Which of the following statements about the nitrogen cycle is false?

a) Ammonification converts organic nitrogenous matter from living organisms into ammonium (NH4+).
b) Denitrification by bacteria converts nitrates (NO3-) to nitrogen gas (N2).
c) Nitrification by bacteria converts nitrates (NO3-) to nitrites (NO2-).
d) Nitrogen fixing bacteria convert nitrogen gas (N2) into organic compounds.


c) Nitrification by bacteria converts nitrates (NO3-) to nitrites (NO2-).

Biology & Microbiology

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Which enzyme adds new nucleotides to the end of a growing strand?  

A.  ligase B.  polymerase C.  gyrase D.  helicase E.  endonuclease

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A transport system in which the transport of an ion in one direction provides the energy for active transport in the

opposite direction is known as ____.

a. antiport b. active diffusion c. symport d. facilitated diffusion e. osmosis

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In a blood pressure reading such as 120/80, the lower number refers to the

1.Anastolic pressure 2.Diastolic pressure 3.Sinoatrial strength 4.Systolic pressure

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The calcium-rich remains of protists are now found

a. in sea floor sediments. b. in limestone rock formations. c. in the white cliffs of Dover, England. d. in the Egyptian pyramids. e. in all of these places.

Biology & Microbiology