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( Viruses ( Session 8

الكلية كلية طب حمورابي     القسم الكلية ذات القسم الواحد     المرحلة 1
أستاذ المادة نيران كاظم فرهود الربيعي       24/04/2019 19:15:23
Viruses ( Session 8 )
Brief History of Virus Discovery
- Are agents that can’t be seen with an ordinary light microscope
- Are agents that pass through filters that can trap even the smallest bacteria
- The question that arose was are these agents toxins or poisons?
- The Latin word for poison is virus
Viruses Doesn’t belong to any kingdom.
It’s not a plant or an animal.
It’s not a fungi, protist, or bacteria.
• What is a virus?
• Is it living or nonliving?
• How are they different from other “living” organisms?
• Submicroscopic 18-350 nm in size (10-9 M)
• Can only be “seen” with an electron microscope.
• Obligate intracellular parasites.
Biologists consider viruses to be non-living.
Viruses have no genes that encode the proteins that function as the metabolic machinery for energy generation.
Viruses have no genes that encode the proteins that function as the metabolic machinery for protein synthesis.
A virus is an infectious agent made up of nucleic acid (DNA or RNA) wrapped in a protein coat called a capsid.
May enveloped viruses or non-enveloped viruses (naked viruses), Envelope which is a lipoprotein membrane, the lipid of it is derived from the host cell membrane and the protein is virus-specific.

• What is the basic structure of a virus?
– Nucleic acid of RNA or DNA – is the genetic information for the virus
• Single (ss) or double stranded (ds)
• Linear, circular, or nicked.
• Unsegmented or segmented.
• If SS RNA, may be of the  positive-sense (+) or negative-sense (-), + RNA : genomic RNA can serve as mRNA and be directly
translated into protein,- RNA : genomic RNA cannot serve as mRNA and cannot be translated directly into protein


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 .