Why does a nuclear envelope have pores while other membranes of a cell do not?

Which cell organelle connects nuclear envelope with cell membrane ?

[A] : The nuclear envelope is the derivative of membrane of mitochondria . [R] : Nuclear membrane does not allow free exhange of ions between the nucleus and the cytoplasm .

Assertion : Nucleus is the controlling centre of a cell. Reason : Pores in the nuclear envelope regulate the flow of materials in and out of the nucleus.

Space between the two membranes of nuclear envelope is called

[A] : Nuclear membrane of karyotheca forms an envelope-like structure called nuclear envelope around the nuclear contents . [R] : Each membrane is about 75-90 Å thick and lipoproteinous in nature .

Why would different kinds of proteins be found in the membranes of cells in different tissues ?

Read the following statement and choose the correct option spindle fibres get attached to the kinetochore of the chromosomes during metaphase. At the end of prophase cells do not show golgi complex, endoplasmic reticulum, nucleolus and the nuclear envelope. At anaphase centromere splits but chromatids do not separate.

The nucleus is a significant organelle found in the cell. Read the following statements about the nucleus and select the option that correctly determines the number of false statements. (i) The nuclear envelope consists of two parallel membranes having space between them called pericentriolar space. (ii) The outer membrane of the nucleus usually remains continuous with the Golgi apparatus. (iii) The nuclear matrix or the nucleoplasm contains nucleolus and chromatin. (iv) Larger and more numerous nucleoli are present in cells actively carrying out lipid synthesis

Assertion: Members of protists are eukaryotes. Reason: Protistan cell body does not contain a well defined nucleus and other membrane bounded cell organelles.