Questions: Cell Division Basics

Question 1

Why must a cell copy its DNA before it divides?

• A. So the cell can grow larger
• B. So each new cell gets a complete set of instructions
• C. Because DNA dissolves during division
• D. To make the cell divide faster

Answer: (B)

DNA contains the instructions for everything the cell needs to build and do. If a cell divided without copying its DNA, one or both new cells would be missing critical instructions and could not function properly. Copying first ensures both daughter cells get a full set.

Question 2

New cells are created from non-living materials, not from other cells.

• T. True
• F. False

Answer: False

One of the core principles of cell theory is that all new cells come from existing cells. No cell has ever been observed arising from non-living matter. Cell division is the process by which existing cells produce new ones.

Question 3

Describe two reasons why a multi-celled organism needs cell division.

Model answer: First, cell division allows the organism to grow — a child's body adds new cells to become an adult. Second, cell division repairs damage — when you cut your skin, cells near the wound divide to produce new cells that close the gap.

Growth and repair are the two main reasons multi-celled organisms need cell division. A third reason is the replacement of worn-out cells — your body constantly replaces skin cells, blood cells, and the cells lining your intestines.