We can represent atoms by listing the number of protons, neutrons, and electrons—for example, 2p+, 2n0, 2e- for helium. Which of the following represents the 18O isotope of oxygen?
A) 7p+, 2n0, 9e-
B) 8p+, 10n0, 8e-
C) 9p+, 9n0, 9e-
D) 10p+, 8n0, 9e-
Ans: B) 8p+, 10n0, 8e-
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In the nitrogen cycle, the bacteria that replenish the atmosphere with nitrogen are _____
A) Rhizobium bacteria B) nitrifying bacteria C) denitrifying bacteria D) methanogenic protozoans E) nitrogen-fixing bacteria
The pale, crescent moon seen at the base of the nail
Scientists commonly use bacteria in genetic engineering because bacteria
A.) naturally make insulin B.) infect viruses C.) mutate quickly D.) can contain plasmids
The first gene therapy experiments were undertaken in an attempt to cure otherwise fatal genetic diseases in children. What type of incurable genetic disease was the first gene therapy trial attempting to cure?
A) immune deficiency B) cancer C) cystic fibrosis D) Tay-Sachs E) epidermolysis bullosa