Chapter 27

Which of the following is a characteristic of protists that is also found in at least one other group? a. division by binary fission b. multicellular structures c. complex developmental stages d. peptidoglycan cell walls e. organelles and reproduction by meiosis/mitosis

Which of the following is not found among the protist groups? a. life cycles b. contractile vacuoles c. pellicles d. collagen e. pseudopodia

A member of this group can cause urinary infections and be spread by sexual intercourse. The group is characterized by a flagellum buried in a fold of the cytoplasm that allows the organisms to move through thick and viscous fluids of humans. The group is: a. Ciliophora. b. Apicomplexa. c. Amoebozoa. d. Parabasala. e. Diplomonadida.

The greatest contributors to protist fossil deposits, and probable source of oil in many oil deposits, are: a. Oomycota. b. Chrysophyta. c. Bacillariophyta. d. Sporophyta. e. Alveolata.

The group with the distinguishing characteristic of gas-filled bladders and a cell wall composed of alginic acid, which is used by humans to thicken such diverse products as ice cream and floor polish, is: a. Chrysophyta. b. Phaeophyta. c. Oomycota. d. Bacillariophyta. e. none of the preceding.

Plasmodium is transmitted to humans by the bite of a mosquito (Anopheles). Its life cycle is characterized by spores, gametes, and cysts that can "hide" in human cells. This infective protist belongs to the group: a. Apicomplexa. b. Archaeplastida. c. Dinoflagellata. d. Oomycota. e. Ciliophora.

Tripping on a rotten log, a hunter notices a mass resembling mucus that appears to be moving slowly toward what appear to be brightly colored fruiting bodies. The organisms in the mass are: a. amoebas in the group Rhizaria. b. slime molds. c. red algae. d. green algae. e. charophytes.

Endosymbioses that lead to the evolution of euglenoids and, separately, the evolution of chlorarachniophytes were the result of the combining of: a. two ancestral nonphotosynthetic prokaryotes. b. two ancestral photosynthetic prokaryotes. c. a nonphotosynthetic eukaryote with a photosynthetic eukaryote. d. a photosynthetic prokaryote with a nonphotosynthetic eukaryote. e. mitochondria with an already established plastid.

Design an experiment to demonstrate whether the flagellated protist Euglena is phototropic, that is, is attracted to and moves toward light. Also propose a follow-up experiment (on the assumption of a positive result) to determine the wavelength range and light intensity range sufficient to cause phototropic movement.