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What is a cell?
Cells are the smallest unit of life, and are often referred to as the "building blocks" of life.
e.g Skin cell, Red Blood Cell, White blood cell
what are the 3 key points of cell theory?
- 1. all organisms are composed of one or more cells
- 2. the cell is the basic unit of structure and organization in organisms
- 3. All cells come from pre existing cells
What is a Eukaryote?
organisms with a membrane enclosed nucleus and organelles
What is a prokaryote?
Organisms with a cell lacking a membrane enclosed nucleus and organelles.
Are cells the same?
No, all cells are different. They have different shapes, sizes and function.
What is an organelle?
An organelle is a specialised structure with a function living within a cell.
What is cell specialisation?
- The cells in your body are specialised so they perform a particular function
- Their structure helps them to perform this role.
Examples of cell specialisation
- red blood cell- carries oxygen around the body
- -large surface area, no nucleus
- Ear cell- detect vibrations in the air
- - Contain cilia to detect vibrations
- Root hair cells- absorbs water and mineral ions from the soil
- sperm cell- fertilises an egg (female gamete)
What shape is an animal cell and a plant cell?
An animal cell is round in shape whereas a plant cell is square/rectangular in shape
what cell has a cell wall?
What is DNA?
- DNA is a self replicating material which is present in nearly all living organisms.
- It carries all genetic information.
what does DNA stand for?
what is the shape of DNA called?
A Double Helix
what 3 major parts is DNA made up of?
- -Phosphate group
- -ribose sugar
- -nitrogenous base
What are the 4 types of bases in DNA?
- 1. Adenine(A)
- 2. Thymine(T)
- 3. Guanine(G)
- 4. Cytosine(C)
what bases go together?
- Adenine(A) and Thymine(T)
- Guanine(G) and Cytosine(C)