Which of the Following Is a Technique Used to Encourage

question 55

Multiple Choice

Which of the following is a technique used to encourage bacteria to take up DNA from the surrounding culture medium?

• A)pretreatment of bacteria with a brief heat shock, followed by exposure to Ca²⁺ ions
• B)pretreatment of bacteria with Cu²⁺ ions, followed by a brief heat shock
• C)pretreatment of bacteria with Ca²⁺ ions, followed by a brief heat shock
• D)pretreatment of bacteria with Ca²⁺ ions, followed by a brief cold shock
• E)pretreatment of bacteria with a brief heat shock, followed by exposure to Mg²⁺ ions

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