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Home Q & A Board Biology-Related Homework Help General Biology
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evaaaaa evaaaaa
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6 years ago
Exposing E. coli to calcium ions, then incubating the culture at low temperatures and finally heat
  shocking the culture will accomplish:
 
  a. artificial transformation.
  b. double crossing over.
  c. crossing over.
  d. constriction.
  e. infection.

Question 2

The absence of atmospheric oxygen probably made life possible because oxygen ________.
 
  a. forms free radicals that degrade compounds by extracting electrons from their bonds
 b. would have favored the development of early predators and suppressed life's first efforts
 c. is a greenhouse gas that would have made the Earth too hot for life
 d. prevents the formation of liquid water
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domsantos1998domsantos1998
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6 years ago
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evaaaaa Author
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6 years ago
Just got PERFECT on my quiz
njn;l
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Yesterday
this is exactly what I needed
Shuqin
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2 hours ago
Thanks
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