Biology 1002B Lecture Notes - Lecture 16: Repressor, Microtubule, Chloroplast
15 Mar 2013
School
Department
Course
Professor
Document Summary
Apotosis gene activation from receptors signals on surfaces of marked cells e. g. separate fingers & toes. Caspases any group of proteases that mediate by encoding a protease that degrades cell structures: likelihood that modern multi-cellular life forms are monophyletic. False, volvox genus is not monophyletic: 4 or 5 independent lines have proven multicellularity has evolved multiple times, characteristics of volvocine algae that make them a useful model system to study transition to multicellularity. Volvox and clamy shared a common ancestor 50 mya (relatively recent) Single cell group spherical (cell associates with cell wall on outside) multicellularity (specialize) Ecm (extracellular matrix) transparent stuff that holds them: relative structure/function of chlamydomonas vs. volvox cells. Unicellular chlamydomonas: has to do everything, loses its flagella when it asexually divides, a little developmental plasticity. Volvox: transparent extracellular matrix (ecm) that holds sphere, many somatic cells and a few dozen of reproductive cells, general process of volvox asexual reproduction; role of somatic vs gonidial cells.
