The process of grouping things based on their similarities

An organism whose cells lack a nucleus and some other cell structures.

A type of organism that is made up of a single cell.

The process where one unicellular organism transfers some of its genetic material to another unicellular organism through a thin, threadlike tube that joins the two organisms

Bacteria that consume other organisms.

The two-part naming system for organisms in which each organism is given a genus and a species name

An organism that causes disease.

A long, whiplike structure that helps a unicellular organism move.

The reproductive process that involves two parents who combine their genetic material to produce a new organism, which differs from both parents.

Bacteria that exist in environments with no oxygen.

The first part of an organism's scientific name. The second smallest grouping in the classification system.

An organism with cells that contain a nuclei with a nuclear membrane.

Organisms that consume dead organisms and break down large chemicals into small chemicals

A disease that can pass from one organism to another

Scientists that study bacteria and other microscopic organisms.

A group of closely related organisms whose members can mate with one another and produce fertile offspring.

A small, rounded thick-walled resting cell that forms inside some bacterial cells during unfavorable environmental conditions.

A single-celled prokaryote belonging to one of two kingdoms - Archaebacteria or Eubacteria.

A series of paired statements that describe the physical characteristics of different organisms. It is used for identification purposes.

The type of reproduction that involves only one parent organism and no exchange of genetic material.

The scientific study of how living things are classified?

A chemical that kills bacteria or slows down their growth.

A type of asexual reproduction in which one cell divides to from two identical cells.

Bacteria that produce their own food.

The type of asexual reproduction where the parent organism divides to form two identical cells (2 words).