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Chapter 11, section 1 Viruses LT: I can describe the structure and function of a virus Agree 1._______ Disagree Viruses are the smallest form of life on ________ Earth. The flu and the common cold are caused by viruses. 2._______ ________ 3._______ Viruses make you sick by taking control ________ over your own cells. 4._______ West Nile virus exists in Egypt, but has not ________ been found yet in the United States. 5._______ ________ You can get sick from the same viral disease multiple times in your life. http://htwins.net/scale2/ I. Viruses A. Virus – tiny, nonliving particle that enters and reproduces inside a cell. B. Host Cell – cell used by a virus to reproduce C. Viruses act like parasites by using the host cell. II. Structure of Viruses A. All viruses have a protein coat outside and genetic material inside. B. Surface Proteins - are used to lock on to a cell membrane. III. Virus Reproduction A. Virus inserts its genetic material into the host cell. B. The host cell is used to make new viruses, host cell is destroyed. http://www.youtube.com/watch?v=Rpj0emEGShQ IV. Viral Diseases: -influenza (flu) - chicken pox - West Nile - colds - AIDS (HIV) 1. Many viruses mutate into new strains, so you can catch the disease multiple times. New Science: Are Viruses Living? http://www.youtube.com/watch?v=VvTfkMh Ew3g Agree 1._______ Disagree Viruses are the smallest form of life on ________ Earth. The flu and the common cold are caused by viruses. 2._______ ________ 3._______ Viruses make you sick by taking control ________ over your own cells. 4._______ West Nile virus exists in Egypt, but has not ________ been found yet in the United States. 5._______ ________ You can get sick from the same viral disease multiple times in your life. http://www.youtube.com/watch?v=YSgkoldBNkI • Page 446 • Complete 1-3 You can either complete A,B,C Will be homework if you do not complete in class.