Biology Exam #2

Front 1

Protist reproduction

Back 1

may be sexual

Front 2

Both Trichomonas and Giardia are parasitic protists in the group called

Back 2

excavates

Front 3

Phytoplankton are very important to the aquatic ecosystems because they

Back 3

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

Front 4

Which of the following characteristics distinguishes red algae from diatoms and dinoflagellates?

Back 4

multicellular

Front 5

Which protozoan group consists of entirely parasitic forms?

Back 5

apicomplexans

Front 6

Which group is characterized by gritty, glassy, protective shells?

Back 6

diatoms

Front 7

A parasitic protist that presents a major health problem to backpackers and hikers if they drink unfiltered stream or lake water is

Back 7

Giardia

Front 8

Which of the following may be parasitic in humans?

Back 8

an amoeba or an apicomplexan

Front 9

Which group has silica shells similar to those of diatoms?

Back 9

radiolarians

Front 10

The eyespot of a Euglena cell allows it to

Back 10

orient toward light.

Front 11

Which group is the critical foundation of marine food webs?

Back 11

diatoms

Front 12

Which protist causes African sleeping sickness?

Back 12

Trypanosoma

Front 13

A symbiotic protist lives within the guts of termites and allows the host to digest cellulose. This organism belongs to which group?

Back 13

parabasalids

Front 14

Beavers are major carriers of Giardia, a ________ that can cause severe diarrhea to people who drink water that contains the organism's cysts.

Back 14

diplomonad

Front 15

The giant kelp found along the Pacific coast is an example of

Back 15

brown algae

Front 16

Which of the following is a parasitic protist that is spread by Anopheles mosquitoes?

Back 16

Plasmodium

Front 17

The most complex group of unicellular protists is the ________.

Back 17

ciliates

Front 18

Dysentery can be caused by parasitic, lobose ________ that occur in freshwater in warm climates.

Back 18

amoebas

Front 19

Which group is commonly referred to as the "seaweeds"?

Back 19

brown algae

Front 20

Which protist is an invasive seaweed that has severely impacted the Mediterranean Sea, and threatens many other marine environments?

Back 20

Caulerpa

Front 21

Which of the following evolved from protists?

Back 21

A. animals

B. plants

C. fungi

D. all of the above

E. none of the above

ANSWER IS D

Front 22

The finger-like projections that some prosists use for capturing prey are called

Back 22

pseudopods

Front 23

The white cliffs of Dover, England were formed over millions of years by the accumulation of calcium carbonate shells from ________.

Back 23

foraminiferans

Front 24

Plasmodial slime molds are described as acellular because they

Back 24

have no membranes surrounding their nuclei.

Front 25

Which group is responsible for 70% of the photosynthesis on Earth?

Back 25

phytoplankton

Front 26

Which group has caused such agricultural problems as downy mildew, potato blight, and an avocado disease?

Back 26

oomycetes

Front 27

Free-floating, photosynthetic, unicellular members of Protista include

Back 27

phytoplankton

Front 28

Which group of photosynthetic, mostly marine protists were named for the presence of two flagella that create a "whirlpool-like" motion?

Back 28

dinoflagellates

Front 29

Which of the following is considered to be most closely related to the plants?

Back 29

green algae

Front 30

Which of the following is NOT a characteristic of the organism that causes malaria?

Back 30

prokaryotic

Front 31

Which unicellular protists have silica shells consisting of top and bottom halves that fit together like pill boxes?

Back 31

diatoms

Front 32

Which of the following is eukaryotic, usually acts as a producer in its ecosystem, and spins with its flagella?

Back 32

a dinoflagellate

Front 33

Which of the following groups is eukaryotic?

Back 33

protists

Front 34

Which of the following can be photosynthetic?

Back 34

a diatom

Front 35

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

Back 35

dinoflagellates

Front 36

The ________ algae represent an important source of carrageenan, which is used to thicken paints, cosmetics and ice cream.

Back 36

red

Front 37

When you eat sushi rolls wrapped in nori (a type of seaweed), you are eating a

Back 37

photosynthetic protist.

Front 38

Protists may be

Back 38

A. photosynthetic.

B. predatory.

C. symbiotic.

D. parasitic.

E. any of the above

ANSWER IS E

Front 39

The short, hairlike structures that propel Paramecium through the water are called

Back 39

cilia

Front 40

When dry conditions or starvation stimulate an acellular slime mold to change form, it becomes

Back 40

a fruiting body

Front 41

Which group of protists includes photosynthetic, unicellular, freshwater organisms that possess eyespots?

Back 41

euglenids

Front 42

Which of the following makes pseudopods?

Back 42

an amoeba

Front 43

Protist photosynthesis relies upon

Back 43

chloroplasts

Front 44

Cyanobacteria and phytoplankton are both

Back 44

photosynthetic

Front 45

Which group of protists includes photosynthetic, individual cells that lack a rigid cell wall and move via a flagellum?

