Discuss the role of protists in both primary and secondary serial endosymbiosis. What will be an ideal response?
Concepts to Consider: Mitochondria and chloroplasts originated from endosymbionts.
Primary endosymbiosis was responsible for the chloroplasts of red algae, green algae, and
land plants. Secondary endosymbiosis was responsible for the chloroplasts of euglenoids,
dinoflagellates, diatoms, golden algae, and brown algae (and apicomplexans have related
nonfunctional chloroplasts). Certain dinoflagellates and green algae are endosymbionts of
invertebrates. Forams contain algal endosymbionts/
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You add an unknown phage to a mixture of F+ and F- cells of E. coli and plate out the bacteria. The bacterial colonies that grow are all F-. How can you explain this phenomenon?
A. The phage bound to a receptor on the sex pilus, and therefore only infected the F+ cells (leaving the F- cells alone). B. The phage bound to a receptor on the F- cells, leaving only them alive and allowing the F+ cells to die off. C. The phage integrated (lysogenized) the F- cells, giving them a selective advantage over the F+ cells. D. F+ cells are uniquely susceptible to phage attack for unknown reasons.
Which of the following is a tenet of the Cell Theory?
1) All organisms are composed of one or more cells. 2) The cell is the structural unit of life. 3) Cells can arise only by division from a preexisting cell. 4) Cells divide only by fission. A) 1 B) 2 C) 3 D) 4 E) 1, 2 and 3
Which of the following is NOT a desirable characteristic of a model organism used to study development?
A. large oocytes B. short generation time C. large genome D. produces many offspring E. small size
If these fly species lost the ability to fly independently of each other (the result of separate mutation events in each lineage), then the flightless condition in these species could be an example of
A) adaptive radiation. B) species selection. C) sexual selection. D) allometric growth. E) habitat differentiation.