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Bio 106 Chapter 39
plant responses to internal and external signals
5
Biology
Undergraduate 1
02/13/2011

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Term
etiolation
Definition
morphological adaptations for growing in darkness
Term
de-etiolation
Definition
when a shoot reaches light = stem elongation slows, leaves expand, roots elongate, and the shoot produces chlorophyl
Term
second messengers
Definition
small molecules and ions in the cell that amplify the signals and transfer it from the receptor to other proteins that carry out the response
Term
post translational modification
Definition
activates preexisting enzymes

(second messengers)
Term
transcriptional regulation
Definition
increases or decreases the synthesis of mRNA encoding a specific enzyme

(second messengers)
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