Question 1

What might be the advantage to an ancestral cell if it maintained a photosynthetic bacterium within its cytoplasm rather than digest it?

Accepted Answer

A)  It could now utilize hydrogen sulfide as an energy source.
B)  It could now use photosynthesis to make its food.
C)  It could now live in a highly oxygenated environment.
D)  It could now use glucose as an energy source.E) C) and D)
F) B) and C)

Question 2

Which protist group includes members with plantlike traits such as chloroplasts and multicellularity?

Accepted Answer

A)  Slime molds
B)  Algae
C)  Amoebas
D)  None of the protists are multicellular.E) None of the above
F) B) and C)

Question 3

Bacteria reproduce asexually via binary fission.This process generates ________.

Accepted Answer

A)  Genetically different bacteria
B)  Genetically identical bacteriaC) A) and B)
D) undefined

Question 4

Where do you expect to find thermophiles?

Accepted Answer

A)  In environments lacking oxygen
B)  In salty environments
C)  In dry environments
D)  In hot environmentsE) A) and D)
F) A) and C)

Question 5

Which was first on the planet, prokaryotes or eukaryotes?

Accepted Answer

A)  Eukaryotes
B)  Prokaryotes
C)  They both appear in the fossil record at about the same time.
D)  Researchers do not know which group came firstE) B) and C)
F) A) and C)

Question 6

Describe all the possible forms of nucleic acids found in viruses.

Accepted Answer

Single-stranded DNA,...

Question 7

What do scientists believe was the original genetic material able to copy itself without assistance?

Accepted Answer

A)  DNA
B)  RNA
C)  Proteins
D)  CarbohydratesE) A) and B)
F) A) and C)

Question 8

All protists are unicellular organisms.

Accepted Answer

A) True 
 B)False

Question 9

The practice of using bacteria to remove pollutants from the environment is called ________.

Accepted Answer

A)  Nitrogen fixation
B)  Bioremediaton
C)  Bioelimination
D)  TransductionE) None of the above
F) B) and D)

Question 10

What do the following groups of organisms have in common? methanogens, halophiles, thermophiles

Accepted Answer

A)  They are all bacteria species
B)  They are all found in our everyday surroundings
C)  They are all archaea species
D)  They all thrive in extreme heat environmentsE) B) and D)
F) All of the above

Question 11

Which organisms are called extremophiles and flourish mostly in extreme conditions?

Accepted Answer

A)  Protozoans
B)  Archaea
C)  Bacteria
D)  FungiE) None of the above
F) A) and D)

Question 12

The misshapen version of a protein that causes properly folded proteins to misfold is called a ________.

Accepted Answer

A)  virus
B)  prion
C)  viroid
D)  capsidE) A) and B)
F) A) and C)

Question 13

Bacteria that have a spherical shape are called ________.

Accepted Answer

A)  coccus
B)  bacillus
C)  spirillum
D)  spheroidE) A) and D)
F) None of the above

Question 14

Where would you find the double-stranded HIV DNA in an infected cell?

Accepted Answer

A)  Incorporated directly into the host cell's DNA
B)  As a separate plasmid in the host cell's nucleus
C)  In a vesicle in the cytoplasm
D)  There is no HIV form of DNA.It exists only as RNA..E) None of the above
F) A) and C)

Question 15

Approximately when did the earth's crust solidify?

Accepted Answer

A)  8 billion years ago
B)  4 billion years ago
C)  1 billion years ago
D)  4 million years agoE) A) and B)
F) A) and C)

Question 16

What are the steps toward multicellularity, in the correct order?

Accepted Answer

A)  Some cells become gametes, then a colony forms, and finally some cells start to specialize.
B)  First a colony of protists forms, then some become gametes, and finally others specialize in various tasks.
C)  Some protists start to specialize for specific tasks, then they form a colony with specialists, and finally some specialists become gametes.
D)  First a colony of protists forms, then some protists start to specialize in specific tasks, and finally some cells become gametes.E) C) and D)
F) A) and D)

Question 17

How does azidothymidine (AZT)  fight AIDS?

Accepted Answer

A)  It blocks the virus from entering the cell.
B)  It targets the virus for destruction.
C)  It blocks the enzyme that converts viral RNA to DNA (called reverse transcriptase, or RT) .
D)  It blocks the enzyme that assembles all of the RNA proteins into new HIV viruses.E) A) and B)
F) B) and C)

Question 18

If you look at unknown cells under a microscope, what could lead you to correctly conclude that they are prokaryotic cells?

Accepted Answer

A)  They appear to have a cell wall.
B)  They lack a nucleus.
C)  They are oblong in shape.
D)  They form a colony.E) B) and C)
F) None of the above

Question 19

What does the term biogenesis mean?

Accepted Answer

A)  Formation of life from preexisting cells
B)  Formation of life from nonliving chemicals
C)  Formation of chemicals from organic monomers
D)  Formation of self-replicating moleculesE) A) and C)
F) A) and B)

Question 20

What is the endomembrane system?

Accepted Answer

A)  Another name for the endoplasmic reticulum
B)  Another name for the Golgi apparatus
C)  A group of internal membranes and organelles that are highly connected within a eukaryotic cell
D)  A group of vesicles that are highly connected within a eukaryotic cellsE) None of the above
F) C) and D)

Exam 8: Biodiversity 1: Microscopic Organisms

What are the steps toward multicellularity, in the correct order?

Correct AnswerverifiedShow Answer

Which organisms are called extremophiles and flourish mostly in extreme conditions?

Correct AnswerverifiedShow Answer

All protists are unicellular organisms.

Correct AnswerverifiedShow Answer

Which protist group includes members with plantlike traits such as chloroplasts and multicellularity?

Correct AnswerverifiedShow Answer

Approximately when did the earth's crust solidify?

Correct AnswerverifiedShow Answer

What might be the advantage to an ancestral cell if it maintained a photosynthetic bacterium within its cytoplasm rather than digest it?

Correct AnswerverifiedShow Answer

Bacteria that have a spherical shape are called ________.

Correct AnswerverifiedShow Answer

How does azidothymidine (AZT) fight AIDS?

Correct AnswerverifiedShow Answer

What does the term biogenesis mean?

Correct AnswerverifiedShow Answer

If you look at unknown cells under a microscope, what could lead you to correctly conclude that they are prokaryotic cells?

Correct AnswerverifiedShow Answer

What do the following groups of organisms have in common? methanogens, halophiles, thermophiles

Correct AnswerverifiedShow Answer

What do scientists believe was the original genetic material able to copy itself without assistance?

Correct AnswerverifiedShow Answer

Describe all the possible forms of nucleic acids found in viruses.

Correct AnswerverifiedSingle-stranded DNA,...View AnswerShow Answer

Bacteria reproduce asexually via binary fission.This process generates ________.

Correct AnswerverifiedShow Answer

Which was first on the planet, prokaryotes or eukaryotes?

Correct AnswerverifiedShow Answer

The misshapen version of a protein that causes properly folded proteins to misfold is called a ________.

Correct AnswerverifiedShow Answer

The practice of using bacteria to remove pollutants from the environment is called ________.

Correct AnswerverifiedShow Answer

What is the endomembrane system?

Correct AnswerverifiedShow Answer

Where do you expect to find thermophiles?

Correct AnswerverifiedShow Answer

Where would you find the double-stranded HIV DNA in an infected cell?

Correct AnswerverifiedShow Answer

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Single-stranded DNA,...
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