Which of the Following Is NOT True Regarding Vertebrate Segmentation

question 18

Multiple Choice

Which of the following is NOT true regarding vertebrate segmentation?

• A) The presomitic mesoderm retreats tailward as new somites are generated.
• B) The period of gene-expression oscillations in the presomitic mesoderm determines the size of each somite.
• C) If feedback delays in the gene-expression oscillations are increased, somite size will consequently increase as well.
• D) Notch-mediated lateral inhibition ensures that the segmentation clock is different in neighboring cells in the presomitic mesoderm.

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Definitions:

Drive Level

The intensity of an urge or motivation that propels an individual towards a certain behavior to satisfy a need or achieve a goal.

Arousal

Refers to the physiological and psychological state of being awoken or alert, typically involving the activation of certain brain pathways and bodily responses.

Optimal Level

Refers to the most favorable point, degree, or amount of something for a particular purpose or outcome.

Arousal Theory

A theory in psychology that suggests motivation is partly driven by a person's need to maintain an optimal level of arousal.