Question 1

Silica walls are characteristic of

Accepted Answer

A)   red algae.
B)   diatoms.
C)   slime molds.
D)   euglenoids.
E)   brown algae.F) A) and C)
G) C) and D)

Question 2

Water molds are unlike fungi in that water molds have diploid filaments and cell walls containing cellulose,whereas fungi have haploid filaments and cell walls containing chitin.

Accepted Answer

A) True 
 B)False

Question 3

Dictyostelium discoideum is an unusual organism,one that straddles the boundary between the unicellular and the multicellular.Its feeding phase consists of individual amoeba-like cells that move independently,feeding on bacteria by phagocytosis.When the food runs out,cells begin to aggregate into a multicelled structure that migrates toward light.The cells differentiate into a base,stalk,and spores; only the spores survive to colonize a new habitat.Dictyostelium discoideum is which of the following?

Accepted Answer

A)   a heterotroph and detritovore
B)   a heterotroph and autotroph
C)   a detritovore
D)   an autotroph
E)   a heterotrophF) All of the above
G) C) and E)

Question 4

The white cliffs of Dover are composed mostly of foraminiferans shells.These organisms move by pseudopodia and feed by phagocytosis.Foraminiferans are an example of which of the following?

Accepted Answer

A)   a diatom
B)   an apicomplexan
C)   an alga
D)   a slime mold
E)   a protozoanF) A) and E)
G) A) and B)

Question 5

Mitochondria in algae are thought to have arisen from which source?

Accepted Answer

A)   Algae don't have mitochondria.
B)   aerobic bacteria
C)   cyanobacteria
D)   anaerobic bacteria
E)   photosynthetic virusesF) A) and E)
G) B) and C)

Question 6

The correct sequence in body forms and life stages occurring in alternation of generations in green algae protists is

Accepted Answer

A)   sporophyte - meiosis division - spores - mitotic division - gametophytes - gametes - fertilization - zygote.
B)   initial protist cell - engulfed aerobic bacterium - mitochondrion - engulfed cyanbacterium - chloroplast - mature protist.
C)   gametocytes - gametes - fertilization - zygote - sporozoite - transformation - merozoite.
D)   stalk - fruiting body - spores - free cells - slug.
E)   None of the answer choices are correct.F) All of the above
G) A) and B)

Question 7

In the experiment studying bioluminescence and the predation of copepods by fish,a control group of jars with bioluminescent dinoflagellates experienced a higher predation rate of copepods by stickleback fish than in the jars with nonbioluminescent dinoflagellates.This provided significant evidence that

Accepted Answer

A)   All of the answer choices are correct.
B)   copepods that would eat dinoflagellates benefit from fleeing when the protists bioluminesce.
C)   dinoflagellates can avoid being eaten by increasing the flashing, and attracting predators to eat the copepods near them.
D)   natural selection has favored the survival of dinoflagellates that can emit light in flashes when disturbed.
E)   natural selection has favored the survival of copepods that move rapidly away from flashing bioluminescent dinoflagellates.F) B) and E)
G) A) and B)

Question 8

Protists

Accepted Answer

A)   do not have a nucleus.
B)   all have a cell wall.
C)   are eukaryotes.
D)   do not have membrane-bounded organelles.
E)   are prokaryotes.F) A) and E)
G) A) and B)

Question 9

A dinoflagellate has both a transverse flagellum and longitudinal flagellum.

Accepted Answer

A) True 
 B)False

Question 10

Malaria is caused by Plasmodium falciparum,a nonmotile protist that contains a cluster of microtubules at one end of the cell.Once injected into the bloodstream,these microtubules are used to attach to red blood cells.In areas of the world where malaria is endemic,people have a relatively high incidence of the allele for

Accepted Answer

A)   sickle cell.
B)   cystic fibrosis.
C)   blue eyes.
D)   mental retardation.
E)   hemophilia.F) A) and D)
G) A) and C)

Question 11

In malaria,Plasmodium falciparum grow inside of which human cells?

Accepted Answer

A)   liver and red blood cells
B)   liver and intestinal cells
C)   intestinal cells
D)   red blood cells
E)   liver cellsF) A) and C)
G) None of the above

Question 12

DNA sequence evidence suggests that plants,fungi,and animals arose from different lineages of unicellular protists.This suggests which of the following?

