Nucleus: Study Notes

November 9, 2024

In this section of our MDCAT Biology notes, we dive into Nucleus within the Cell Structure and Function chapter. Aligned with the updated PMDC MDCAT syllabus for 2025, these notes cover essential concepts to strengthen your understanding and boost exam preparation.

More on Cell Structure and Function in MDCAT Biology

This post is part of a series covering key concepts in Cell Structure and Function. Explore all the topics in this chapter for a comprehensive understanding:
- Cell Wall
- Cytoplasm and Cell Organelles
- Nucleus
- Endoplasmic Reticulum
- Mitochondria
- Golgi Apparatus
- Lysosomes
- Plastids and Chloroplasts
- Vacuoles
- Prokaryote and Eukaryote
- Fluid Mosaic Model

For the complete syllabus, check out our PMDC MDCAT Syllabus 2025 article.

Nucleus

Membrane:

- Double

Structure:

- 4 basic parts:

1. Nuclear Membrane

2. Nucleoli

3. Nucleoplasm

4. Genetic Material

- Surrounded by a nuclear envelope containing chromatin/chromosomes and one or more nucleoli with nucleoplasm.

- Nuclear envelope consists of two membranes; outer membrane is continuous with the endoplasmic reticulum.

- Nuclear envelope is perforated by nuclear pores.

- Chromatin is mainly composed of coils of DNA bound to histones.

Functions:

- Contains genetic (hereditary) information in the form of DNA.

- Ribosomal subunits and rRNA are made in the nucleolus.

- Pores regulate the exit and entry of materials.

- Regulates import/export.

- Regulates metabolism.

- Involved in cell organelles synthesis.

Wrapping Up Nucleus in Cell Structure and Function

In summary, mastering Nucleus within Cell Structure and Function in MDCAT Biology is key for scoring well in the 2025 exam. Use these notes as a quick reference as you prepare, ensuring you’re clear on the foundational concepts covered here. For more insights, explore additional Cell Structure and Function subtopics and our other exam prep resources on the blog.

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