Lesson 1: Introduction to cells Flashcards
Cells
the basic units of life
Unicellular
organisms made up of one cell.
Examples of unicellular
bacteria, archaea and protozoa
Multicellular
Organisms made up of 2 or more cells.
Examples of multicellular
Animal, plants and fungi
The cell theory
- All living things are made up of one or more cells.
- Cells are the basic units of life.
- All cells come from other cells.
Four basic structures common to all cells
Cytosol
Plasma membrane
Ribosomes
Genetic material
The functions of life
Metabolism
Reproduction
Sensitivity
Homeostasis
Excretion
Nutrition
Growth
Four atypical cell structures that challenge the cell theory
Striated muscle cells
Aseptate fungal hyphae
Sieve tube elements
Red blood cells
Striated muscle cells
more than one nucleus
Aseptate fungal hyphae
continuous cell structure.
Sieve tube elements
relying on local companion cells for survival.
Red blood cells
no nucleus, mitochondria and genetic material
Homeostasis
Maintaining a stable internal environment
