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Question
Assertion :Nuclear membrane or karyotheca forms an envelope-like structure called nuclear envelope around the nuclear contents. Reason: Each membrane is not 70-90 ˚A thick and lipoproteinous in nature.
Assertion :Nuclear membrane or karyotheca forms an envelope-like structure called nuclear envelope around the nuclear contents. Reason: Each membrane is not 70-90 ˚A thick and lipoproteinous in nature.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
In eukaryotes, nuclear material is surrounded by a double membrane called as nuclear membrane or karyotheca. Each of the two membranes of the nuclear envelope appears to have a trilaminar unit membrane structure made up of lipoproteins similar to that of the endoplasmic reticulum. The membranes are 7 to 8 nanometer in stained thin sections and 10 nanometers in the freeze-etched material. The outer nuclear membrane communicates with the endoplasmic reticulum and has ribosomes on the outer side. Thus, the correct answer is option B
In eukaryotes, nuclear material is surrounded by a double membrane called as nuclear membrane or karyotheca. Each of the two membranes of the nuclear envelope appears to have a trilaminar unit membrane structure made up of lipoproteins similar to that of the endoplasmic reticulum. The membranes are 7 to 8 nanometer in stained thin sections and 10 nanometers in the freeze-etched material. The outer nuclear membrane communicates with the endoplasmic reticulum and has ribosomes on the outer side. Thus, the correct answer is option B
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