Discussions On The Plasma Membrane

1. For each type of organism below, give a single characteristic that may be used to differentiate it from the other, related organism(s) in parentheses.

a. Foraminiferans (radiolarians)

b. Euglena (Volvox)

c. Trypanosoma (Giardia)

d. Amoeba (flagellate)

e. Physarum (Dictyostelium)

2. In what sense are sex and reproduction independent of each other in the ciliates? What does that suggest about the role of sex in biology?

3. Why are dinoflagellates and apicomplexans placed in one group of protists and brown algae and oomycetes in another?

4. Unlike many protists, apicomplexans lack contractile vacuoles. Why don't apicomplexans need a contractile vacuole?

5. Giant seaweeds (mostly brown algae) have "floats" that aid in keeping their fronds suspended at or near the surface of the water. Why is it important that the fronds be suspended in this way?

6. Why are algal pigments so much more diverse than those of plants?

7. Consider the chloroplasts of chlorophytes, euglenozoans, and red algae. For each of these groups, indicate how many membranes surround their chloroplasts, and offer a reasonable explanation in each case. Why do some dinoflagellates have more membranes around their chloroplasts than other dinoflagellates?

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Responses

  • david allen
    Why don't apicomplexans need a contractile vacuole ?
    8 years ago
  • Franziska
    How many membranes surround chloroplast of chlorophytes?
    8 years ago
  • Russom
    What sense are sex and reproduction independent of each other in the ciliates?
    8 years ago
  • dieter
    Why don,t marine protists need a contacticle vacuaole?
    8 years ago
  • Tewelde
    Why is it important that the fronds be suspended in this way?
    8 years ago
  • hana hunter
    Why don't algae need a contractile vacuole?
    8 years ago

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