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1.1 The study of life Read Online
Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.
Chapter 23: Protists MCQ Multiple Choices Questions Quiz Test Bank
23.1 Eukaryotic Origins
23.2 Characteristics of Protists
23.3 Groups of Protists
23.4 Ecology of Protists
Question: Which characteristic is shared by prokaryotes and eukaryotes?
Choices:
cytoskeleton
nuclear envelope
DNA-based genome
mitochondria
Question: Which of these protists is believed to have evolved following a secondary endosymbiosis?
Choices:
green algae
cyanobacteria
red algae
chlorarachniophytes
Question: Protists that have a pellicle are surrounded by ______________.
Choices:
silica dioxide
calcium carbonate
carbohydrates
proteins
Question: Alternation of generations describes which of the following?
Choices:
The haploid form can be multicellular; the diploid form is unicellular.
The haploid form is unicellular; the diploid form can be multicellular.
Both the haploid and diploid forms can be multicellular.
Neither the haploid nor the diploid forms can be multicellular.
Question: Which of these locomotor organs would likely be the shortest?
Choices:
a flagellum
a cilium
an extended pseudopod
a pellicle
Question: What event is thought to have contributed to the evolution of eukaryotes?
Choices:
global warming
glaciation
volcanic activity
oxygenation of the atmosphere
Question: Which protist group exhibits mitochondrial remnants with reduced functionality?
Choices:
slime molds
diatoms
parabasalids
dinoflagellates
Question: What is the function of the raphe in diatoms?
Choices:
locomotion
defense
capturing food
photosynthesis
Question: Protists with the capabilities to perform photosynthesis and to absorb nutrients from dead organisms are called ______________.
Choices:
photoautotrophs
mixotrophs
saprobes
heterotrophs
Question: Conjugation between two Paramecia produces ________ total daughter cells.
Choices:
2
4
8
16
Question: Mitochondria most likely evolved by _____________.
Choices:
a photosynthetic cyanobacterium
cytoskeletal elements
endosymbiosis
membrane proliferation
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