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Bacterial Cell

الكلية كلية الهندسة     القسم  الهندسة البيئية     المرحلة 1
أستاذ المادة اشواق مخيف سلمان حبيب الجبوري       11/07/2018 19:24:00
The cell is the structural and functional unit of life. All living organisms on earth are made up of single or many cells.
Bacteria are single cellular microscopic organisms. The study of bacteria is known as bacteriology and it is a branch of microbiology. The singular world of bacteria is bacterium. Bacteria have been grouped into prokaryotic, which means absence of nucleus.
Characteristics of Bacteria


? There are 3 types of bacteria based on their shapes such as: Bacteria grow in number not in size, but they make copies of themselves by dividing into half. There are three basic shapes of bacteria:
• Rod shaped bacteria called as bacilli.
• Spherical shaped bacteria called as cocci.

• Curved shaped bacteria called as spirilla.

Some of the bacteria exist as single cells, others exist as cluster together.

Respiration in bacteria:

Anaerobic bacteria: does not require oxygen for respiration.
Aerobic bacteria: require oxygen for respiration.

Gram staining bacteria are a method of differentiating bacterial species into two large groups, which are based on their chemical and physical properties of their cell wall.
Gram positive bacteria: Those bacteria when they are stained in gram stain results in purple colour.
Gram negative bacteria: Those bacteria when they are stained in gram stain results in pink colour.
Locomotion of bacteria:
They move around by using their locomotion organs such as cilia and flagella.

Nutrition of bacteria:
They exhibits different modes of nutrition level such as-

• Autotrophic bacteria: These bacteria are able to synthesize their own food. For e.g.: Phototropic bacteria and chemosynthetic bacteria
• Heterotrophic bacteria: These bacteria are unable to synthesize their own food, hence they depends on other organic materials. For e.g.: saprophytic bacteria-these bacteria feeds on dead and decaying matter.


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .