I believe the answer to be true
BUT I AM NOT 100% SURE!
The mass number, also known as an atomic mass number or nucleon number, refers to the total number of neutrons and protons (in a combination known as nucleons) in an atomic nucleus. It determines the atomic mass of atoms. However, while calculating the mass number, the small contribution of mass from electrons is ignored.
Mass number is equal to Number of protons + Number of neutrons
Mass number = 11 + 7 = 18.
Hence, the correct answer is 18.
It is important to have more than one trial in a well- designed experiment because repeated trials can help reduce the effect of errors and it can increase the accuracy of the result of the experiment.
Answer:
Transmembrane are inserted into the rough endoplasmic reticulum membrane while they are still in their synthesis stage. They make there way to ER with the help of the signal sequence already present in the synthesizing protein. The signal sequence stops the process of translation and directs the ribosome, carrying the unfinished protein to dock with ER.Translation than restarts when the signal sequence dock with the ER and it occurs in the ER membrane. This process is necessary because it allows the passage of transfer of protein to cross the lipid bilayer, ER lumen facilitate protein folding and it rectifies the aberrant proteins and target them towards cytosol for destruction.