SI Worksheet 5 Answers - BY 124 SI worksheet 5 Chapter 39 A...

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BY 124 SI worksheet 5 – Chapter 39 A circadian rhythm a. is controlled by an external oscillator b. is seen in the oscillation of the stomatal opening and production of photosynthetic enzymes in a 24-hour period c. involves an internal biological clock that is not set by daily environmental signals. d. Provides the signal for flowering e. All of the above Which of the following is not a component of the signal transduction pathway involved in the de-etiolation process. a. reception of light by a Phytochrome located in the cytosol b. inhibition of the triple response and initiation of phototropism as the shoot bends toward the light. c. production of secondary messengers such as Ca 2+ and cGMP d. cascades of protein kinases activations that phosphorylate transcription factors e. activation of genes that code for photosynthesis related enzymes. A conformational change in a substance called phytochrome _____. a. Causes a plant to bend toward light.
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