Question 1

_______ are specialized vesicles that excrete the excess water taken in by some microbial eukaryotes.

Accepted Answer

Contractil

Question 2

Which statement about oomycetes is false?

Accepted Answer

A)  They are absorptive heterotrophs, secreting enzymes and then absorbing the digested nutrients. 
B)  They are closely related to fungi. 
C)  They have flagellated reproductive cells. 
D)  They have cellulose in their cell walls. 
E)  Many are saprobic. 
A)  They are absorptive heterotrophs, secreting enzymes and then absorbing the digested nutrients. 
B)  They are closely related to fungi. 
C)  They have flagellated reproductive cells. 
D)  They have cellulose in their cell walls. 
E)  Many are saprobic.

Question 3

Which group can produce a toxin in marine environments that accumulates in clams, mussels, and oysters and can cause paralytic shellfish poisoning?

Accepted Answer

A)  Red algae 
B)  Radiolarians 
C)  Diatoms 
D)  Euglenids 
E)  Dinoflagellates 
A)  Red algae 
B)  Radiolarians 
C)  Diatoms 
D)  Euglenids 
E)  Dinoflagellates

Question 4

Which statement concerning the spore-bearing fruiting structures produced by plasmodial slime molds is true?

Accepted Answer

A)  Individual myxamoebas disperse 
B)  They contain diploid nuclei. 
C)  Their development is prompted by favorable conditions of moisture and food supply. 
D)  Knobs called sporangia develop at the end of the stalk of the fruiting structure. 
E)  The spores become diploid swarm cells that move by means of cilia. 
A)  Individual myxamoebas disperse 
B)  They contain diploid nuclei. 
C)  Their development is prompted by favorable conditions of moisture and food supply. 
D)  Knobs called sporangia develop at the end of the stalk of the fruiting structure. 
E)  The spores become diploid swarm cells that move by means of cilia.

Question 5

_______ have cell walls typically composed of cellulose are absorptive heterotrophs, and play a vital role in the decomposition of dead organic matter.

Accepted Answer

The answer of _______ have cell walls typically composed of...

Question 6

Under adverse environmental conditions, the swarm cells of plasmodial slime molds form a walled and resistant structure called a _______.On restoration of favorable conditions, swarm cells are released to potentially fuse and form a _______.

Accepted Answer

A)  sporangium; cyst 
B)  cyst; zygote 
C)  sporangium; plasmodium 
D)  pseudoplasmodium; plasmodium 
E)  sporangium; zygote 
A)  sporangium; cyst 
B)  cyst; zygote 
C)  sporangium; plasmodium 
D)  pseudoplasmodium; plasmodium 
E)  sporangium; zygote

Question 7

Which of the following groups of protists secretes an external "shell" of silica (silicon dioxide)?

Accepted Answer

A)  Paramecia 
B)  Diatoms 
C)  Red algae 
D)  Euglenids 
E)  Amoebozoans 
A)  Paramecia 
B)  Diatoms 
C)  Red algae 
D)  Euglenids 
E)  Amoebozoans

Question 8

If an autotrophic Euglena species in pond water were placed in the dark, it would most likely

Accepted Answer

A)  stop using its chloroplasts to synthesize organic compounds. 
B)  produce an excess of photosynthetic pigment. 
C)  begin using its chloroplast to synthesize organic compounds. 
D)  digest its chloroplast to obtain energy. 
E)  die. 
A)  stop using its chloroplasts to synthesize organic compounds. 
B)  produce an excess of photosynthetic pigment. 
C)  begin using its chloroplast to synthesize organic compounds. 
D)  digest its chloroplast to obtain energy. 
E)  die.

Question 9

A prokaryotic cell with a rigid cell wall is limited in how large it can grow.A eukaryotic cell, with a flexible cell membrane, is able to grow much larger.The primary reason for this is that

Accepted Answer

A)  the flexible cell membrane in a eukaryotic cell allows for infolding, increasing surface area. 
B)  there are no surface area-to-volume constraints on a eukaryotic cell. 
C)  eukaryotic cells have mitochondria, which require the cell to be larger. 
D)  eukaryotic cells have a cytoskeleton, which allows for a smaller surface area-to-volume ratio. 
E)  eukaryotic cells must to be large to accommodate food vacuoles. 
A)  the flexible cell membrane in a eukaryotic cell allows for infolding, increasing surface area. 
B)  there are no surface area-to-volume constraints on a eukaryotic cell. 
C)  eukaryotic cells have mitochondria, which require the cell to be larger. 
D)  eukaryotic cells have a cytoskeleton, which allows for a smaller surface area-to-volume ratio. 
E)  eukaryotic cells must to be large to accommodate food vacuoles.

Question 10

Without _______, radiolarians would have a reduced surface area and most likely sink in their marine environment.

Accepted Answer

The answer of Without _______, radiolarians would have a reduced...

