Summary IGCSE Biology Triple Notes (The Nature and Variety of Living Organisms) EDEXCEL

IGCSE Biology Triple Science Notes
The Nature & Variety of Living Organisms
Contents:

MRS H GREN

Microorganisms

Enzymes

Biological Molecules

Food Tests

Diffusion

, MRS H. GREN is the list of rules for something to be considered alive:

Movement

Respiration

Sensitivity

Homeostasis

Growth

Reproduction

Excretion

Nutrition

Virus:

● Unicellular
● RNA or DNA
● Protein Coat
● Always pathogenic
● HIV
● Cold
● Influenza

Bacteria:

● Cell Wall
● No distinct nucleus
○ Nucleoid
● Unicellular
● Sometimes pathogenic
● Tuberculosis

Protoctist:

● Variable
● Can be similar to plants or animals
○ Algae
○ Protozoa
● Can be unicellular or multicellular
● Sometimes pathogenic
● Chorella
● Amoeba
● Plasmodium

Fungi: