Trivia Questions With Answers!

Bacteria Trivia Quiz Questions

Trivia quiz questions with answers about bacteria

What are bacteria?
A: Bacteria are ubiquitous, mostly free-living organisms often consisting of one biological cell.

Typically a few micrometers in length, bacteria were among the first life forms to do what?
A: To appear on Earth, and are present in most of its habitats.

Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep biosphere of what?
A: Earth's crust.

Bacteria are vital in many stages of the nutrient cycle by doing what?
A: Recycling nutrients such as the fixation of nitrogen from the atmosphere.

The nutrient cycle includes the decomposition of dead bodies; bacteria are responsible for what?
A: The putrefaction stage in this process.


In the biological communities surrounding hydrothermal vents and cold seeps, extremophile bacteria provide the nutrients needed to sustain life by doing what?
A: By converting dissolved compounds, such as hydrogen sulphide and methane, to energy.

Bacteria also live in symbiotic and parasitic relationships with what?
A: Plants and animals.

Most bacteria have not been characterized and there are many species that cannot be grown where?
A: In the laboratory.

The study of bacteria is known as what?
A: Bacteriology, a branch of microbiology.

Humans and most other animals carry how many bacteria?
A: Millions.


Most bacteria on humans are where?
A: In the gut, and there are many on the skin.

Most of the bacteria in and on the body are harmless or rendered so by the protective effects of what?
A: The immune system, though many are beneficial, particularly the ones in the gut.

However, several species of bacteria are pathogenic and cause what?
A: Infectious diseases, including cholera, syphilis, anthrax, leprosy, tuberculosis, tetanus and bubonic plague.

What are the most common fatal bacterial diseases?
A: Respiratory infections.

What are used to treat bacterial infections and are also used in farming?
A: Antibiotics, making antibiotic resistance a growing problem.


Once regarded as plants constituting the class Schizomycetes ("fission fungi"), bacteria are now classified as what?
A: Prokaryotes.

Unlike cells of animals and other eukaryotes, bacterial cells do not contain what?
A: A nucleus and rarely harbor membrane-bound organelles.

Although the term bacteria traditionally included all prokaryotes, the scientific classification changed after the discovery in the 1990s that prokaryotes consist of what?
A: Two very different groups of organisms that evolved from an ancient common ancestor.

These evolutionary domains are called what?
A: Bacteria and Archaea.

The ancestors of bacteria were unicellular microorganisms that were the first forms of life to appear on Earth, about how long ago?
A:  4 billion years ago.


For about 3 billion years, most organisms were microscopic, and bacteria and archaea were the what?
A: The dominant forms of life.

The most recent common ancestor of bacteria and archaea was probably a what?
A: A hyperthermophile that lived about 2.5 billion–3.2 billion years ago.

Bacteria were also involved in the second great evolutionary divergence, that of what?
A: Archaea and eukaryotes.

Bacteria are ubiquitous, living in every possible habitat on the planet including soil, underwater, deep in Earth's crust and even such extreme environments as what?
A: Acidic hot springs and radioactive waste.

There is approximately 2×1030 bacteria on Earth, forming a biomass that is only exceeded by what?
A: Plants.


Most do not cause diseases, are beneficial to their environments, and are essential for what?
A: Life.

The soil is a rich source of bacteria, and a few grams contain how many of them?
A: Around a thousand million of them.

They are all essential to soil ecology by doing what?
A: By breaking down toxic waste and recycling nutrients.

They are even found in the atmosphere and one cubic meter of air holds how many?
A: Around one hundred million bacterial cells.

The oceans and seas harbor around 3 x 1026 bacteria which provide up to 50% of what?
A: The oxygen humans breathe.

How many bacterial species have been fully studied?
A: Around 2%.

Among the smallest bacteria are members of the genus Mycoplasma, which measure only 0.3 micrometers, as small as what?
A: The largest viruses.

© 2022 - All rights reserved.      

Privacy Policy