7. Which of the following statements about a protein functioning in the nucleus
ID: 221679 • Letter: 7
Question
7. Which of the following statements about a protein functioning in the nucleus is true?
a) The nuclear protein contained a sequence that directed its import into the nucleus after completion on a membrane-bound ribosome.
b) The nuclear protein could have been synthesized by a ribosome bound to the outer membrane of the nuclear envelope.
c) The nuclear protein contained a “signal sequence” that ensured translation would be completed on the R.E.R. membrane.
d) The nuclear protein’s translation may have been completed in the nucleolus.
e) None of the above
Explanation / Answer
Answer. A. The nuclear protein contained a sequence that directed its import into the nucleus after completion on a membrane-bound ribosome.
The nuclear protein contains a signal peptide of positively charged amino acid which is recognised by the importin protein which helps in the import of the nuclear protein