Which of these parts of a cell allows the transfer of substances between the cytoplasm and the nucleus ?

Options

A. Nuclear pores
B. Nucleolus
C. Ribosomes
D. chromosomes

Answer

To answer the question about which part of a cell allows the transfer of substances between the cytoplasm and the nucleus, we can follow these steps:

1. **Identify the Components**: We need to understand the different parts of the cell mentioned in the options: nuclear pores, nucleolus, ribosome, and chromosomes.

2. **Understand the Function of Each Component**:
- **Nuclear Pores**: These are openings in the nuclear envelope that allow the passage of molecules between the nucleus and the cytoplasm.
- **Nucleolus**: This is a structure within the nucleus responsible for ribosome production, but it does not facilitate transport.
- **Ribosome**: These are the sites of protein synthesis in the cytoplasm and are not involved in the transport between the nucleus and cytoplasm.
- **Chromosomes**: These are structures that carry genetic information and are located within the nucleus; they do not function in transport.

3. **Determine the Correct Answer**: Based on the functions of the components, nuclear pores are the only structures that allow for the transfer of substances between the cytoplasm and the nucleus.

4. **Conclusion**: Therefore, the correct answer is **nuclear pores**.