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Lecture Outcomes 1.docx

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Biology 1002B
Tom Haffie

Lecture Outcomes 1 1. 2 roles of light as used by life  It is a source of energy that directly or indirectly sustains virtually all organisms  Light provides organisms with information about the physical world that surrounds them 2. Characteristics of Chlamydomonas that make it a useful model system  It is a single-celled photosynthetic eukaryote  A single large chloroplast: to harvest light energy and to make energy-rich molecules through the process of photosynthesis  Eyespot: a light sensor; gather info about location and light source 3. Function of basic components of Chlamydomonas cells Organelle type Function Nucleus Contains the cell's DNA (genetic information) in the form of genes Rough Endoplasmic Consists of many interconnected membranous sacs called cisternae, onto whose Reticulum (RER) external surface ribosomes are attached. Ribosomes - Produce polypeptides Smooth Endoplasmic Consists of many interconnected membranous sacs called cisternae (without Reticulum (SER) ribosomes). Golgi Apparatus The Golgi apparatus modifies, sorts and packages macromolecules for delivery to other organelles or secretion from the cell via exocytosis Mitochondria production of energy by synthesis of ATP Chloroplasts Chloroplasts are the sites of photosynthesis within plant cells. Flagella To move Pyrenoid centers of carbon dioxide fixation within the chloroplasts Eyespot a photoreceptive organelle. Outer membrane of chloroplast. Can swim has flagella. Move to light region to get Energy. 4. Relative usefulness of various biological characteristics as measures of complexity  5. Advantages to Chlamydomonas in being phototactic.  Phototaxis is the ability of organisms to move directionally in response to a light sourc
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