BIOL 115 Lecture Notes - Lecture 18: Apical Dominance, Auxin, Motility
25 Jun 2016
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Document Summary
Biting by a specific insect sends signals to the plant, which sends volatile chemical signals to the predator of the insect pest. The insect predator come and eats the insect: cutting or grazing by herbivores, cutting and herbivory grazing removes apical dominance by auxin. Therefore, side branches come out from the bottom of the shoot. Animal characteristics: eukaryotic, heterotrophic, multicellularity, no cell walls, motile at some life stage, diploid somatic cells, diplontic life cycle, * most animals have tissues. Multicellularity: having multiple cells means, cells can become specialized to carry out specific functions, organisms can grow in size (and have more complex functions) If you are one large cell, you have a diffusion problem due to low sa:v ratio. Materials can diffuse throughout smaller cells more quickly. No cell walls: types of structural support, hydrostatic skeleton. Muscles contract against fluid-filled cavity (worms: exoskeleton. Nonliving covering that does not grow with the animal. Ecdysozans molting animals, eg dragonflies: endoskeleton.
