Question 1

If prokaryotes were unable to convert nitrogen gas into ammonia or nitrate,how would life on Earth be different than it is today?

Accepted Answer

Plants require nitrogen fixation by prokaryotes.If prokaryotes were unable to perform this role,plants would not be able to survive.Any organisms,including humans,that rely on plants would not exist.

Question 2

Beginning with a single bacterium for generation 0,calculate the number of cells present at
generation 4.

Accepted Answer

The number of cells present at generation 4 is 16.Each cell will divide into two cells during a generation.The single starting cell becomes two cells (generation 1).Those two divide into four cells (generation 2).Four cells divide into eight cells (generation 3),and those eight divide into 16 cells (generation 4).

Question 3

Cells that lack membrane-enclosed organelles and have a single loop of DNA may be

Accepted Answer

A)  bacteria only. 
B)  archaea only. 
C)  eukaryotes only. 
D)  either bacteria or archaea. 
A)  bacteria only. 
B)  archaea only. 
C)  eukaryotes only. 
D)  either bacteria or archaea. D

Question 4

As a group,prokaryotes

Accepted Answer

A)  live in extreme environments and lack a nucleus. 
B)  are single-celled and possess pili. 
C)  are single-celled and lack a nucleus. 
D)  obtain energy from inorganic chemicals. 
A)  live in extreme environments and lack a nucleus. 
B)  are single-celled and possess pili. 
C)  are single-celled and lack a nucleus. 
D)  obtain energy from inorganic chemicals.

Question 5

The term "extremophiles" is sometimes used to describe ________ based on the environments in which they live.

Accepted Answer

A)  archaeans 
B)  bacteria 
C)  prokaryotes 
D)  eukaryotes 
A)  archaeans 
B)  bacteria 
C)  prokaryotes 
D)  eukaryotes

Question 6

Prokaryotes that are observed "swimming" through a liquid environment most likely possess

Accepted Answer

A)  pili. 
B)  a capsule. 
C)  a flagellum. 
D)  a nucleus. 
A)  pili. 
B)  a capsule. 
C)  a flagellum. 
D)  a nucleus.

Question 7

Prokaryotes described as chemoautotrophs are represented by the category labeled ________ in the figure below.

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
A)  A 
B)  B 
C)  C 
D)  D

Question 8

Archaeans found in deep-sea hydrothermal vents would be expected to

Accepted Answer

A)  use carbon dioxide in photosynthesis. 
B)  obtain energy from inorganic chemicals. 
C)  produce oxygen gas as a by-product. 
D)  obtain energy from sunlight. 
A)  use carbon dioxide in photosynthesis. 
B)  obtain energy from inorganic chemicals. 
C)  produce oxygen gas as a by-product. 
D)  obtain energy from sunlight.

Question 9

Prokaryotes that are observed attaching onto nonliving surfaces most likely possess

Accepted Answer

A)  pili. 
B)  a capsule. 
C)  a flagellum. 
D)  a nucleus. 
A)  pili. 
B)  a capsule. 
C)  a flagellum. 
D)  a nucleus.

Question 10

A prokaryote that uses carbon dioxide for photosynthesis and sunlight for energy is called a(n)________.

Accepted Answer

The answer of A prokaryote that uses carbon dioxide for...

Question 11

Why do prokaryotes reproduce more rapidly than single-celled eukaryotes?

Accepted Answer

A)  Only prokaryotes use asexual reproduction. 
B)  Prokaryotes have much less DNA than eukaryotes. 
C)  Prokaryotes live in more diverse environments. 
D)  Prokaryotes use pili to adhere to each other. 
A)  Only prokaryotes use asexual reproduction. 
B)  Prokaryotes have much less DNA than eukaryotes. 
C)  Prokaryotes live in more diverse environments. 
D)  Prokaryotes use pili to adhere to each other.

Question 12

Bacterial conjugation is the process in which a bacterium

Accepted Answer

A)  splits in two. 
B)  exchanges DNA directly with another bacterium. 
C)  adheres to a surface to form a biofilm. 
D)  takes in DNA from its environment. 
A)  splits in two. 
B)  exchanges DNA directly with another bacterium. 
C)  adheres to a surface to form a biofilm. 
D)  takes in DNA from its environment.

