BIOL 111 Part 1 Questions
Why is albumen viscous?
Albumen is a protein that makes water viscous.
Why is the morula and the zygote the same size?
As cleavage is occurring, the cells get smaller. This is cell division without growth.
In the sea star, does the blastopore become the mouth or the anus?
As sea stars are deuterostomes, the blastopore becomes the anus.
What has to happen to the ectoderm in order for a neural tube to form?
Folds have fused to become an outer layer and the tube.
Does growth occur during cleavage?
No.
Why would you not expect to see a sea star's egg to be heavily laden with yolk?
The embryo is free-living and develops quickly to a stage where it gets nourished on its own.
What two organ systems develop first in a chick?
The nervous and muscular systems develop first in a chick.
What is the function of the notocord in a chick?
The notocord becomes the vertebral column by
What is the formative function of the notocord?
The notocord induces formation of the neural tube.
Why does the sea star unfertilized egg not have an animal and a vegetal pole?
The sea star has a small amount of yolk equally distributed throughout the cell.
How does the size of the two- to eight-cell stage of a sea star compare to the size of the unfertilized egg?
They are the same size.
Why are the ectoderm and endoderm called germ layers?
They give rise to various structures in the adult.
