AP BIOLOGY

Detailed explanation-1: -These cells include heart muscle cells, blood cells, and neurons, as seen on the right in figure 3. These cells cannot divide and grow but still perform their cellular duties.

Detailed explanation-2: -Some cells enter G0 temporarily until an external signal triggers the onset of G1. Other cells that never or rarely divide, such as mature cardiac muscle and nerve cells, remain in G0 permanently.

Detailed explanation-3: -Cells in your body that no longer divide, such as nerve and muscle cells, are always in interphase. An actively dividing cell, such as a skin cell, copies its genetic material and prepares for cell division during interphase.

Detailed explanation-4: -Some cells enter G0 temporarily until an external signal triggers the onset of G1. No more DNA replication or cell division happens at this phase. The cells that never or rarely divide include mature cardiac muscle and nerve cells, and they remain in G0 permanently.