BIOL120 Study Guide - Final Guide: Flavin Mononucleotide, Flowering Plant, Pulvinus

• School: University of Waterloo
• Department: Biology
• Course: BIOL120
• Professor: Simon Chuong

Document Summary

Some hormones act in the same tissues where they are produced. Can act by binding a protein thereby initiating a response cascade. Response can be positive or negative; developmental or growth responses integrate. Auxins, cytokinins, gibberellins, abscisic acid, ethylene, brassinosteroids. Darwin and son, francis, founded in 1880s. Signal can pass through permeable agar but not impermeable mica. Found an active substance accumulating in the agar that caused growth on coleoptiles w/ tips removed. Structural formula is that of indoleacetic acid (iaa) There are some synthetic (more stable) and natural auxins (iaa is most common) Iaa is a modified amino acid derived from tryptophan. Produced mainly in the shoot apical meristem (sam), young leaves, and developing fruits/seeds. All tissues are capable of producing low levels of iaa. Polar transport in the shoot (basipetal) and in the root (acropetal) Main route of polar auxin in stems/leaves is via parenchyma cells. In leaves, can be transported nonpolarly in the sieve tubes of phloem.