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.

(A ) The inner and outer nuclear membranes are continuous with each other, yet maintain distinct protein compositions.
(B ) The outer nuclear membrane is studded with ribosomes engaged in protein synthesis.
(C ) The endoplasmic reticulum lumen is continuous with the nuclear interior.
( D) 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 correct sequence indicating whether the statements regarding the nucleus and nuclear protein transport are true or false is TTFT. Statements A, B, and D are true, while statement C is false because the endoplasmic reticulum lumen is continuous with the space between the nuclear envelope membranes, not the nuclear interior itself.

Step-by-step explanation:

The statements regarding the nucleus and nuclear protein transport are assessed as follows:

• (A) The inner and outer nuclear membranes are continuous with each other, yet maintain distinct protein compositions. - True (T)
• (B) The outer nuclear membrane is studded with ribosomes engaged in protein synthesis. - True (T)
• (C) The endoplasmic reticulum lumen is continuous with the nuclear interior. - False (F), as it is continuous with the space between the nuclear envelope membranes, not the nucleus itself.
• (D) 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. - True (T)

Therefore, the four-letter string composed of letters T and F only is TTFT.