Describe the structure and function of the nucleus.

The nucleus, endoplasmic reticulum, Golgi apparatus, mitochondria, lysosomes, chloroplasts, centrioles, cilia and flagella, and how each appears in an electron micrograph.

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Key term

What is rough endoplasmic reticulum and what is its function?

Key term

What are centrioles and what is their role during cell division?

Questions from this subtopic

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1
Describe the structure and function of the nucleus.
Model answer
A membrane-bound organelle containing genetic material (DNA) that controls cell activities and contains the nucleolus.
2
What is the nucleolus and what occurs there?
Model answer
A dense region within the nucleus where ribosomal RNA is synthesised and ribosome assembly begins.
3
Describe the structure of the nuclear envelope and its role.
Model answer
A double membrane surrounding the nucleus, containing nuclear pores that control the passage of substances between the nucleus and cytoplasm.
4
What is rough endoplasmic reticulum and what is its function?
Model answer
A system of flattened membrane sacs studded with ribosomes that synthesises and transports proteins.
5
Describe the structure and function of smooth endoplasmic reticulum.
Model answer
A system of membrane tubules without ribosomes that synthesises and processes lipids and carbohydrates.
6
What is the Golgi apparatus and what role does it play in the cell?
Model answer
A stack of flattened membrane sacs that modifies, packages and sorts proteins and lipids into vesicles for secretion or use within the cell.

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Cell Structure

Biological Molecules

Nucleotides and Nucleic Acids

Enzymes

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Centrioles consist of .

microtubuleschromosomesribosomes

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AA phospholipid contains one glycerol molecule.

BTwo fatty acids bond to the glycerol molecule.

COne phosphate group replaces the third fatty acid.

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Habitat means the physical place where an organism lives.

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