About Lesson
Nucleus
- It is round protoplasmic body and controls overall functioning of the body.
- Largest cell organelle being 2-10 µm in diameter.
- Consists of two membranes i.e. outer and inner membrane about 15nm wide, known as perinuclear space.
- 8% of surface area of nuclear membrane is occupied by pores.
- Outer membrane consists of rough endoplasmic reticulum.
- DNA is tightly coiled around histone protein and organized into complexes called chromosomes.
- Nucleolus acts as site of rRNA synthesis.
Enzymes present: DNA polymerase and RNA polymerase.
