BIOL 1020 Lecture 17: Lecture 17

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1020
• Professor: Joy Stacey

Document Summary

Which of the following correctly characterized the relationships between the ph of the thylakoid space, the stroma and/or the cytosol of a plant cell? ph lower in thylakoid space, ph high in stroma. The ph within the thylakoid is less than that of the stroma. (h+ ions) Tissue of various systems - response to external cues. Signals sent through messenger molecules (ligands) -sent by secretory cells. Multicellular and unicellular organisms universal mechanisms: ancestral signaling molecules evolved in prokaryotes chemical signals that are really important in transferring messages. Quorum sensing: individuals can sense the population size via the chemical secreted. When food becomes scarce: starving cells secrete molecule that attracts other cells: neighboring cells aggregate, form fruiting body. Makes spores that can survive until conditions improve. When conditions improve spores break off and make more bacteria. Important in embryonic development and immune response (blood cells) Across a synapse- neurotransmitters (between nerve cells) signals transmitted between nerves.