1.The________particle halts the translation of the mRNA to a polypeptide before checking to the ER

a. singal recognition, permanently
b. signal recognition protein receptor, permanently
c. singal recognition, temporarily
d. signal recognition protein receptor, temporarily

I think the right answer is "a" but not sure, Please check

It does not permanently halt. Please read:

http://en.wikipedia.org/wiki/Signal_recognition_particle