BI111 Study Guide - Final Guide: Guanine, Protein Kinase, Seed Dormancy
Document Summary
Plants respond to many signals from their environment. Gravitropism responding to direction of gravity: can either be positive (toward the direction of gravity e. g. roots, negative (away from direction of gravity e. g. shoots, mediated by differential rates of cell elongation. Phototropism is the result of blue light photons being received by phototropins. Seconds messengers include: cyclic guanosine monophosphate (cgmp) and calcium. Once the nucleus has received a message from external signal, response can occur in 1 of. The changes are called transcriptional regulation because they involve changes in amount of rna that"s transcribed from a gene, which in turn alters amount of translated protein. Plants defense mechanisms against herbivores & pathogens take on many forms. Can be short term responses as well as long term. Structural defenses physical structures formed to deter herbivores e. g. thorns and prickles on thistle leaves: some plants use chemical defenses to deter their enemies, can cause a rash (like poison ivy), odd taste.
