Early animal life Flashcards
1
Q
what are the three types of junctions between cells?
A
- adhesion junction
- tight junction
- gap junction
2
Q
what are the two main types of feeding methods?
A
- autotrophy (organisms that produce their own food from organic molecules
- heterotrophy ( organisms which derive energy from other living organisms)
3
Q
what are the definitions of Metazoan?
A
-eukaryotic: nucleus and membrane bound organelles
-multicellular
- different cells with different functions
- cell organisation into tissues and organs
-cell junctions to form body wall
4
Q
ectoderm
A
germ layer covering the embryo’s surface
5
Q
endoderm
A
the innermost germ layer
6
Q
diploblastic
A
animals have ectoderm and endoderm
7
Q
triploblastic
A
animals also have an intervening mesoderm layer
8
Q
what are the three main groups of ediacarans?
A
- Frond-like
rangeomorphs - Radially symmetrical
organisms - Worm-like bilaterally
symmetrical.
9
Q
what are collar cells?
A
pump to bring water into sponges
10
Q
what are collar cells composed of?
A
- flagellum for transportation and feeding
- collar made of cillia
- cell body
- nucleus
11
Q
A
