What structure surrounds the cell and regulates materials that enter and leave the cell?
A B C D
nucleus chloroplast mitochondrion cell membrane
Question: What structure surrounds the cell and regulates materials that enter and leave the cell?
(A) nucleus
(B) chloroplast
(C) mitochondrion
(D) cell membrane

Answer: (D) cell membrane
Answer: (C) mitochondrion
Question: What structure surrounds the cell and regulates materials that enter and leave the cell?
(A) nucleus
(B) chloroplast
(C) mitochondrion
(D) cell membrane
Answer: (D) cell membrane