Exam 27: Protists

One of the fish in your aquarium dies. Adding which protist to the water would allow you to avoid flushing the dead fish by speeding its decay?

Diatoms are mostly asexual members of the phytoplankton. They obtain their nutrition from functional chloroplasts, and each diatom is encased within two porous, glass-like valves. Which question would be most important for one interested in the day-to-day survival of individual diatoms?

Protists and bacteria are grouped into different domains because ________.

Encouraging the growth (via nutrient fertilization) of photosynthetic protists in marine environments may help reduce global warming because ________.

Amoeboid movement via long slender pseudopodia is characteristic of ________.

According to the endosymbiotic theory, why was it adaptive for the larger (host) cell to keep the engulfed cell alive, rather than digesting it as food?

Protists from which of the following taxonomic groups are most likely to lead to paralytic shellfish poisoning?

A snail-like, coiled, porous test (shell) of calcium carbonate is characteristic of ________.

When a mosquito infected with Plasmodium first bites a human, the Plasmodium ________.

Use the following information to answer the question(s) below. The mechanism of cell crawling in protist species is not well defined. Pseudopodia extension involves interactions between actin and myosin (the same molecules that are involved in vertebrate muscle contraction). However, prior to the study described below, no one had provided convincing data that actin and myosin were actually involved in cell crawling in protists. Anatomical studies had identified the cytoskeletal protein actin just below the surface of the cell membrane in several species of protist, but physiological studies had failed to show a functional link between actin, myosin, and cell crawling. In a study by N. Poulsen et al. (Diatom gliding is the result of an actin-myosin motility system, Cell Motility and the Cytoskeleton 44 (1999):23-22), researchers tested whether motility in a particular species of diatom involves interactions between actin and myosin. -Refer to the study by Poulsen et al. and the accompanying figure. The data graphed in the figure could be an artifact if latrunculin A kills this species of diatoms (that is, that may be why the cells are not moving). Which of the following would be the best evidence that latrunculin A is NOT killing the cells?

All protists are ________.

By examining the phylogenetic tree diagrammed in the accompanying figure, what conclusion can you draw about the species G. microti?

In examining a protist, you notice that it lacks a cell wall, and has movement with cytoplasmic streaming. These data allow you to infer that the species belongs to which of the following protist groups?

Which of the following eukaryotic lineages contains species that all lack functioning mitochondria?

A particular species of protist has obtained a chloroplast via secondary endosymbiosis. You know this because the chloroplasts ________.

Which of the following might be a result of adding a secondary consumer to the aquatic ecosystem in the accompanying illustration?

Imagine that there are 25 different species of protists living in a tide pool. Some of these species reproduce both sexually and asexually, and some of them can reproduce only asexually. The pool gradually becomes infested with disease-causing viruses and bacteria. Which species are more likely to thrive in the changing environment?