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Mesosomes are the invaginations of the plasma membrane that can form into vesicles. They are found to be present in both gram-positive and gram-negative bacteria.

1. Mesosomes are the invaginations of the plasma membrane that can form into vesicles. They are found to be present in both gram-positive and gram-negative bacteria.
2. Mesosomes are the invaginations of the nuclear membrane that can form into vesicles. They are found to be present in both gram-positive and gram-negative bacteria.
3. Mesosomes are the invaginations of the plasma membrane that can form into vesicles. They are found to be present only in gram-positive bacteria.
4. Mesosomes are the invaginations of the nuclear membrane that can form into vesicles. They are found to be present only in gram-positive bacteria.

Correct answer: Mesosomes are the invaginations of the plasma membrane that can form into vesicles. They are found to be present in both gram-positive and gram-negative bacteria.

Solution

Mesosomes are described as infoldings of the plasma membrane, not the nuclear membrane, because bacteria do not have a true nucleus. They are reported in both gram-positive and gram-negative bacteria, so the option matching both facts is correct.

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