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95 Cards in this Set

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Protist reproduction
may be sexual
Both Trichomonas and Giardia are parasitic protists in the group called
excavates
Phytoplankton are very important to the aquatic ecosystems because they
A. produce oxygen.

B. produce glucose.

C. absorb carbon dioxide.

D. All of the above are true.

E. None of the above are true.

ANSWER IS D
Which of the following characteristics distinguishes red algae from diatoms and dinoflagellates?
multicellular
Which protozoan group consists of entirely parasitic forms?
apicomplexans
Which group is characterized by gritty, glassy, protective shells?
diatoms
A parasitic protist that presents a major health problem to backpackers and hikers if they drink unfiltered stream or lake water is
Giardia
Which of the following may be parasitic in humans?
an amoeba or an apicomplexan
Which group has silica shells similar to those of diatoms?
radiolarians
The eyespot of a Euglena cell allows it to
orient toward light.
Which group is the critical foundation of marine food webs?
diatoms
Which protist causes African sleeping sickness?
Trypanosoma
A symbiotic protist lives within the guts of termites and allows the host to digest cellulose. This organism belongs to which group?
parabasalids
Beavers are major carriers of Giardia, a ________ that can cause severe diarrhea to people who drink water that contains the organism's cysts.
diplomonad
The giant kelp found along the Pacific coast is an example of
brown algae
Which of the following is a parasitic protist that is spread by Anopheles mosquitoes?
Plasmodium
The most complex group of unicellular protists is the ________.
ciliates
Dysentery can be caused by parasitic, lobose ________ that occur in freshwater in warm climates.
amoebas
Which group is commonly referred to as the "seaweeds"?
brown algae
Which protist is an invasive seaweed that has severely impacted the Mediterranean Sea, and threatens many other marine environments?
Caulerpa
Which of the following evolved from protists?
A. animals

B. plants

C. fungi

D. all of the above

E. none of the above

ANSWER IS D
The finger-like projections that some prosists use for capturing prey are called
pseudopods
The white cliffs of Dover, England were formed over millions of years by the accumulation of calcium carbonate shells from ________.
foraminiferans
Plasmodial slime molds are described as acellular because they
have no membranes surrounding their nuclei.
Which group is responsible for 70% of the photosynthesis on Earth?
phytoplankton
Which group has caused such agricultural problems as downy mildew, potato blight, and an avocado disease?
oomycetes
Free-floating, photosynthetic, unicellular members of Protista include
phytoplankton
Which group of photosynthetic, mostly marine protists were named for the presence of two flagella that create a "whirlpool-like" motion?
dinoflagellates
Which of the following is considered to be most closely related to the plants?
green algae
Which of the following is NOT a characteristic of the organism that causes malaria?
prokaryotic
Which unicellular protists have silica shells consisting of top and bottom halves that fit together like pill boxes?
diatoms
Which of the following is eukaryotic, usually acts as a producer in its ecosystem, and spins with its flagella?
a dinoflagellate
Which of the following groups is eukaryotic?
protists
Which of the following can be photosynthetic?
a diatom
When a red tide occurs, huge numbers of these microscopic organisms are filtered out of coastal waters by oysters and clams. This sometimes causes the shellfish to become toxic to people that eat them. The organisms that create the red tide are classified as
dinoflagellates
The ________ algae represent an important source of carrageenan, which is used to thicken paints, cosmetics and ice cream.
red
When you eat sushi rolls wrapped in nori (a type of seaweed), you are eating a
photosynthetic protist.
Protists may be
A. photosynthetic.