Accepted Answer

A)   Multicellular organisms only arose once in evolutionary history.
B)   Protists arose before the other three kingdoms.
C)   All unicellular organisms are now extinct.
D)   Early ancestors to plants, fungi, and animals could interbreed.
E)   The animal, plant, and fungal kingdoms contain some single-celled organisms.F) B) and E)
G) A) and B)

Question 13

The white cliffs of Dover are composed mostly of foraminiferans shells.These organisms move by pseudopodia and feed by phagocytosis.Foraminiferan shells are made of which of the following?

Accepted Answer

A)   chitin
B)   cellulose
C)   peptidoglycan
D)   silica
E)   calcium carbonateF) A) and E)
G) B) and C)

Question 14

Protists can be heterotrophs.

Accepted Answer

A) True 
 B)False

Question 15

A woman was told by her doctor that while she is pregnant,she might want to let someone else care for her cats so she would not contract toxoplasmosis through which mechanism?

Accepted Answer

A)   exposure to infected cat feces
B)   fleas that transmit toxoplasmosis
C)   scratches from infected claws
D)   infection from mice the cat may bring into the house
E)   infection from salivaF) A) and D)
G) All of the above

Question 16

A substance produced by brown algae that is used as an emulsifying and thickening agent in many foods and other products is

Accepted Answer

A)   algin.
B)   agar.
C)   carageenan.
D)   red ooze.
E)   gelatin.F) A) and E)
G) A) and D)

Question 17

Diatoms are a type of algae,but with a hard silica shell.Which of the following structures would you expect to find directly underneath the silica shell?

Accepted Answer

A)   a cell wall
B)   a plasma membrane
C)   a chloroplast
D)   a nucleus
E)   a mitochondrionF) All of the above
G) C) and E)

Question 18

Malaria is caused by Plasmodium falciparum,a nonmotile protist that contains a cluster of microtubules at one end of the cell.Once injected into the bloodstream,these microtubules are used to attach to red blood cells.Malaria is transmitted by

Accepted Answer

A)   the bite of a sand fly.
B)   the bite of a tsetse fly.
C)   the bite of a mosquito.
D)   the bite of a kissing bug.
E)   ingesting food.F) A) and B)
G) B) and C)

Question 19

Cryptosporidium is an apicomplexan that can contaminate water supplies.In recreational waters,a rapid outbreak may occur.Which of the following would you predict to be the cause of a Cryptosporidium outbreak?

Accepted Answer

A)   It will be difficult to treat with chlorine because it forms cysts.
B)   It will enter a person's body through their respiratory tract.
C)   It can grow in any water supply because it is photosynthetic.
D)   It can only be transmitted by insect bites because it is nonmotile.
E)   It spreads rapidly because it has flagella.F) A) and B)
G) B) and E)

Question 20

One reason that malaria continues to be the world's most significant infectious disease is because Plasmodium falciparum continues to develop resistance to the drugs that have been used to treat malaria.This is due to which of the following?

Accepted Answer

A)   The antimalarial drugs cause mutations to occur in the mosquito.
B)   Some mosquitoes have preexisting mutations that make them resistant to antimalarial drugs.
C)   Some people have preexisting mutations that make them resistant to antimalarial drugs.
D)   Some Plasmodium falciparum have preexisting mutations that make them resistant to antimalarial drugs.
E)   The antimalarial drugs cause mutations to occur in Plasmodium falciparum.F) A) and C)
G) B) and D)

Exam 18: Protists

Protists

Correct Answer
verified

Protists can be heterotrophs.

Correct Answer
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One reason that malaria continues to be the world's most significant infectious disease is because Plasmodium falciparum continues to develop resistance to the drugs that have been used to treat malaria.This is due to which of the following?

Correct Answer
verified

Correct Answer
verified

Mitochondria in algae are thought to have arisen from which source?

Correct Answer
verified

The correct sequence in body forms and life stages occurring in alternation of generations in green algae protists is

Correct Answer
verified

DNA sequence evidence suggests that plants,fungi,and animals arose from different lineages of unicellular protists.This suggests which of the following?

