Formation of the Endoderm and Mesoderm During Gastrulation in Frogs

question 170

Multiple Choice

Formation of the endoderm and mesoderm during gastrulation in frogs results from

• A) involution.
• B) migration of cells that have broken free within the blastocoel.
• C) formation of columnar cells at the vegetal pole.
• D) invagination.
• E) migration of secondary mesenchyme cells.

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Definitions:

Contemplation Stage

A phase in the transtheoretical model of behavioral change during which an individual is aware a problem exists and is seriously thinking about overcoming it but has not yet made a commitment to take action.

Addiction

A physical or a psychological dependence, or both, on a drug.

Self-actualization

The realization or fulfillment of one's talents and potentialities, considered as a drive or need present in everyone.

Transcendence

The experience of surpassing normal physical or mental limitations.