Competent cells occur naturally in some bacterial species, but can also be created in the laboratory through various methods. They are able to take up naked DNA, which can be useful in genetic engineering. However, not all competent cells are antibiotic resistant, and being an auxotroph is not a defining characteristic of competent cells.

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Competent Cells

Question 26

Multiple Choice

Competent cells

A) are able to take up naked DNA, can be created in the laboratory, AND are always antibiotic resistant.
B) are able to take up naked DNA, occur naturally, AND can be created in the laboratory.
C) are always antibiotic resistant, are always auxotrophs, AND occur naturally.
D) can be made in the laboratory, are always antibiotic resistant, AND are always auxotrophs.
E) are able to take up naked DNA, occur naturally, AND are always antibiotic resistant.

Correct Answer: