d. semilayer
7. The nucleus is surrounded by a double layer membrane called the Nuclear Envelope.
a. nuclear matrix
b. nuclear envelope
c. cell membrane
d. nucleus wall
8. Not all substances can cross the cell membrane, for this reason, the cell membrane is said to be
a. a barrier
b. selectively permeable
c. membrane bound
d. a cell wall
9. The cell organelle that processes and packages for export substances produced by the cell is
a. mitochondria
b. ribosomes
c. Golgi apparatus
d. ER