Biology 1A Oct 6, 1998
Lecture 11 - Algae I
Page Contents :
Reading Assignment:
Overview of Lecture:
What are algae?
There are six major groups of algae.
Euglenids are photosynthetic flagellates.
Unicellular organisms face many unique challenges.
Dinoflagellata.
Overview of Lab:
(A bullet indicates a handout.)
- Algal Identification and Morphology.
Lecture Outline:
I. What are algae?
II. There are six major groups of algae.
III. Euglenids are photosynthetic flagellates.
IV. Unicellular organisms face many unique challenges.
V. Dinoflagellata.
Vocabulary:
| accessory pigment | | | |
fucoxanthin | | | |
reservoir |
| alga | | | |
kelp forest | | | |
Reynolds number |
| algal bloom | | | |
marine | | | |
seaweed |
| alginate | | | |
paramylon | | | |
silica |
| beta carotene | | | |
pectinate | | | |
stigma |
| benthos | | | |
pellicle | | | |
terrestrial |
| bioluminescence | | | |
photosynthate | | | |
theca |
| cellulose | | | |
phytoplankton | | | |
unicellular |
| chlorophyll a | | | |
pigment | | | |
viscosity |
| cingulum | | | |
plankton | | | |
xanthophyll |
| estuary | | | |
plastid | | | |
zooplankton |
| flagellae | | | |
red tide | | | |
zooxanthellae |
| freshwater | | | |
reef | | | |
|
Study Questions:
- What are algae?
- Where do algae grow?
- What are pigments? What pigments are found in all algae? How do pigments affect the depth at which algae prefer to live?
- Define "plankton". What part of the plankton are algae? What are the three most important groups of algal plankton?
- How do algae contribute to the habitats of animals? to their reproduction? to their survival?
- What are alginates and what are they used for commercially?
- How do we know that algae is a polyphyletic group? What does this mean?
- How many groups of algae are there? What are they?
- What characteristics are most useful for recognizing algal groups?
- What is a "photosynthate"? What are some examples of photosynthates? To which of the four classes of biological molecules do most photosynthates belong? Why are photosynthates important to algae?
- How many times have plastids evolved? How many times have chloroplasts evolved?
- What is the composition of a euglenid pellicle? Describe its properties. How is a pellicle different from a cell wall?
- Draw a euglenid and its major organelles. In which direction would it swim? How would it reproduce?
- Explain the origin of the euglenid chloroplast. What evidence supports this origin?
- What are two difficulties of being unicellular?
- How does the size of an organism affect its ability to move?
- How does viscosity of an organism's environment affect its ability to move?
- How is the dinoflagellate theca like a cell wall? How is it different?
- Draw a dinoflagellate and show its flagellae. How does each flagellum control cell movement?
- Why do dinoflagellates have chromist-like pigments?
- How do the chromosomes of dinoflagellates differ from those in other eukaryotes?
- What causes a "red tide"? Why are red tides dangerous? How do they affect fish? molluscs? people? How might a red tide affect birds that eat fish?
- When are red tides most likely to occur?
- What are zooxanthellae, and how are they important?
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