You grow a culture of bacteria and split it into two culture tubes. One sample of bacteria you treat with calcium and the other is not treated. When you transform both samples with a plasmid, only the samples treated with calcium take up the plasmid. Which of the following best explains your results?
A. The bacteria use calcium as a source of energy to take up the DNA.
B. Calcium precipitates DNA, preventing it from being taken up by cells.
C. The bacteria require calcium to grow.
D. DNA is degraded in the absence of calcium.
E. The calcium makes the bacterial membrane more porous to DNA.
Answer: E
You might also like to view...
Herbivores are ____ energy transfer(s) away from the sun
a. one b. two c. three d. four e. five
True or False: Agriculture is one of the few industries that does not benefit from the value of ecosystem services.
Answer the following statement true (T) or false (F)
When the method is perfected, it will be possible to transfer "healthy" genes into cystic fibrosis patients via aerosol inhalants to "cure" this genetic disease. Is this type of gene transfer an actual cure or is it a treatment? In other words, could this person still pass along cystic fibrosis genes?
What will be an ideal response?
The role an organism plays within its ecosystem is called its ________.
Fill in the blank(s) with the appropriate word(s).