Domains

Front

Bacteria Noun

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[bak-TEER-ee-uh]

Back

Bacteria

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Very tiny, single-celled organisms that are the most abundant life forms on Earth and are found everywhere.

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Example: This diagram shows a bacterium, highlighting its structure as a single-celled organism.

Front

Organism Noun

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[OR-guh-niz-um]

Back

Organism

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A single, living being, such as an animal, plant, fungus, or bacterium, that can carry out life processes.

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Example: A bacterium is a single-celled organism that can carry out life processes.

Front

Species Noun

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[SPEE-sheez]

Back

Species

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A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding to produce fertile offspring.

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Example: Different species like penguin, tiger, and butterfly show groups of similar organisms.

Front

Micrometer Noun

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[my-KROM-i-ter]

Back

Micrometer

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A unit of length equal to one-millionth of a meter, used for measuring microscopic objects like bacteria.

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Example: The image shows a micrometer scale, illustrating how to read precise measurements.

Front

Colonies Noun

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[KOL-uh-neez]

Back

Colonies

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Visible masses or groups of microorganisms, like bacteria, growing together, often in a laboratory culture.

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Example: Bacterial colonies growing in a petri dish show how microorganisms form visible groups.

Front

Microscope Noun

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[MY-kruh-skohp]

Back

Microscope

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An instrument that uses lenses to make very small objects appear larger, allowing them to be seen.

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Example: This diagram shows the parts of a microscope, helping students understand how it enlarges small objects using lenses.

Front

Organelles Noun

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[or-guh-NELZ]

Back

Organelles

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Specialized structures within a cell that perform specific functions; these are absent in bacterial cells.

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Example: The image shows organelles inside an animal cell, each labeled to identify their functions.

Front

Nucleus Noun

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[NOO-klee-us]

Back

Nucleus

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The structure in a cell that contains the genetic material; prokaryotes like bacteria do not have one.

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Example: The image shows the nucleus of a cell with labeled parts like the nucleolus and chromatin, explaining its structure.

Front

Prokaryotes Noun

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[pro-KAIR-ee-ohts]

Back

Prokaryotes

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Single-celled organisms, such as bacteria, that lack a nucleus and other membrane-bound organelles.

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Example: This diagram shows a bacterium, a prokaryote, with labeled parts like the nucleoid, illustrating its lack of a nucleus.

Front

Cell wall Noun

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[sel wawl]

Back

Cell wall

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A rigid layer that surrounds the cell membrane of bacteria, providing structural support and protection.

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Example: The image shows the cell wall's layers and components, like cellulose and pectin, providing structural support.