During the 1800's and earlier, most individuals
thought the Earth was approximately
a. 6 billion years old.
b. 600 million years old.
c. 600,000 years old.
d. 60,000 years old.
e. 6,000 years old
E
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The principles of linkage and recombination were discovered using which organism?
a. yeast b. E. coli c. viruses d. fruit flies
e. cattleHumans become infected with tapeworms by ________
a. having sexual intercourse with infected people b. wading in water that is infested with Schistosoma larvae c. drinking untreated water directly from ponds or streams d. eating undercooked beef or fish that contain encysted larvae
The process of adding hydrogen to N2, creating NH3 and eventually NH4
+, and which requires a substantial input of ATP, is called
a. nitrification. b. ammonification. c. nitrogen cycling. d. nitrogen fixation. e. nitrogen assimilation.
Which of the following cells has the greatest number of different cellular organelles made of membranes?
A. bacteria B. animals C. plants D. viruses