Question 11

Sporulation is

Accepted Answer

A)  the formation of specialized cells that can develop into new individuals. 
B)  the equal splitting of one cell into two by mitosis followed by cytokinesis. 
C)  the outgrowth of a new cell from the surface of an old one. 
D)  the splitting of one cell into more than two cells. 
E)  necessary for the creation of gametes. 
A)  the formation of specialized cells that can develop into new individuals. 
B)  the equal splitting of one cell into two by mitosis followed by cytokinesis. 
C)  the outgrowth of a new cell from the surface of an old one. 
D)  the splitting of one cell into more than two cells. 
E)  necessary for the creation of gametes.

Question 12

Loboseans are small amoebozoans that feed on other small organisms and particles of organic matter by phagocytosis, engulfing them with pseudopods.Their creeping locomotion and their manner of engulfing food particles fit them for life

Accepted Answer

A)  floating among plankton in the open ocean. 
B)  as parasites inside mammalian guts absorbing products of digestion. 
C)  on the bottoms of lakes and ponds near sedentary organisms and organic particles. 
D)  in the surf zone of oceans, attached to rocks by holdfasts, where nutrients are brought in by wave action. 
E)  within a cell wall in terrestrial sediments rich in organic matter. 
A)  floating among plankton in the open ocean. 
B)  as parasites inside mammalian guts absorbing products of digestion. 
C)  on the bottoms of lakes and ponds near sedentary organisms and organic particles. 
D)  in the surf zone of oceans, attached to rocks by holdfasts, where nutrients are brought in by wave action. 
E)  within a cell wall in terrestrial sediments rich in organic matter.

Exam 26: The Origin and Diversification of Eukaryotes

_______ are specialized vesicles that excrete the excess water taken in by some microbial eukaryotes.

Which statement about oomycetes is false?

Which group can produce a toxin in marine environments that accumulates in clams, mussels, and oysters and can cause paralytic shellfish poisoning?

Which statement concerning the spore-bearing fruiting structures produced by plasmodial slime molds is true?

_______ have cell walls typically composed of cellulose are absorptive heterotrophs, and play a vital role in the decomposition of dead organic matter.

Under adverse environmental conditions, the swarm cells of plasmodial slime molds form a walled and resistant structure called a _______.On restoration of favorable conditions, swarm cells are released to potentially fuse and form a _______.

Which of the following groups of protists secretes an external "shell" of silica (silicon dioxide)?

If an autotrophic Euglena species in pond water were placed in the dark, it would most likely

A prokaryotic cell with a rigid cell wall is limited in how large it can grow.A eukaryotic cell, with a flexible cell membrane, is able to grow much larger.The primary reason for this is that

Without _______, radiolarians would have a reduced surface area and most likely sink in their marine environment.

Sporulation is

Loboseans are small amoebozoans that feed on other small organisms and particles of organic matter by phagocytosis, engulfing them with pseudopods.Their creeping locomotion and their manner of engulfing food particles fit them for life

Studying Life

Small Molecules and the Chemistry of Life

Proteins, Carbohydrates, and Lipids

Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

Cell Membranes

Cell Communication and Multicellularity

Energy, Enzymes, and Metabolism

Pathways That Harvest Chemical Energy

Photosynthesis: Energy From Sunlight

The Cell Cycle and Cell Division

Inheritance, Genes, and Chromosomes

Dna and Its Role in Heredity

From Dna to Protein: Gene Expression

Gene Mutation and Molecular Medicine

Regulation of Gene Expression

Genomes

Recombinant Dna and Biotechnology

Mechanisms of Evolution

Reconstructing and Using Phylogenies

Speciation

Evolution of Genes and Genomes

The History of Life on Earth

Bacteria, Archaea, and Viruses

Plants Without Seeds: From Water to Land

The Evolution of Seed Plants

The Evolution and Diversity of Fungi

Animal Origins and the Evolution of Body Plans

Protostome Animals

Deuterostome Animals

The Plant Body

Transport in Plants

Plant Nutrition

Regulation of Plant Growth

Reproduction in Flowering Plants

Plant Responses to Environmental Challenges

Physiology, Homeostasis, and Temperature Regulation

Animal Hormones

Immunology: Animal Defense Systems

Animal Reproduction

Animal Development

Neurons, Glia, and Nervous Systems

Sensory Systems

The Mammalian Nervous System: Structure and Higher Functions

Musculoskeletal Systems

Gas Exchange

Circulatory Systems

Nutrition, Digestion, and Absorption

Salt and Water Balance and Nitrogen Excretion

Animal Behavior

The Physical Environment and Biogeography of Life

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A Changing Biosphere

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Under adverse environmental conditions, the swarm cells of plasmodial slime molds form a walled and resistant structure called a _.On restoration of favorable conditions, swarm cells are released to potentially fuse and form a _.