Unit 3: Biodiversity Overview Flashcards
What are some characteristics of the domain Prokarya?
- Mostly microbial and are all virtually unicellular
- Have a cell membrane and cell wall, but lack true organelles and nucleus
- Smaller than eukaryotes but more abundant
- Some are decomposers
- Bacteria are pathogenic but archaea are not
What are some prokaryotic features?
- Different shapes
- Can only move forward/backward
- Have some specialized membranes
- Have a ring of DNA
Describe prokaryotic reproduction and adaptations.
- Most divide every 1-3 hours
- New generations can be produced in 20 mins
- Some form endospores when exposed to harsh environments
- Can adapt quickly to environment via natural selection
Describe characteristics of protists.
- Unicellular
- Larger than bacteria
- Have organelles
- Most diverse of all eukaryotes
- Can reproduce sexually or asexually
The Theory of Endosymbiosis states that a(n) ____ organism engulfed other cells and these cells became _______.
Unicellular
Organelles
State what the two forms of protist feeding are and what they do.
- Ingestive: eating live or dead organisms or scavenging loose bits of organic debris by sweeping/engulfing
- Absorptive: taking nutrients directly from environment
How do protists move?
- Crawl as amoeboid
- Swim with a flagellum
- Swim with cilia
Which phyla of animals lack tissues?
Porifera
Which phyla of animals are unicellular?
Choanoflagellates
Which phyla of animals have radial symmetry?
Cnidaria
Ctenophora
Adult Echinodermata
Which phyla of animals have bilateral symmetry?
Acoelomorpha
Rotifera
Platyheminthes
Annelida
Mollusca
Nematoda
Arthropoda
Echinodermata (larval)
Chordata
Radial Symmetry
Symmetry around a central axis
Bilateral Symmetry
Symmetry based on two halves (left and right)
Coelom
Main body cavity that surrounds digestive tract and other organs
Which phyla of animals have no coelom?
Porifera
Cnidaria
Ctenophora
Acoelomorpha
Platyhelminths
Which phyla of animals have a true coelom?
Annelida
Mollusca
Arthropoda
Echinodermata
Chordata
Prostomes
Organism where the mouth develops before the anus
Deuterostomes
Organism where the anus develops before the mouth
Which phyla of animals are protostomes?
Acoelomorpha
Rotifera
Platyhelminths
Annelida
Mollusca
Nematoda
Arthropoda
Which phyla of animals are deuterostomes?
Echinodermata
Chordata