Introduction to Zoology Flashcards
What are the 3 domains?
Eukarya, Bacteria, Archaea
What are features of archaea?
Single celled
No nucleus
Most are extremophiles
What are the features of bacteria?
Single celled
No nucleus
Specialised cell membranes
Unique mRNA
What are the features of eukarya?
Many are multi-cellular
Have a membrane bound nucleus
Name some features of animals
Eukaryotes
Multicellular
Heterotrophic
Muscle and nerve tissue unique to animals - not all have these
Lack cell walls - held by collagen (which forms the ECM)
Unique cell junctions
What are the unique cell junctions?
Tight Junctions = continuous belt that connects two cells together
Desmosomes = anchoring junction that connects two cells at ONE point
Gap Junctions = communicating junctions that allow small molecules to pass between cells
What was the likely common ancestor of animals?
A choanoflagellate protozoan
Single flagella surrounded by a collar of microvilli used for filter feeding
Structure of single flagella similar to that of cilia of primitive animals
Similar mitochondrial structure
Similar DNA
Name the 15 main phyla of animals
Order of the taxonomic nomenclature
Domain
Kingdom
Phylum
Class
Order
Family
Genus
Species