Back 45

euglenids

Front 46

Which of the following best describes the protists, as a group?

Back 46

any eukaryote that is not a plant, animal, or fungus

Front 47

Phytoplankton are

Back 47

photosynthetic

Front 48

Individuals of which protist group can grow hundreds of feet long, and almost half a foot per day?

Back 48

brown algae

Front 49

The active, feeding form of a/an ________ is a thin, multinucleate plasmodium.

Back 49

acellular slime mold

Front 50

Which protist causes a sexually transmitted disease?

Back 50

Trichomonas

Front 51

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

Back 51

fungus

Front 52

Fungal hyphae usually are

Back 52

haploid

Front 53

Both bacteria and fungi digest food by ________.

Back 53

secreting enzymes and then absorb the smaller molecules

Front 54

Fungal cell walls are different from plant cell walls because fungal walls contain ________.

Back 54

chitin, while plant walls have cellulose

Front 55

Fungi are similar to plants because both ________.

Back 55

have cell walls surrounding their plasma membranes

Front 56

How do fungi usually obtain nutrients?

Back 56

by digesting it externally and then absorbing it

Front 57

The body of a fungus is generally composed of ________.

Back 57

hyphae

Front 58

If there were no fungi,

Back 58

nutrient recycling would stop

Front 59

Fungi are important to humans as

Back 59

A. pesticides.

B. pathogens.

C. medicines.

D. foods.

E. all of the above

ANSWER IS E

Front 60

The conspicuous structures on the surface of a dead tree that indicate a fungus is growing inside are for

Back 60

reproduction

Front 61

The cellular threads which form the body of a fungus are called ________.

Back 61

hyphae

Front 62

You discover a new "thing" . It has only RNA as a nucleic acid and lacks both a membrane and cytoplasm. This "thing" is

Back 62

a virus

Front 63

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

Back 63

an Archaea

Front 64

Which is the correct sequence of viral replication?

Back 64

penetration - genetic material replication - transcription - protein synthesis - assembly

Front 65

Which of the following causes infectious sores on the mucus membranes of the mouth that occur during times of stress?

Back 65

herpes virus

Front 66

Rabies is caused by

Back 66

viruses

Front 67

Avocado sunblotch is caused by

Back 67

viroids

Front 68

AIDS is caused by

Back 68

viruses

Front 69

Creutzfeldt-Jacob disease is caused by

Back 69

prions

Front 70

Mad cow disease is caused by

Back 70

prions

Front 71

Prions are

Back 71

improperly folded proteins

Front 72

Viroids

Back 72

are infectious pieces of RNA

Front 73

Which of the following is a true statement?

Back 73

Most protists are single-celled

Front 74

Where are we likely to find photosynthetic protists?

Back 74

oceans, lakes and ponds

Front 75

What negative impact do protists have on humans?

Back 75

Many human diseases are caused by protists

Front 76

What subgroup of protists swims with one flagellum, are photosynthetic and are common pond dwellers.

Back 76

Euglenids

Front 77

Which of the following groups is eukaryotic?

Back 77

protists

Front 78

Which of the following best describes the protists as a group?

Back 78

any eukaryote that is not a plant, animal, or fungus

Front 79

A protist that lives inside a host organism and absorbs nutrients from that living host is:

Back 79

parasitic

Front 80

Protists:

Back 80

obtain nutrition through a variety of different methods

Front 81

Protists that absorb nutrients from dead organic matter are:

Back 81

decomposers

Front 82

Protist photosynthesis relies on:

Back 82

chloroplasts

Front 83

The first protist chloroplast was likely a(n):

Back 83

photosynthetic bacterium

Front 84

________ are photosynthetic protists.

Back 84

Algae

Front 85

Which of the following is a group lacking mitochondria?

Back 85

Excavates

Front 86

What is an important characteristic of Giardia, a diplomonad that cause serious intestinal problems?

Back 86

Each cell has two nuclei

Front 87

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?

Back 87

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

Front 88

Some parabasalids cause human infections. Which causes a sexually transmitted infection?

Back 88

Trichomonas vaginalis

Front 89

Trichomoniasis is a sexually transmitted disease that causes unpleasant symptoms in females, including vaginal itching and discharge. What symptoms are displayed in males?

Back 89

There are no symptoms in males

Front 90

What two characteristics are useful for supporting the photosynthetic mode of energy generation found in euglenids?

Back 90

an eyespot (or photoreceptor) and a flagellum

Front 91

A parasitic kinetoplastid is responsible for African sleeping sickness in mammals. What is the intermediate insect host of this protist?

Back 91

the Tsetse fly

Front 92

Which of the following are photosynthetic stramenophiles that encase themselves in protective shells of silica?

Back 92

diatoms

Front 93

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?

Back 93

dinoflagellates

Front 94

Which of the following is an apicomplexans that causes malaria?

Back 94

Plasmodium

Front 95

What protist was responsible for the "late blight" that destroyed nearly the entire potato crop in Ireland about 1845?

Back 95

water mold