Exam 28: Protists

Diatoms are mostly asexual members of the phytoplankton. Diatoms lack any organelles that might have the 9 + 2 pattern. They obtain their nutrition from functional chloroplasts, and each diatom is encased within two porous, glasslike valves. Which question would be most important for one interested in the day-to-day survival of individual diatoms?

Which of the following was derived from an ancestral cyanobacterium?

If true, which of the following would be most important in determining whether P. chromatophora's cyanelle is still an endosymbiont, or is an organelle, as the term cyanelle implies?

Reinforced, threadlike pseudopods that can perform phagocytosis are generally characteristic of which group?

Which of the following statements about dinoflagellates is true?

Biologists have long been aware that the defunct kingdom Protista is polyphyletic. Which of these statements is most consistent with this conclusion?

Which pair of alternatives is highlighted by the life cycle of the cellular slime molds, such as Dictyostelium?

During passage through the large intestine, a trophozoite will often secrete a case around itself, forming a cyst. Cysts contain four haploid nuclei. When cysts "hatch" within a new host, two trophozoites are released. Thus, which of the following must happen within the cyst, prior to hatching? 1)meiosis 2)nuclear division 3)S phase 4)binary fission

A biologist discovers an alga that is marine, multicellular, and lives at a depth reached only by blue light. This alga probably belongs to which group?

Which group is incorrectly paired with its description?

Given its mode of reproduction and internal structures, which of the following should be expected to occur in Giardia at some stage of its life cycle? 1)separation (segregation)of daughter chromosomes 2)crossing over 3)meiosis

Which of the following pairs of protists and their characteristics is mismatched?

Which of the following is correctly described as a primary producer?

A gelatinous seaweed that grows in shallow, cold water and undergoes heteromorphic alternation of generations is most probably what type of alga?

You are given the task of designing an aquatic protist that is a primary producer. It cannot swim on its own, yet must stay in well-lit surface waters. It must be resistant to physical damage from wave action. It should be most similar to a(n)

Why is the filamentous morphology of the water molds considered a case of convergent evolution?