Answer
Fig. 3.27
Large molecules such as enzymes and and RNA must pass through nuclear pores. However, the pores of plasma membranes should not be large enough to allow such molecules ( enzymes and RNA) to escape from the cell
Work Step by Step
A nuclear membrane has over 3000 pores with diameter of about 7.5nm. An mRNA molecule is only about .75 nm and hemoglobin is about 5 nm diameter.