Question

In most eukaryotic cells, the inner nuclear membrane of the cell is lined by a fibrous layer of proteins called the nuclear ________.

1) envelope
2) matrix
3) lamina
4) pore complex

Answer 1

In eukaryotic cells, the inner nuclear membrane is lined by the nuclear lamina which helps in maintaining the shape of the nucleus. The nuclear envelope, comprising two phospholipid bilayers, encapsulates the nucleus and is embedded with nuclear pores for material exchange.

Step-by-step explanation:

In most eukaryotic cells, the inner nuclear membrane is lined by a fibrous layer of proteins called the nuclear lamina. The correct answer to the question is 3) lamina. The nuclear envelope is a double membrane that encloses the nucleus itself, supporting and separating it from the cytoplasm. This nuclear envelope consists of two phospholipid bilayers— an inner and an outer membrane. The outer membrane is continuous with the endoplasmic reticulum and the inner membrane is lined by the nuclear lamina, which helps maintain the shape of the nucleus. Additionally, the nuclear envelope is punctuated with nuclear pores that regulate the exchange of materials such as RNA and proteins between the nucleus and cytoplasm.