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bacterium

Primary Information
Secondary Information

Definition

A bacterium is a single-celled organism that is the smallest form of life. Bacteria are found everywhere in the world, including in the air, water, soil, and on our bodies.

Bacteria are classified as prokaryotes, which means that they do not have a nucleus or other membrane-bound organelles. Instead, their DNA is found in the cytoplasm, which is the jelly-like substance that makes up the cell.

Bacteria reproduce by binary fission, which means that they divide in half to create two new cells. This process can happen very quickly, so bacteria can multiply rapidly.

Some bacteria are beneficial, while others can cause disease. Beneficial bacteria help to break down organic matter, produce food, and protect us from harmful bacteria. Harmful bacteria can cause infections, food poisoning, and other diseases.

There are many different ways to prevent and treat bacterial infections. Some common methods include handwashing, using antibiotics, and getting vaccinated.

A bacterium is the singular form of the plural word "bacteria".

How can the word be used?

Bacteria are single-celled organisms that are found in all environments.

bacterium

Different forms of the word

Singular: bacterium.

Plural: bacteria.

Adjective: bacterial.

Adverb: bacterially.

Noun: bacteriology.

Verb: to bacterize.

Etymology

The word "bacterium" comes from the Greek word βακτήριον (bakterion), which means "small staff" or "little rod." The Greek word βακτήριον is derived from the Proto-Indo-European root bhag-, which means "to grow.".

Question

What is the difference between bacterium and bacteria?

AQA Science Exam Question and Answer

Question:

What are the different shapes of bacteria and what are the functions of these shapes?

Answer:

Bacteria come in a variety of shapes, each with its own function. Some common bacterial shapes include:

  • Spherical: These are the most common type of bacteria. They are round and smooth, and they can be found in clusters or chains.
  • Cocci: These are spherical bacteria that are arranged in pairs or in groups of four.
  • Cocci bacteria.
  • Bacilli: These are rod-shaped bacteria. They can be found individually, in pairs, or in chains.
  • Spirilla: These are spiral-shaped bacteria. They can be found individually or in chains.
  • Vibrio: These are comma-shaped bacteria. They can be found individually or in groups.