هل تبحث عن مقالة (ايسي essay) باللغة الانجليزية عن الكائنات وحيدة الخلية Unicellular organism وتحتاج إلى استعمالها في القسم أو المدرسة أو الجامعة؟ هذه الايسي essay سوف تفيدك كثيرا, , تحتوي هذه المقالة essay على معلومات مهمة, كما أنها تفيدك في كتابة مقالتك الخاصة, كما أن هذه المقالة قد كتبت بطريقة تتبع سهلة ومنهجية رائعة تساعد على اكتساب وتعلم اللغة الانجليزية.
A unicellular organism, also known as a single-celled organism, is an organism that consists of only one cell, in contrast to a multicellular organism that consists of multiple cells. Historically simple single celled organisms have sometimes been referred to as monads.[1]
Prokaryotes, most protists, and some kinds of fungi are unicellular. Although some of these organisms live in colonies, they are still unicellular. These organisms live together, and each cell in the colony is the same. However, each cell must carry out all life processes in order for that cell to survive. In contrast, even the simplest multicellular organisms have specialized cells that depend on each other in order to survive.
Most unicellular organisms are of microscopic size and are thus classified as microorganisms. However, some unicellular protists and bacteria are macroscopic and visible to the naked eye.[2] Examples include:
Xenophyophores are the largest examples known, with Syringammina fragilissima achieving a diameter of up to 20 cm.[3]
Valonia ventricosa, of the class Chlorophyceae, can achieve a diameter of 1 to 4 cm.[4][5]
Thiomargarita namibiensis is the largest bacteria, achieving a diameter of up to 0.75 mm.
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