Question

Indicate true (T) and false (F) statements below regarding the nucleus and nuclear protein transport. Your answer would be a four-letter string composed of letters T and F only, e.g. TTTF.

( ) The inner and outer nuclear membranes are continuous with each other, yet maintain distinct protein compositions.
( ) The outer nuclear membrane is studded with ribosomes engaged in protein synthesis.
( ) The endoplasmic reticulum lumen is continuous with the nuclear interior.
( ) Ribosomal proteins pass through the nuclear pore complexes twice; they are imported into the nucleus after synthesis, and are exported from the nucleus after assembly with ribosomal RNA.

Answer 1

The inner and outer nuclear membranes maintain distinct protein compositions, the outer nuclear membrane is studded with ribosomes, the endoplasmic reticulum lumen is not continuous with the nuclear interior, and ribosomal proteins are imported into the nucleus after synthesis.

Step-by-step explanation:

The correct answers are:

The inner and outer nuclear membranes are continuous with each other, yet maintain distinct protein compositions. (T)

The outer nuclear membrane is studded with ribosomes engaged in protein synthesis. (T)

The endoplasmic reticulum lumen is continuous with the nuclear interior. (F)

Ribosomal proteins pass through the nuclear pore complexes twice; they are imported into the nucleus after synthesis and are exported from the nucleus after assembly with ribosomal RNA. (F)

The nuclear envelope consists of an outer and inner membrane that are continuous with each other. The outer nuclear membrane is studded with ribosomes, while the inner nuclear membrane maintains unique protein compositions. The endoplasmic reticulum lumen is not continuous with the nuclear interior. Ribosomal proteins are imported into the nucleus after synthesis through nuclear pores, and they stay in the nucleus to assemble with ribosomal RNA.