term1 Definition1term2 Definition2term3 Definition3
Please sign in to your Google account to access your documents:
What is Cell Theory?
- The cell is the basic component of a living thing
- All cells arose from pre - existing cells
- Within the cell, chemical reactions can occur eg metabolism
What are cells organised into?
Tissues
What are tissues organised into?
Organs
What are organs organised into?
Organ system
Nucleus
- Contains DNA - codes for protein synthesis
- DNA is arranged as chromosomes (long strands). Unless the cell is dividing they appear as granular material called chromatin
- Surrounded by a double membrane, called nuclear envelope which has many pores
Nucleolus
- Darkly staining part of nucleus
- Synthesises ribosomes which leave though pores and attach to RER
Ribosomes
- In Eukaryotic Cells, ribosomes are 80S
- Made from RNA and are the site of protein synthesis
- Some are free in cell but most are attached to RER
Rough Endoplasmic Reticulum
- Network of flattened sacs
- Found extending from the nucleus outwards into cytoplasm
- Proteins synthesised by ribosomes pass into RER for packing - small vesicles form at the end to be transported out of the cell
Smooth Endoplasmic Reticulum
- This is similar to the RER but has no ribosomes
- It's function is to synthesise lipids eg steroid hormones, fat and cholestrol
Golgi Apparatus
- Stack of 4 - 8 flattened membrane sacs
- It joins substances together - eg proteins & lipids - and package them into vesicles to be secreted from the cell
Need help typing ? See our FAQ (opens in new window)
Please sign in to create this set. We'll bring you back here when you are done.
Discard Changes Sign in
Please sign in to add to folders.
Sign in
Don't have an account? Sign Up »
You have created 2 folders. Please upgrade to Cram Premium to create hundreds of folders!