7. Which of the following statements about a protein functioning in the nucleus

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

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