Question 1

Evaluate the following statements.Which one is most accurate?

Accepted Answer

A) While bacteria reproduce asexually, they use many mechanisms to transfer genetic materials between each other and as such as not all genetically identical to each other. 
B) Since bacteria reproduce asexually, all bacteria originating from one source are genetically identical to each other. 
C) Bacteria reproduce asexually, and as such do not have mechanisms to generate genetic diversity among themselves. 
D) Bacteria reproduce sexually, and have many mechanisms to spread their genetic materials to other bacteria. 
A) While bacteria reproduce asexually, they use many mechanisms to transfer genetic materials between each other and as such as not all genetically identical to each other. 
B) Since bacteria reproduce asexually, all bacteria originating from one source are genetically identical to each other. 
C) Bacteria reproduce asexually, and as such do not have mechanisms to generate genetic diversity among themselves. 
D) Bacteria reproduce sexually, and have many mechanisms to spread their genetic materials to other bacteria. A

Question 2

When did the first eukaryotic cells form?

Accepted Answer

A) 2.1 thousand years ago 
B) 2.1 million years ago 
C) 2.1 billion years ago 
D) 3.7 billion years ago 
A) 2.1 thousand years ago 
B) 2.1 million years ago 
C) 2.1 billion years ago 
D) 3.7 billion years ago C

Question 3

Which protective structure forms to protect certain bacteria during periods of harsh conditions?

Accepted Answer

A) Flagella 
B) Biofilm 
C) Endospore 
D) Capsule 
A) Flagella 
B) Biofilm 
C) Endospore 
D) Capsule C

Question 4

Which of the following organisms are classified within the protists under algae?

Accepted Answer

A) Diatoms 
B) Dinoflagellates 
C) Seaweeds 
D) All of the above are types of algae 
A) Diatoms 
B) Dinoflagellates 
C) Seaweeds 
D) All of the above are types of algae

Question 5

How do viruses make copies of themselves?

Accepted Answer

A) By taking the nutrients of the host cell they infected 
B) By using the cellular machinery of the host cell they infected 
C) By digesting the host cell they infected 
D) By targeting their host cell for cell death 
A) By taking the nutrients of the host cell they infected 
B) By using the cellular machinery of the host cell they infected 
C) By digesting the host cell they infected 
D) By targeting their host cell for cell death

Question 6

Pathogen is ________.

Accepted Answer

A) a name given to all bacteria 
B) a name given only to bacteria that cause serious illnesses in humans 
C) a name given to all archaea 
D) a name given only to helpful bacteria 
A) a name given to all bacteria 
B) a name given only to bacteria that cause serious illnesses in humans 
C) a name given to all archaea 
D) a name given only to helpful bacteria

Question 7

How old is our planet Earth?

Accepted Answer

A) 4.6 thousand years old 
B) 4.6 million years old 
C) 3.5 billion years old 
D) 4.6 billion years old 
A) 4.6 thousand years old 
B) 4.6 million years old 
C) 3.5 billion years old 
D) 4.6 billion years old

Question 8

Why could prokaryotes survive without eukaryotes but eukaryotes could not survive without prokaryotes?

Accepted Answer

Prokaryotes existed for over a

Question 9

Food poisoning is often caused by a bacterium called ________.

Accepted Answer

A) Salmonella 
B) Staph 
C) MRSA 
D) Anthrax 
A) Salmonella 
B) Staph 
C) MRSA 
D) Anthrax

Question 10

Which of the following is a way in which bacteria help the environment?

Accepted Answer

A) They are used to clean water in sewage treatment facilities. 
B) They break down dead organisms in the soil and recycle nutrients. 
C) They remove pollutants from the environment. 
D) All of the above are ways in which bacteria help the environment. 
A) They are used to clean water in sewage treatment facilities. 
B) They break down dead organisms in the soil and recycle nutrients. 
C) They remove pollutants from the environment. 
D) All of the above are ways in which bacteria help the environment.

Question 11

Nitrogen-fixing bacteria convert atmospheric nitrogen (N2 gas) into ammonium (NH4).Why is this conversion important for life on Earth?

Accepted Answer

A) Ammonium is an important cleaning agent. 
B) Nitrogen gas is toxic. 
C) Ammonium is a very important plant nutrient. 
D) Nitrogen gas leads to global warming. 
A) Ammonium is an important cleaning agent. 
B) Nitrogen gas is toxic. 
C) Ammonium is a very important plant nutrient. 
D) Nitrogen gas leads to global warming.

Question 12

Based on the endosymbiosis theory that highlights where chloroplasts come from, how would you expect chloroplasts to divide when a plant cell divides?

Accepted Answer

A) Via mitosis 
B) Via meiosis 
C) Via binary fission 
D) Via endosymbiosis 
A) Via mitosis 
B) Via meiosis 
C) Via binary fission 
D) Via endosymbiosis

Question 13

Which is not a method bacteria use to generate new combinations of genes?

Accepted Answer

A) Transformation 
B) Transduction 
C) Binary fission 
D) Conjugation 
A) Transformation 
B) Transduction 
C) Binary fission 
D) Conjugation

Question 14

HIV, the virus that causes AIDS in humans, does not infect other animals, but only certain cells in the human body.Why?

Accepted Answer

The recognition spikes on the

Question 15

Viruses that infect bacteria are called ________.

