Chapter 39 active reading guide answers 2026

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Phototropismthe directional bending of a plant toward or away from a light sourceis a response to blue wavelengths of light. Positive phototropism is growth towards a light source (Figure 2), while negative phototropism (also called skototropism) is growth away from light.
Phototropins (PHOT1 and PHOT2) serve as sophisticated blue light sensors in plants. These cytosolic and plasma membrane-associated photoreceptors regulate key physiological responses, such as phototropism, chloroplast movement, and adaptation to oxidative stress.
Cryptochromes 1 and 2 are photolyase-like receptors that regulate hypocotyl growth and flowering time; phototropin mediates phototropism in response to blue light. In addition, phytochrome A has also been found to mediate various blue-light responses.

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During the past decade, molecular genetic studies using Arabidopsis as a model system have identified three blue-light receptors: cryptochrome 1, cryptochrome 2 and phototropin, which regulate primarily hypocotyl inhibition, flowering time and phototropism, respectively.
Key points. Animal behavior includes all the ways animals interact with other organisms and the physical environment. Behavior can also be defined as a change in the activity of an organism in response to a stimulus, an external or internal cue or combo of cues.
Phototropins (phot1 and phot2) mediate multiple blue light responses in Arabidopsis, including phototropism, chloroplast movements, leaf flattening, leaf positioning, stomatal opening, and rapid inhibition of hypocotyl growth (15).

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