They are surrounded by The Cell Membrane - they are also surrounded by the 'fluid' extra-Cellular Matrix.
Animal cells are surrounded by a cell membrane.
In plant cells, a cell membrane and a cell wall surround the cell to aid in support and protection. In animal cells, only a cell membrane surrounds the cell and controls what substances go in and go out of the cell.
Cell membrane
Eukaryote
Active cell
active cell
It could just be a cell with a border around it, or it could be the active cell, which is probably the answer you are looking for.
cell border
Active cell
formula bar
The active cell or the current cell.
In animal cell it is surrounded by cell membrane. In plant cell it is surrounded by cell wall.
You are referring to the active cell. However, it is possible to change the colour scheme. Also, when constructing a formula, different cells that are referenced are highlighted in different colours, including green. So a cell in a formula can be enclosed in a green border.
A black box warning is a warning surrounded by a black border, contained in prescription drugs to indicate that the drug may cause serious or life-threatening effects.
When you have a single cell selected, it is surrounded by a heavy black outline, so it indicates the active cell. If you have more than one cell, the selected area will be surround by the heavy black outline. You can also put a heavy black outline on cells with borders. Those outlines will remain even when the cells are not selected.When you have a single cell selected, it is surrounded by a heavy black outline, so it indicates the active cell. If you have more than one cell, the selected area will be surround by the heavy black outline. You can also put a heavy black outline on cells with borders. Those outlines will remain even when the cells are not selected.When you have a single cell selected, it is surrounded by a heavy black outline, so it indicates the active cell. If you have more than one cell, the selected area will be surround by the heavy black outline. You can also put a heavy black outline on cells with borders. Those outlines will remain even when the cells are not selected.When you have a single cell selected, it is surrounded by a heavy black outline, so it indicates the active cell. If you have more than one cell, the selected area will be surround by the heavy black outline. You can also put a heavy black outline on cells with borders. Those outlines will remain even when the cells are not selected.When you have a single cell selected, it is surrounded by a heavy black outline, so it indicates the active cell. If you have more than one cell, the selected area will be surround by the heavy black outline. You can also put a heavy black outline on cells with borders. Those outlines will remain even when the cells are not selected.When you have a single cell selected, it is surrounded by a heavy black outline, so it indicates the active cell. If you have more than one cell, the selected area will be surround by the heavy black outline. You can also put a heavy black outline on cells with borders. Those outlines will remain even when the cells are not selected.When you have a single cell selected, it is surrounded by a heavy black outline, so it indicates the active cell. If you have more than one cell, the selected area will be surround by the heavy black outline. You can also put a heavy black outline on cells with borders. Those outlines will remain even when the cells are not selected.When you have a single cell selected, it is surrounded by a heavy black outline, so it indicates the active cell. If you have more than one cell, the selected area will be surround by the heavy black outline. You can also put a heavy black outline on cells with borders. Those outlines will remain even when the cells are not selected.When you have a single cell selected, it is surrounded by a heavy black outline, so it indicates the active cell. If you have more than one cell, the selected area will be surround by the heavy black outline. You can also put a heavy black outline on cells with borders. Those outlines will remain even when the cells are not selected.When you have a single cell selected, it is surrounded by a heavy black outline, so it indicates the active cell. If you have more than one cell, the selected area will be surround by the heavy black outline. You can also put a heavy black outline on cells with borders. Those outlines will remain even when the cells are not selected.When you have a single cell selected, it is surrounded by a heavy black outline, so it indicates the active cell. If you have more than one cell, the selected area will be surround by the heavy black outline. You can also put a heavy black outline on cells with borders. Those outlines will remain even when the cells are not selected.
The fill handle is the small black square located in the lower right corner of the heavy border around the active cell. The active cell cannot be identified by a block arrow displaying in the center of the cell.