Discuss the importance of serial endosymbiosis, both primary and secondary, in the protists. 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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Metronidazole is used to treat Entamoeba infections.
Answer the following statement true (T) or false (F)
What is the role of the protein FtsZ?
A. It forms a ring at the site of constriction. B. It is involved in the attachment of DNA to the plasma membrane. C. It is responsible for the replication of DNA. D. It forms the new cell wall between daughter cells.
Long, slender, helically curved, gram-negative bacilli with tight coils are identified as belonging to which species?
a. Treponema b. Leptospira c. Borrelia d. Coxiella
Which of the following statements about symbiotic relationships are true? Check all that apply.
_____ Plant-pollinator interaction is a good example of mutualism. _____ Both mutualisms and commensalisms result from the process of coevolution. _____ It is sometimes difficult to determine if a specific relationship is mutualism, commensalism, or parasitism. _____ Parasites can sometimes influence the behavior of their hosts to facilitate completion of their life cycles. _____ Mutualists sometimes become parasites.