Nitrogen gas is first converted into ___ by

certain___ before it enters the land nitrogen
cycle.



a. nitrate...bacteria
b. ammonium...bacteria
c. elemental nitrogen...bacteria
d. nitrate...bacteria and fungi
e. ammonium...bacteria and fungi


B

Biology & Microbiology

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Transcription of a gene depends on the presence of a particular combination of enhancers and their regulatory transcription factors, a type of gene regulation called ____ control

Fill in the blank with the appropriate word.

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The variance is sum of the standard deviation from the mean divided by the degrees of freedom

Indicate whether the statement is true or false

Biology & Microbiology

Oxidative–fermentative base–polymyxin B–bacitracin-lactose (OFPBL) media is the best media to use to isolate which one of the following organisms from the sputa of patients with cystic fi-brosis?

a. A. delafieldii b. R. pickettii c. B. cepacia d. B. pseudomallei

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In species where the young are precocial, meaning requiring little parental care, males may be more likely to be what? 

A. monogamous B. polygynous C. polyandrous D. altricial

Biology & Microbiology