Accepted Answer

A) bacteriophages 
B) plasmids 
C) viroids 
D) vectors 
A) bacteriophages 
B) plasmids 
C) viroids 
D) vectors

Question 16

Halophiles are a type of ________.

Accepted Answer

A) Bacteria 
B) Archaea 
C) Eukarya 
D) Animals 
A) Bacteria 
B) Archaea 
C) Eukarya 
D) Animals

Question 17

Prokaryotic organisms are present in how many domains?

Accepted Answer

A) One 
B) Two 
C) Three 
D) Four 
A) One 
B) Two 
C) Three 
D) Four

Question 18

The protists are grouped together simply for convenience.Why are they not considered to be in a specific taxon such as a kingdom or a phylum?

Accepted Answer

They evolved independently on

Question 19

What are plasmids?

Accepted Answer

A) Small, circular DNA molecules that contain just a few genes and that can be passed on to other bacteria 
B) Small, circular RNA molecules that contain just a few genes and that can be passed on to other bacteria 
C) Small, circular DNA molecules that contain just a few genes but that cannot be passed on to other bacteria 
D) Small, circular RNA molecules that contain many genes but that cannot be passed on to other bacteria 
A) Small, circular DNA molecules that contain just a few genes and that can be passed on to other bacteria 
B) Small, circular RNA molecules that contain just a few genes and that can be passed on to other bacteria 
C) Small, circular DNA molecules that contain just a few genes but that cannot be passed on to other bacteria 
D) Small, circular RNA molecules that contain many genes but that cannot be passed on to other bacteria

Question 20

Which specific cells are infected by the HIV virus?

Accepted Answer

A) Killer B cells 
B) Helper T cells 
C) Red blood cells 
D) All body cells are infected by the HIV virus 
A) Killer B cells 
B) Helper T cells 
C) Red blood cells 
D) All body cells are infected by the HIV virus

Evaluate the following statements.Which one is most accurate?

When did the first eukaryotic cells form?

Which protective structure forms to protect certain bacteria during periods of harsh conditions?

Which of the following organisms are classified within the protists under algae?

How do viruses make copies of themselves?

Pathogen is ________.

How old is our planet Earth?

Why could prokaryotes survive without eukaryotes but eukaryotes could not survive without prokaryotes?

Food poisoning is often caused by a bacterium called ________.

Which of the following is a way in which bacteria help the environment?

Nitrogen-fixing bacteria convert atmospheric nitrogen (N₂ gas) into ammonium (NH₄).Why is this conversion important for life on Earth?

Based on the endosymbiosis theory that highlights where chloroplasts come from, how would you expect chloroplasts to divide when a plant cell divides?

Which is not a method bacteria use to generate new combinations of genes?

HIV, the virus that causes AIDS in humans, does not infect other animals, but only certain cells in the human body.Why?

Viruses that infect bacteria are called ________.

Halophiles are a type of ________.

Prokaryotic organisms are present in how many domains?

The protists are grouped together simply for convenience.Why are they not considered to be in a specific taxon such as a kingdom or a phylum?

What are plasmids?

Which specific cells are infected by the HIV virus?

An Introduction to the Science of Life

The Chemistry of Life

The Cell: The Fundamental Unit of Life

Energy and Life

Chromosomes and Inheritance

DNA: The Molecule of Life

Darwinian Evolution

Biodiversity 2: Fungi and Plants

Biodiversity 3: Animals

Human Body Systems

Ecology

Biology The Core: Appendix

Filters

Exam 8: Biodiversity 1: Microscopic Organisms

Evaluate the following statements.Which one is most accurate?

When did the first eukaryotic cells form?

Which protective structure forms to protect certain bacteria during periods of harsh conditions?

Which of the following organisms are classified within the protists under algae?

How do viruses make copies of themselves?

Pathogen is ________.

How old is our planet Earth?

Why could prokaryotes survive without eukaryotes but eukaryotes could not survive without prokaryotes?

Food poisoning is often caused by a bacterium called ________.

Which of the following is a way in which bacteria help the environment?

Nitrogen-fixing bacteria convert atmospheric nitrogen (N2 gas) into ammonium (NH4).Why is this conversion important for life on Earth?

Based on the endosymbiosis theory that highlights where chloroplasts come from, how would you expect chloroplasts to divide when a plant cell divides?

Which is not a method bacteria use to generate new combinations of genes?

HIV, the virus that causes AIDS in humans, does not infect other animals, but only certain cells in the human body.Why?

Viruses that infect bacteria are called ________.

Halophiles are a type of ________.

Prokaryotic organisms are present in how many domains?

The protists are grouped together simply for convenience.Why are they not considered to be in a specific taxon such as a kingdom or a phylum?

What are plasmids?

Which specific cells are infected by the HIV virus?

An Introduction to the Science of Life

The Chemistry of Life

The Cell: The Fundamental Unit of Life

Energy and Life

Chromosomes and Inheritance

DNA: The Molecule of Life

Darwinian Evolution

Biodiversity 2: Fungi and Plants

Biodiversity 3: Animals

Human Body Systems

Ecology

Biology The Core: Appendix

Filters

Nitrogen-fixing bacteria convert atmospheric nitrogen (N₂ gas) into ammonium (NH₄).Why is this conversion important for life on Earth?