Classic Experiments Suggested That a Floral Stimulus, Florigen, Could Move

question 40

Multiple Choice

Classic experiments suggested that a floral stimulus, florigen, could move across a graft from an induced plant to a noninduced plant and trigger flowering. Recent evidence using Arabidopsis has recently shown that florigen is probably

• A) a phytochrome molecule that is activated by red light.
• B) a protein that is synthesized in leaves, travels to the shoot apical meristems, and initiates flowering.
• C) a membrane signal that travels through the symplast from leaves to buds.
• D) a second messenger that induces Ca⁺⁺ ions to change membrane potential.
• E) a transcription factor that controls the activation of florigen-specific genes.

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Definitions:

Primary Emotion

Basic emotions that are universally recognized and experienced by people regardless of culture, including happiness, sadness, fear, disgust, surprise, and anger.

Secondary Emotions

Emotions that are complex and involve a combination of primary emotions, such as guilt, shame, and pride.

Parenthood

The state or experience of being a parent, involving the responsibilities and duties of raising children.

Physiological

Relating to the branch of biology that deals with the normal functions of living organisms and their parts.