Correct Answer
verified

A woman was told by her doctor that while she is pregnant,she might want to let someone else care for her cats so she would not contract toxoplasmosis through which mechanism?

Correct Answer
verified

Silica walls are characteristic of

Correct Answer
verified

Diatoms are a type of algae,but with a hard silica shell.Which of the following structures would you expect to find directly underneath the silica shell?

Correct Answer
verified

The white cliffs of Dover are composed mostly of foraminiferans shells.These organisms move by pseudopodia and feed by phagocytosis.Foraminiferans are an example of which of the following?

Correct Answer
verified

The white cliffs of Dover are composed mostly of foraminiferans shells.These organisms move by pseudopodia and feed by phagocytosis.Foraminiferan shells are made of which of the following?

Correct Answer
verified

Correct Answer
verified

A substance produced by brown algae that is used as an emulsifying and thickening agent in many foods and other products is

Correct Answer
verified

Cryptosporidium is an apicomplexan that can contaminate water supplies.In recreational waters,a rapid outbreak may occur.Which of the following would you predict to be the cause of a Cryptosporidium outbreak?

Correct Answer
verified

Malaria is caused by Plasmodium falciparum,a nonmotile protist that contains a cluster of microtubules at one end of the cell.Once injected into the bloodstream,these microtubules are used to attach to red blood cells.Malaria is transmitted by

Correct Answer
verified

In malaria,Plasmodium falciparum grow inside of which human cells?

Correct Answer
verified

Water molds are unlike fungi in that water molds have diploid filaments and cell walls containing cellulose,whereas fungi have haploid filaments and cell walls containing chitin.

Correct Answer
verified

A dinoflagellate has both a transverse flagellum and longitudinal flagellum.

Correct Answer
verified

Correct Answer
verified

Exam 18: Protists

Protists

Correct AnswerverifiedShow Answer

Protists can be heterotrophs.

Correct AnswerverifiedShow Answer

One reason that malaria continues to be the world's most significant infectious disease is because Plasmodium falciparum continues to develop resistance to the drugs that have been used to treat malaria.This is due to which of the following?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Mitochondria in algae are thought to have arisen from which source?

Correct AnswerverifiedShow Answer

The correct sequence in body forms and life stages occurring in alternation of generations in green algae protists is

Correct AnswerverifiedShow Answer

DNA sequence evidence suggests that plants,fungi,and animals arose from different lineages of unicellular protists.This suggests which of the following?

Correct AnswerverifiedShow Answer

A woman was told by her doctor that while she is pregnant,she might want to let someone else care for her cats so she would not contract toxoplasmosis through which mechanism?

Correct AnswerverifiedShow Answer

Silica walls are characteristic of

Correct AnswerverifiedShow Answer

Diatoms are a type of algae,but with a hard silica shell.Which of the following structures would you expect to find directly underneath the silica shell?

Correct AnswerverifiedShow Answer

The white cliffs of Dover are composed mostly of foraminiferans shells.These organisms move by pseudopodia and feed by phagocytosis.Foraminiferans are an example of which of the following?

Correct AnswerverifiedShow Answer

The white cliffs of Dover are composed mostly of foraminiferans shells.These organisms move by pseudopodia and feed by phagocytosis.Foraminiferan shells are made of which of the following?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A substance produced by brown algae that is used as an emulsifying and thickening agent in many foods and other products is

Correct AnswerverifiedShow Answer

Cryptosporidium is an apicomplexan that can contaminate water supplies.In recreational waters,a rapid outbreak may occur.Which of the following would you predict to be the cause of a Cryptosporidium outbreak?

Correct AnswerverifiedShow Answer

Malaria is caused by Plasmodium falciparum,a nonmotile protist that contains a cluster of microtubules at one end of the cell.Once injected into the bloodstream,these microtubules are used to attach to red blood cells.Malaria is transmitted by

Correct AnswerverifiedShow Answer

In malaria,Plasmodium falciparum grow inside of which human cells?

Correct AnswerverifiedShow Answer

Water molds are unlike fungi in that water molds have diploid filaments and cell walls containing cellulose,whereas fungi have haploid filaments and cell walls containing chitin.

Correct AnswerverifiedShow Answer

A dinoflagellate has both a transverse flagellum and longitudinal flagellum.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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