Test #1 Flashcards
1
Q
tissue
A
- cells that function together
- none; sponges
- diploblast; two embryonic cell layers (ectoderm and endoderm), jellyfish
- triploblast; three embryonic cell layers, flatworms
2
Q
cleavage
A
- first few rounds of mitosis
- protostome; spiral and determinate, cells that don’t “line up”, cells become specialized
- deuterstome; radial and immdetermiate, edges line up, not specialized yet
3
Q
Cambrian Explosion
A
- 535-525 million years ago
- drastic increase in number of species
- hard body coverings which make fossils
4
Q
Cambrian Explosion
A
- 535-525 million years ago
- drastic increase in number of species
- hard body coverings which make fossils
- may have increase in predator-prey relationships
5
Q
Radial Symmetry
A
- regardless of a cut on an organism, two halves will always reflect each other
- jellyfish
6
Q
Bilateral Symmetry
A
- one central axis where a cut will have two halves that reflect each other
- human, earthworm
7
Q
Cephalization
A
toward head, anterior end, forms head and brain during development
8
Q
Ectoderm
A
organisms that rely on external environment to regulate body temperature
9
Q
Endoderm
A
organisms that produce heat via internal metabolic processes
10
Q
Ectodermic
A
organisms that rely on external environment to regulate body temperature
11
Q
Endodermic
A
organisms that produce heat via internal metabolic processes
12
Q
Diploblastic
A
two embryonic cell layers (ectoderm and endoderm), jellyfish
13
Q
Diploblastic
A
two embryonic cell layers (ectoderm and endoderm), jellyfish
14
Q
Triploblast
A
three embryonic cell layers, flatworms
15
Q
Coelom
A
- body cavity
- have to be triploblastic
- acoalomates; no presence of a coelom, no body cavity between wall and internal canal, flatworm
- coelomates; body cavity present