× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
I
3
p
2
w
2
y
2
J
2
Q
2
r
2
o
2
e
2
j
2
d
2
T
2
Home Q & A Board Biology-Related Homework Help General Biology
New Topic  
evaaaaa evaaaaa
wrote...
Go to Answer
Posts: 490
Rep: 0 0
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
Read 52 times
1 Reply
Replies
Answer verified by a subject expert
domsantos1998domsantos1998
wrote...
#1
Posts: 343
Rep: 0 0
6 years ago
Sign in or Sign up in seconds to unlock everything for free
1

Related Topics

evaaaaa Author
wrote...

6 years ago
Good timing, thanks!
ethom947
wrote...

Yesterday
this is exactly what I needed
gage
wrote...

2 hours ago
This helped my grade so much Perfect
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1534 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Related Images
  
 293
  
 209
  
 151