A Researcher Experimenting with Amphibian Embryos Is Able to Prevent

question 239

Multiple Choice

A researcher experimenting with amphibian embryos is able to prevent the expression of the transcription factor Goosecoid in early organizer cells.The most likely result of this intervention is that

• A) anterior growth factors will be suppressed.
• B) growth factors will be activated that are necessary for head formation.
• C) the head will form but the trunk and tail will not form.
• D) certain growth factors will be suppressed and the head will form.
• E) growth factors preventing head formation will remain active.

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Definitions:

Ego

In psychology, it represents the part of the mind that mediates between the conscious and unconscious and is responsible for reality testing and a sense of personal identity.

Superego

Part of the personality in Freudian psychoanalysis comprised of the internalized ideals and moral standards we acquire from parents and society.

Anal Retentive

Gaining pleasure from retaining the bowels.

Self

The individual's awareness of their own identity and personal characteristics, often including self-concept, self-esteem, and self-image.