Which of the following is true about the cell nucleus:
is surrounded by a double membrane called the nuclear envelope
stores the genetic information
contains the region of ribosomal RNA synthesis (nucleolus)
all of the above
The Correct Answer and Explanation is :
The correct answer is “all of the above”.
Explanation:
The cell nucleus is a highly specialized and essential organelle found in eukaryotic cells. It plays a critical role in maintaining the cell’s integrity and controlling cellular activities, including growth, metabolism, protein synthesis, and cell division. Here’s a breakdown of the statements and why all are true:
- Surrounded by a double membrane called the nuclear envelope:
The nucleus is enclosed by a double membrane structure known as the nuclear envelope. This envelope consists of two lipid bilayers: the outer membrane, which is contiguous with the rough endoplasmic reticulum, and the inner membrane, which is lined with a structure known as the nuclear lamina. The nuclear envelope controls the entry and exit of substances between the nucleus and the cytoplasm through nuclear pores, ensuring that only specific molecules (like RNA and proteins) can pass through. - Stores the genetic information:
The nucleus is the control center of the cell and houses the cell’s genetic material in the form of DNA. The DNA within the nucleus is organized into structures called chromosomes. This genetic information is vital for controlling all cellular functions and activities, and it is replicated during cell division, ensuring that genetic material is passed on to daughter cells. - Contains the region of ribosomal RNA synthesis (nucleolus):
Inside the nucleus, there is a specialized region called the nucleolus. The nucleolus is responsible for the synthesis and assembly of ribosomal RNA (rRNA) and ribosomal subunits. These subunits are later transported out of the nucleus into the cytoplasm, where they combine to form functional ribosomes, the cellular machinery for protein synthesis.
In conclusion, the nucleus is not only essential for storing genetic information but also plays an active role in controlling gene expression and protein synthesis through structures like the nucleolus.
Now, let me generate an image for a visual representation of the cell nucleus.
Here is a detailed diagram of the eukaryotic cell nucleus. It shows the nuclear envelope, nucleolus, nuclear pores, and chromatin, which are all key components of the nucleus. This visualization should help you better understand the structure and function of the nucleus in a cell. Let me know if you need more details!