BIOLOGY QUIZ 3/4/11
-Differences between diploblastic and triploblastic
Diploblastic and triploblastic are differing assortments of germ layers that arise in animals. Some animals
such as cnidarians and comb jellies have only two germ layers, ectoderm and endoderm, and can be
classified as diploblastic, while most other animals have three germ layers, ectoderm, mesoderm and
endoderm, and can be classified as triploblastic.
-What are the different body cavities?
Coelomates: only one with a true coelom, which is formed by mesoderm only, has a tissue layer lining
coelom and suspending internal organs, ex: segmented worm
Pseudocoelomates: body cavity is not made of only mesoderm, ex: roundworm
Acoelmates: no body cavity, ex: planarians
-protostome vs deuterostome
Protostome: spiral and determinate cleavage formation, coelom forms when masses of mesoderm split
(schizocoelous), mouth develops from blastopore
Deuterostome: radial and indeterminate cleavage formation, coelom forms when archenteron folds
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- Spring '08
- Reichler
- Biology, Nutrition, Developmental Biology, Germ layer, Mesoderm
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