What event is thought to have contributed to the evolution of eukaryotes?
- global warming
- volcanic activity
- oxygenation of the atmosphere
Which characteristic is shared by prokaryotes and eukaryotes?
- nuclear envelope
- DNA-based genome
Mitochondria most likely evolved by _____________.
- a photosynthetic cyanobacterium
- cytoskeletal elements
- membrane proliferation
Which of these protists is believed to have evolved following a secondary endosymbiosis?
- green algae
- red algae
Protists that have a pellicle are surrounded by ______________.
- silica dioxide
- calcium carbonate
Protists with the capabilities to perform photosynthesis and to absorb nutrients from dead organisms are called ______________.
Which of these locomotor organs would likely be the shortest?
- a flagellum
- a cilium
- an extended pseudopod
- a pellicle
Alternation of generations describes which of the following?
- 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.
Which protist group exhibits mitochondrial remnants with reduced functionality?
- slime molds
Conjugation between two Paramecia produces ________ total daughter cells.
What is the function of the raphe in diatoms?
- capturing food
What genus of protists appears to contradict the statement that unicellularity restricts cell size?
An example of carbon fixation is _____________.
Which parasitic protist evades the host immune system by altering its surface proteins with each generation?
- Paramecium caudatum
- Trypanosoma brucei
- Plasmodium falciparum
- Phytophthora infestans