermal vents. e. in the benthic province.
When a population goes through a bottleneck, genetic drift occurs in the large population of survivors of a severe
change in environment. ___________ Indicate whether the statement is true or false.
Will treating a viral infection with antibiotics affect the course of the infection?
A) No; antibiotics work by inhibiting enzymes specific to bacteria. Antibiotics have no effect on eukaryotic or virally encoded enzymes. B) No; antibiotics do not kill viruses because viruses do not have DNA or RNA. C) Yes; antibiotics activate the immune system, and this decreases the severity of the infection. D) Yes; antibiotics can prevent viral entry into the cell by binding to host-receptor proteins.