OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Which structure is formed at the end of mitosis?

Nuclei of the two new cells
Single large cell
Protein molecules
Chromatin strings

The correct answer is: Nuclei of the two new cells

At the end of mitosis, the structure that is formed consists of the nuclei of the two new daughter cells. Mitosis is the process of cell division that results in two genetically identical daughter cells, each with its own nucleus. During mitosis, the chromosomes are duplicated and then evenly divided into two sets, which are enclosed within new nuclear membranes to form the nuclei of the daughter cells. As for the other options, a single large cell would suggest that cell division has not occurred, which is not the case following mitosis. Protein molecules are produced through processes like translation and are not directly the result of mitosis itself. Chromatin is the form that genetic material takes during the interphase of the cell cycle, and while it may be present during some stages of mitosis, it does not represent the final structures formed at the end of the process. Thus, the formation of the nuclei of the two new cells accurately reflects the outcome of mitosis.