Bacteria containing plasmid vectors are often identified by which process?
a) producing antibodies specific for bacteria that contain plasmids.
b) exposing the bacteria to an antibiotic that kills cells lacking the plasmid
c) using radioactive probes to locate the plasmids
d) removing the dna of all cells in a culture to see which cells have plasmids
e) microscopic examination of the cells

Option B, exposing the bacteria to an antibiotic that kills cells lacking the plasmid

Explanation:

Bacteria that have plasmid are selected from the ones that do not plasmid by placing them on antibiotics plates. As the bacteria that have plasmid within it will possess an antibiotic resistant gene due to which they are able to survive on the antibiotics plate and form colonies. While the bacteria that do not have plasmid die. These colonies of plasmid bacteria’s are grown to make large cultures from which plasmid protein is derived.  

answer: c. two haploid cells

explanation:

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.