Signal Transduction: Light Induced Cellular Change

The video explains how light affects plant movement, flowering, and growth through signal transduction. This process involves three stages: reception, where light signals are received by photoreceptors; transduction, where intracellular pathways are activated; and response, where transcription factors are activated, leading to protein synthesis. These proteins, in turn, trigger specific plant responses such as stem bending and flower bud initiation.

What is the initial stage of signal transduction in plants called?

• Reception

• Activation

• Transduction

• Response

Which molecule is produced in one of the transduction pathways that activates an enzyme?

• Chlorophyll

• NADPH

• ATP

• Cyclic GMP

What role do calcium ions play in the transduction phase?

• They activate Kinase B

• They deactivate photoreceptors

• They produce mRNA

• They bind to DNA

What happens when transcription factors are activated in the response stage?

• Calcium ions are released

• Photoreceptors change shape

• Light is absorbed

• Genes undergo transcription

What is the function of response proteins in plants?

• They deactivate enzymes

• They produce chlorophyll

• They absorb light

• They trigger specific plant responses