Chapter 28 Test (1-10) Flashcards
Which protist group includes the dinoflagellates, apicomplexans, and ciliates?
A) diatoms
B) euglenids
C) stramenopiles
D) alveolates
E) protozoa
D) alveolates
Which group has caused such agricultural problems as downy mildew, potato blight, and an avocado disease?
A) slime molds
B) protozoa
C) oomycetes
D) diatoms
E) cyanobacteria
C) oomycetes
According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate?
A) from infoldings of the plasma membrane, coupled with mutations of genes for proteins in energy-transfer reactions
B) when a protoeukaryote engaged in a symbiotic relationship with a protocell
C) from engulfed, originally free -living proteobacteria
D) from the nuclear envelope folding outward and forming mitochondrial membranes
E) by secondary endosymbiosis
C) from engulfed, originally free -living proteobacteria
When a mosquito infected with Plasmodium first bites a human _____.
A) the Plasmodium cells infect the human liver cells
B) the Plasmodium cells cause lysing of the human red blood cells
C) the Plasmodium oocyst undergoes meiosis
D) the Plasmodium gametes fuse, forming an oocyst
A) the Plasmodium cells infect the human liver cells
An individual mixotroph loses its plastids, yet continues to survive. Which of the following most likely accounts for its continued survival?
A) It has an endospore.
B) It relies on photosystems that float freely in its cytosol.
C) It is protected by a case made of silica.
D) It engulfs organic material by phagocytosis or by absorption.
E) It must have gained extra mitochondria when it lost its plastids.
D) It engulfs organic material by phagocytosis or by absorption.
Encouraging the growth (via nutrient fertilization) of photosynthetic protists in marine environments may help reduce global warming. Why?
A) because photosynthetic protists fix atmospheric carbon dioxide, decreasing atmospheric CO2 levels
B) because photosynthetic protists form the base of many marine food chains
C) because the increased oxygen consumption by large populations of photosynthetic protists will promote land plants to speed up photosynthesis, thus removing CO2 from the atmosphere
D) because photosynthetic protists would release a lot of oxygen, and fertilizing them would increase levels of oxygen in the atmosphere
A) because photosynthetic protists fix atmospheric carbon dioxide, decreasing atmospheric CO2 levels
Free-floating, photosynthetic, unicellular protists include:
A) phytoplankton.
B) ciliates.
C) amoebas.
D) cyanobacteria.
E) brown algae.
A) phytoplankton.
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)
A) red alga.
B) diatom.
C) dinoflagellate.
D) apicomplexan.
E) radiolarian.
B) diatom.
Why is the filamentous morphology of the water molds and fungi considered a case of convergent evolution?
A) Water molds evolved from filamentous fungi.
B) Body shape reflects ancestor-descendant relationships among organisms.
C) In both cases, filamentous shape is an adaptation for the absorptive nutritional mode of a decomposer.
D) Filamentous body shape is evolutionarily ancestral for all eukaryotes.
E) Both the first and second responses above are correct
C) In both cases, filamentous shape is an adaptation for the absorptive nutritional mode of a decomposer.
A parasitic protist that presents a major health problem to backpackers and hikers if they drink unfiltered stream or lake water is:
A) Didinium.
B) Giardia.
C) Trypanosoma.
D) Plasmodium.
E) Pfiesteria.
B) Giardia.
