Multiple Choice
1.
The term prokaryotes refers to which of the following?
- very small organisms
- unicellular organisms that have no nucleus
- multicellular organisms
- cells that resemble animal cells more than plant cells
2.
The term microbiota refers to which of the following?
- all microorganisms of the same species
- all of the microorganisms involved in a symbiotic relationship
- all microorganisms in a certain region of the human body
- all microorganisms in a certain geographic region
3.
Which of the following refers to the type of interaction between two prokaryotic populations in which one population benefits and the other is not affected?
- mutualism
- commensalism
- parasitism
- neutralism
4.
Which of the following describes Proteobacteria in domain Bacteria?
- phylum
- class
- species
- genus
5.
Which of the following Alphaproteobacteria is the cause of Rocky Mountain spotted fever and typhus?
- Bartonella
- Coxiella
- Rickettsia
- Ehrlichia
- Brucella
6.
Class Betaproteobacteria includes all but which of the following genera?
- Neisseria.
- Bordetella.
- Leptothrix.
- Campylobacter.
7.
Haemophilus influenzae is a common cause of which of the following?
- influenza
- dysentery
- upper respiratory tract infections
- hemophilia
8.
Which of the following is the organelle that spirochetes use to propel themselves?
- plasma membrane
- axial filament
- pilum
- fimbria
9.
Which of the following bacteria are the most prevalent in the human gut?
- cyanobacteria
- staphylococci
- Borrelia
- Bacteroides
10.
Which of the following refers to photosynthesis performed by bacteria with the use of water as the donor of electrons?
- oxygenic
- anoxygenic
- heterotrophic
- phototrophic
11.
Which of the following bacterial species is classified as high G+C gram-positive?
- Corynebacterium diphtheriae
- Staphylococcus aureus
- Bacillus anthracis
- Streptococcus pneumonia
12.
The term “deeply branching” refers to which of the following?
- the cellular shape of deeply branching bacteria
- the position in the evolutionary tree of deeply branching bacteria
- the ability of deeply branching bacteria to live in deep ocean waters
- the pattern of growth in culture of deeply branching bacteria
13.
Which of these deeply branching bacteria is considered a polyextremophile?
- Aquifex pyrophilus
- Deinococcus radiodurans
- Staphylococcus aureus
- Mycobacterium tuberculosis
14.
Archaea and Bacteria are most similar in terms of their ________.
- genetics
- cell wall structure
- ecology
- unicellular structure
15.
Which of the following is true of archaea that produce methane?
- They reduce carbon dioxide in the presence of nitrogen.
- They live in the most extreme environments.
- They are always anaerobes.
- They have been discovered on Mars.
- Entertainment & Pop Culture
- Geography & Travel
- Health & Medicine
- Lifestyles & Social Issues
- Literature
- Philosophy & Religion
- Politics, Law & Government
- Science
- Sports & Recreation
- Technology
- Visual Arts
- World History
- On This Day in History
- Quizzes
- Podcasts
- Dictionary
- Biographies
- Summaries
- Top Questions
- Week In Review
- Infographics
- Demystified
- Lists
- #WTFact
- Companions
- Image Galleries
- Spotlight
- The Forum
- One Good Fact
- Entertainment & Pop Culture
- Geography & Travel
- Health & Medicine
- Lifestyles & Social Issues
- Literature
- Philosophy & Religion
- Politics, Law & Government
- Science
- Sports & Recreation
- Technology
- Visual Arts
- World History
- Britannica Classics
Check out these retro videos from Encyclopedia Britannica’s archives. - Demystified Videos
In Demystified, Britannica has all the answers to your burning questions. - #WTFact Videos
In #WTFact Britannica shares some of the most bizarre facts we can find. - This Time in History
In these videos, find out what happened this month (or any month!) in history. - Britannica Explains
In these videos, Britannica explains a variety of topics and answers frequently asked questions.
- Buying Guide
Expert buying advice. From tech to household and wellness products. - Student Portal
Britannica is the ultimate student resource for key school subjects like history, government, literature, and more. - COVID-19 Portal
While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today. - 100 Women
Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians. - Britannica Beyond
We’ve created a new place where questions are at the center of learning. Go ahead. Ask. We won’t mind. - Saving Earth
Britannica Presents Earth’s To-Do List for the 21st Century. Learn about the major environmental problems facing our planet and what can be done about them! - SpaceNext50
Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!