Biology-Topic 1: The Nature and Variety of Living Organisms

MRS C GREN

Acronym representing the characteristics of living organisms - Movement, Reproduction, Sensitivity, Control, Growth, Respiration, Excretion, Nutrition

Nucleus

Contains genetic material and is enclosed in a nuclear membrane

Cytoplasm

Liquid where chemical reactions occur, contains enzymes and organelles

Cell membrane

Controls what enters and leaves the cell, contains receptor molecules

Mitochondria

Site of aerobic respiration, provides energy for the cell

Ribosomes

Site of protein synthesis, found on the rough endoplasmic reticulum

Plants

Multicellular organisms with chloroplasts for photosynthesis and cellulose cell walls

Animals

Multicellular organisms without cell walls, store carbohydrates as glycogen

Fungi

Organisms with chitin cell walls, feed by extracellular digestion, may store carbohydrates as glycogen

Protoctists

Single-celled organisms with varied features like animals or plants

Prokaryotes

Organisms lacking a nucleus or membrane-bound organelles

Pathogens

Disease-causing organisms like fungi, bacteria, protoctists, or viruses