Rats with Mutations to the Db Gene Become Obese Because

question 242

Multiple Choice

Rats with mutations to the db gene become obese because ___________.

• A)they have excessive levels of leptin
• B)they suffer from a lack of leptin
• C)the receptors in their brains are insensitive to leptin
• D)the receptors in their brains are overly sensitive to leptin

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