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16 Cards in this Set
- Front
- Back
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Prokaryotic Organisms |
Bacteria or Archea • They have no nucleus, mitochondria, or any other membrane-bound organelles |
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Autotrophic Organisms |
Algae and Plants • They are able to make their own food (e.g. photosynthesis) |
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How to identify organisms |
Arrangement of body parts: • Asymmetry- irregular shape • Radial Symmetry- body parts radiate from a central point • Pentamerous Symmetry- 5 pointed radial organisation • Bilateral Symmetry- Two halves that are mirror images |
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Radial Symmetry |
• Associated with sedentary, immobile, sessile, or slow-moving animals • 360 degree sensory field: no preferred direction of motion |
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Bilateral Symmetry |
Associated with mobility and preferred orientation • Directionality • Cephalization |
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Porous |
Having minute interstices and holes through which liquid or air may pass |
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Mollusca |
A phylum of invertebrates with a soft unsegmented body and usually covered with a double or single shell, or having an internal shell |
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Radula |
A uniquely molluscan feeding rasplike organ, odontophore or lingual ribbon, armed with chitinous denticles, found in nearly all mollusks, except bivalves |
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Annelida |
A phylum of segmented or cylindrical ringed worms |
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Arthropoda |
A phylum of invertebrates that contains the chitinous segmented, scoskeletoned, jointed-legged animals • All Arthropoda have segmented bodies divided into a head, thorax and abdomen. They all have jointed appendages |
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What is an exoskeleton |
It is an external skeleton, it serves not only as a protective covering over the body, but also as a surface for muscle attachment, a water-tight barrier against desiccation, and a sensory interface with the environment |
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Shell vs Exoskeleton |
The shell of molluscs is also an external skeleton, but has different characteristics compared to the true exoskeleton of Arthropods. It is secreted by special cells. When the mollusc grows, so does the mantle and the shell with it, so molluscs do not need to melt |
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Phylum Arthropoda- Chulicerata |
Chelicera: anterior most pair of appendages, functioning in grasping, holding, tearing, crushing or piercing; pincer-like in scorpions, but modified as poison fangs in spiders and as biting mouth parts of ticks Pedipalp: the second pair of cephalothoratic appendages |
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Phylum Arthropoda- Myriapoda |
1 pair of antennae many pairs of legs |
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Phylum Arthropoda- Hexapoda |
• Head- 1 pair of antennae mouthparts, eyes • Thorax- 3 pairs of legs, 1 or 2 pairs of wings • Abdomen- No appendages |
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Phylum Arthropoda- Crustacea |
Crustaceans are the only arthropods that have two pairs of antennae They also have a pair of mandibles and two pairs of maxillae |
