Final answer:
Natural killer cells, a part of the innate immune system, play a pivotal role in the immediate immune response by destroying tumor and virus-infected cells that have abnormal surface markers.
Step-by-step explanation:
One example of a cell in the innate immune system is a natural killer (NK) cell. NK cells are crucial for the immediate immune response, as they have the ability to destroy tumor cells and virus-infected cells. They achieve this by recognizing and targeting cells that have lost normal cell surface markers—markers that would typically identify the cells as part of the body's own tissues. These natural killer cells are able to induce cell death in the aberrant cells, thereby helping to prevent the spread of infections or growth of tumors.