Question 13

A single-celled organism has linear DNA enclosed within a nucleus.This organism must be a(n)

Accepted Answer

A)  eukaryote because it has a nucleus. 
B)  bacterium because it is single-celled. 
C)  archaean because it has linear DNA. 
D)  prokaryote because it has a nucleus. 
A)  eukaryote because it has a nucleus. 
B)  bacterium because it is single-celled. 
C)  archaean because it has linear DNA. 
D)  prokaryote because it has a nucleus.

Question 14

A prokaryotic cell and a eukaryotic cell are placed in an environment ideal for growth of both cells.After 24 hours it is observed that the prokaryote cell population is significantly higher than the eukaryote cell population.This has occurred because prokaryotes

Accepted Answer

A)  use quorum sensing to inhibit growth of eukaryotes. 
B)  have a simpler structure,which allows more rapid reproduction. 
C)  were the earliest life-forms on Earth. 
D)  are single-celled and eukaryotes are all multicellular. 
A)  use quorum sensing to inhibit growth of eukaryotes. 
B)  have a simpler structure,which allows more rapid reproduction. 
C)  were the earliest life-forms on Earth. 
D)  are single-celled and eukaryotes are all multicellular.

Question 15

A citizen scientist documenting dates when migratory birds arrive in an area are participating in data ________.

Accepted Answer

The answer of A citizen scientist documenting dates when migratory...

Question 16

Which of the following groups of characteristics defines prokaryotes?

Accepted Answer

A)  single-celled,membrane-enclosed organelles,nucleus,asexual reproduction 
B)  single or multicellular,no nucleus,single loop of DNA,sexual reproduction 
C)  single-celled,single loop of DNA,no membrane-enclosed organelles,asexual reproduction 
A)  single-celled,membrane-enclosed organelles,nucleus,asexual reproduction 
B)  single or multicellular,no nucleus,single loop of DNA,sexual reproduction 
C)  single-celled,single loop of DNA,no membrane-enclosed organelles,asexual reproduction

Question 17

One of the earliest prokaryotes on Earth played an important role in the evolution of multicellular eukaryotes.These early prokaryotes changed Earth's chemistry when they began

Accepted Answer

A)  recycling nutrients locked in organic matter. 
B)  to produce oxygen as a by-product of photosynthesis. 
C)  capturing energy from inorganic iron ore. 
D)  to exist in oxygen-free environments. 
A)  recycling nutrients locked in organic matter. 
B)  to produce oxygen as a by-product of photosynthesis. 
C)  capturing energy from inorganic iron ore. 
D)  to exist in oxygen-free environments.

Question 18

If a professional scientist is trying to build an extensive database of bacterial swabs from humans in all parts of the world,what is the most cost-effective way to increase the number of samples collected in a one-year time period?

Accepted Answer

A)  Train citizens to collect samples from the public. 
B)  Hire more researchers to travel around the world. 
C)  Send a single professional scientist to locations throughout the world. 
D)  Pay for citizens around the world to travel to a central laboratory where samples will be collected. 
A)  Train citizens to collect samples from the public. 
B)  Hire more researchers to travel around the world. 
C)  Send a single professional scientist to locations throughout the world. 
D)  Pay for citizens around the world to travel to a central laboratory where samples will be collected.

Question 19

In which of the following environments would archaea be expected but not bacteria?

Accepted Answer

A)  a hydrothermal vent 
B)  a belly button 
C)  water in a cave 
D)  dead matter in shallow water 
A)  a hydrothermal vent 
B)  a belly button 
C)  water in a cave 
D)  dead matter in shallow water

Question 20

Bacteria and archaea are together referred to as ________.

Accepted Answer

The answer of Bacteria and archaea are together referred to...

If prokaryotes were unable to convert nitrogen gas into ammonia or nitrate,how would life on Earth be different than it is today?

Beginning with a single bacterium for generation 0,calculate the number of cells present at generation 4.

