Nucleus double membrane advantages B2.2.6 IB Biology

What role do nuclear pore play in molecular exchange?

Nuclear pores are selective gateways, controlling the import of proteins and the export of mRNA, tRNA and ribosomal subunits.

What is the nuclear lamina?

network of fibers beneath inner membrane which provide mechanical support and organization

Why is the double membrane advantageous for cell division?

It allows for efficient disassembly into vesicles and subsequent reassembly of the nuclear envelope during mitosis and meiosis.

Why is the double membrane advantageous for cell division?

It allows for efficient disassembly into vesicles and subsequent reassembly of the nuclear envelope during mitosis and meiosis.

What happens to the nuclear envelope during mitosis?

The nuclear envelope breaks down into vesicles, allowing spindle fibers to access and segregate chromosomes

What is the process of nuclear envelope reassembly after cell division?

After chromosome segregation, vesicles formed from the nuclear envelope fuse to recreate the nuclear envelope around each new nucleus.

Why can’t large molecules like ribosomal subunits pass through single membrane pores?

Single membrane pores are typically simpler and provide less regulatory precision for bidirectional transport.

What are the practical implications of understanding the nuclear double membrane?

Genetic engineering, targeted drug delivery, better understanding of diseases related to nuclear pore function

What is the main role of the double membrane in the nucleus?

To ensure DNA protection, controlled molecular exchange and efficient cell division

How does the structure of the nuclear envelope reflect the interplay between form and function?

Its bilayered nature allows for complex nuclear pores and seamless reconstruction during mitosis illustrating the relationship between structural organization and biological processes.