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
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
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