B. predatory.

C. symbiotic.

D. parasitic.

E. any of the above

ANSWER IS E
The short, hairlike structures that propel Paramecium through the water are called
cilia
When dry conditions or starvation stimulate an acellular slime mold to change form, it becomes
a fruiting body
Which group of protists includes photosynthetic, unicellular, freshwater organisms that possess eyespots?
euglenids
Which of the following makes pseudopods?
an amoeba
Protist photosynthesis relies upon
chloroplasts
Cyanobacteria and phytoplankton are both
photosynthetic
Which group of protists includes photosynthetic, individual cells that lack a rigid cell wall and move via a flagellum?
euglenids
Which of the following best describes the protists, as a group?
any eukaryote that is not a plant, animal, or fungus
Phytoplankton are
photosynthetic
Individuals of which protist group can grow hundreds of feet long, and almost half a foot per day?
brown algae
The active, feeding form of a/an ________ is a thin, multinucleate plasmodium.
acellular slime mold
Which protist causes a sexually transmitted disease?
Trichomonas
You find a new organism. It gains nutrients by secreting enzymes outside of itself and absorbing the digested product. It is eukaryotic and has a cell wall containing chitin. It reproduced with spores. Your new organism should be classified as a/an
fungus
Fungal hyphae usually are
haploid
Both bacteria and fungi digest food by ________.
secreting enzymes and then absorb the smaller molecules
Fungal cell walls are different from plant cell walls because fungal walls contain ________.
chitin, while plant walls have cellulose
Fungi are similar to plants because both ________.
have cell walls surrounding their plasma membranes
How do fungi usually obtain nutrients?
by digesting it externally and then absorbing it
The body of a fungus is generally composed of ________.
hyphae
If there were no fungi,
nutrient recycling would stop
Fungi are important to humans as
A. pesticides.

B. pathogens.

C. medicines.

D. foods.

E. all of the above

ANSWER IS E
The conspicuous structures on the surface of a dead tree that indicate a fungus is growing inside are for
reproduction
The cellular threads which form the body of a fungus are called ________.
hyphae
You discover a new "thing" . It has only RNA as a nucleic acid and lacks both a membrane and cytoplasm. This "thing" is
a virus
While examining a hot spring, you find something you haven't seen before. It has a cell membrane, but the cell wall lacks any peptidoglycan. It contains both DNA and RNA. The DNA is circular. It would be classified as
an Archaea
Which is the correct sequence of viral replication?
penetration - genetic material replication - transcription - protein synthesis - assembly
Which of the following causes infectious sores on the mucus membranes of the mouth that occur during times of stress?
herpes virus
Rabies is caused by
viruses
Avocado sunblotch is caused by
viroids
AIDS is caused by
viruses
Creutzfeldt-Jacob disease is caused by
prions
Mad cow disease is caused by
prions
Prions are
improperly folded proteins
Viroids
are infectious pieces of RNA
Which of the following is a true statement?
Most protists are single-celled
Where are we likely to find photosynthetic protists?
oceans, lakes and ponds
What negative impact do protists have on humans?
Many human diseases are caused by protists
What subgroup of protists swims with one flagellum, are photosynthetic and are common pond dwellers.
Euglenids
Which of the following groups is eukaryotic?
protists
Which of the following best describes the protists as a group?
any eukaryote that is not a plant, animal, or fungus
A protist that lives inside a host organism and absorbs nutrients from that living host is:
parasitic
Protists:
obtain nutrition through a variety of different methods
Protists that absorb nutrients from dead organic matter are:
decomposers
Protist photosynthesis relies on:
chloroplasts
The first protist chloroplast was likely a(n):
photosynthetic bacterium
________ are photosynthetic protists.
Algae
Which of the following is a group lacking mitochondria?
Excavates
What is an important characteristic of Giardia, a diplomonad that cause serious intestinal problems?
Each cell has two nuclei
You are a biologist who has just discovered that termites cannot digest wood, yet you have seen the damage termites can do to wood in homes. It has been suggested to you that this may be an example of mutualism. What does this mean to you?
A symbiotic relationship occurrs where two individuals benefit from the relationship. The termite is providing food in the form of wood for something in the termite's gut, which is digesting the wood that can be absorbed by the termite
Some parabasalids cause human infections. Which causes a sexually transmitted infection?
Trichomonas vaginalis
Trichomoniasis is a sexually transmitted disease that causes unpleasant symptoms in females, including vaginal itching and discharge. What symptoms are displayed in males?
There are no symptoms in males
What two characteristics are useful for supporting the photosynthetic mode of energy generation found in euglenids?
an eyespot (or photoreceptor) and a flagellum
A parasitic kinetoplastid is responsible for African sleeping sickness in mammals. What is the intermediate insect host of this protist?
the Tsetse fly
Which of the following are photosynthetic stramenophiles that encase themselves in protective shells of silica?
diatoms
Suppose you are walking along a Caribbean beach at night and as you watch the water gently lapping upon the shore, you notice small brilliant blue-green flashes of light. What do you suppose is causing them?
dinoflagellates
Which of the following is an apicomplexans that causes malaria?
Plasmodium
What protist was responsible for the "late blight" that destroyed nearly the entire potato crop in Ireland about 1845?
water mold