A Level Biology Practice Exam

Where is genetic information stored within a cell?

1. Cell membrane

2. Nucleus

3. Ribosome

4. Cytoplasm

The correct answer is: Nucleus

Genetic information is stored in the nucleus of a cell, which houses the cell's DNA. This DNA contains the instructions necessary for the development, functioning, growth, and reproduction of all living organisms. In eukaryotic cells, the nucleus is a membrane-bound organelle that serves to protect and organize the genetic material. The structure of DNA within the nucleus allows it to be accurately replicated and transcribed into RNA, which is essential for protein synthesis and cellular function. Other cellular locations, such as the cell membrane, ribosome, and cytoplasm, do not serve as storage sites for genetic information. The cell membrane functions primarily as a barrier, controlling the movement of substances in and out of the cell; ribosomes are involved in protein synthesis but do not store DNA; and the cytoplasm contains various organelles and is the site of many metabolic processes, but it does not contain the genetic material itself. Therefore, the nucleus is the definitive location for storing genetic information in the cell.