Biology

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Author:
Cgray
ID:
302944
Filename:
Biology
Updated:
2015-05-19 03:37:23
Tags:
biology
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Description:
biology revision
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  1. What is a cell?
    Give example
    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
  2. 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
  3. What is a Eukaryote?
    organisms with a membrane enclosed nucleus and organelles
  4. What is a prokaryote?
    Organisms with a cell lacking a membrane enclosed nucleus and organelles.
  5. Are cells the same?
    No, all cells are different. They have different shapes, sizes and function.
  6. What is an organelle?
    An organelle is a specialised structure with a function living within a cell.
  7. 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.
  8. 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)
  9. 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
  10. what cell has a cell wall?
    Plant cells
  11. What is DNA?
    • DNA is a self replicating material which is present in nearly all living organisms.
    • It carries all genetic information.
  12. what does DNA stand for?
    Deoxyribo-nucleic-acid
  13. what is the shape of DNA called?
    A Double Helix
  14. what 3 major parts is DNA made up of?
    • -Phosphate group
    • -ribose sugar
    • -nitrogenous base
  15. What are the 4 types of bases in DNA?
    • 1. Adenine(A)
    • 2. Thymine(T)
    • 3. Guanine(G)
    • 4. Cytosine(C)
  16. what bases go together?
    • Adenine(A) and Thymine(T)
    • Guanine(G) and Cytosine(C)

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