Cells that lack membrane-enclosed organelles and have a single loop of DNA may be

As a group,prokaryotes

The term "extremophiles" is sometimes used to describe ________ based on the environments in which they live.

Prokaryotes that are observed "swimming" through a liquid environment most likely possess

Prokaryotes described as chemoautotrophs are represented by the category labeled ________ in the figure below.

Archaeans found in deep-sea hydrothermal vents would be expected to

Prokaryotes that are observed attaching onto nonliving surfaces most likely possess

A prokaryote that uses carbon dioxide for photosynthesis and sunlight for energy is called a(n)________.

Why do prokaryotes reproduce more rapidly than single-celled eukaryotes?

Bacterial conjugation is the process in which a bacterium

A single-celled organism has linear DNA enclosed within a nucleus.This organism must be a(n)

A prokaryotic cell and a eukaryotic cell are placed in an environment ideal for growth of both cells.After 24 hours it is observed that the prokaryote cell population is significantly higher than the eukaryote cell population.This has occurred because prokaryotes

A citizen scientist documenting dates when migratory birds arrive in an area are participating in data ________.

Which of the following groups of characteristics defines prokaryotes?

One of the earliest prokaryotes on Earth played an important role in the evolution of multicellular eukaryotes.These early prokaryotes changed Earth's chemistry when they began

If a professional scientist is trying to build an extensive database of bacterial swabs from humans in all parts of the world,what is the most cost-effective way to increase the number of samples collected in a one-year time period?

In which of the following environments would archaea be expected but not bacteria?

Bacteria and archaea are together referred to as ________.

The Nature of Science

Evaluating Scientific Claims

Chemistry of Life

Life Is Cellular

How Cells Work

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

What Genes Are

How Genes Work

Evidence for Evolution

Mechanisms of Evolution

Adaptation and Species

The History of Life

Plants,fungi,and Protists

Animals and Human Evolution

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Exam 15: Bacteria and Archaea

If prokaryotes were unable to convert nitrogen gas into ammonia or nitrate,how would life on Earth be different than it is today?

Beginning with a single bacterium for generation 0,calculate the number of cells present at generation 4.

Cells that lack membrane-enclosed organelles and have a single loop of DNA may be

As a group,prokaryotes

The term "extremophiles" is sometimes used to describe ________ based on the environments in which they live.

Prokaryotes that are observed "swimming" through a liquid environment most likely possess

Prokaryotes described as chemoautotrophs are represented by the category labeled ________ in the figure below.

Archaeans found in deep-sea hydrothermal vents would be expected to

Prokaryotes that are observed attaching onto nonliving surfaces most likely possess

A prokaryote that uses carbon dioxide for photosynthesis and sunlight for energy is called a(n)________.

Why do prokaryotes reproduce more rapidly than single-celled eukaryotes?

Bacterial conjugation is the process in which a bacterium

A single-celled organism has linear DNA enclosed within a nucleus.This organism must be a(n)

A prokaryotic cell and a eukaryotic cell are placed in an environment ideal for growth of both cells.After 24 hours it is observed that the prokaryote cell population is significantly higher than the eukaryote cell population.This has occurred because prokaryotes

A citizen scientist documenting dates when migratory birds arrive in an area are participating in data ________.

Which of the following groups of characteristics defines prokaryotes?

One of the earliest prokaryotes on Earth played an important role in the evolution of multicellular eukaryotes.These early prokaryotes changed Earth's chemistry when they began

If a professional scientist is trying to build an extensive database of bacterial swabs from humans in all parts of the world,what is the most cost-effective way to increase the number of samples collected in a one-year time period?

In which of the following environments would archaea be expected but not bacteria?

Bacteria and archaea are together referred to as ________.

The Nature of Science

Evaluating Scientific Claims

Chemistry of Life

Life Is Cellular

How Cells Work

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

What Genes Are

How Genes Work

Evidence for Evolution

Mechanisms of Evolution

Adaptation and Species

The History of Life

Plants,fungi,and Protists

Animals and Human Evolution

Filters