Microbiology Exam 2 - TAMU BIOL 206 questions with correct answers

General Characteristic of a Virus CORRECT ANSWER -Can have DNA or RNA, but not both -Have no ribosomes -No ATP-generating mechanism -Are infectious Define: Obligate Intracellular Parasite CORRECT ANSWER Needs a host cell in order to replicate What is a Capsid? CORRECT ANSWER A protein coat that encloses and protects the viruses nucleic acid. -All viruses have capsids What is a Capsomer? CORRECT ANSWER Identical protein sub-units that makeup the capsid. May be made up of one or several proteins. What is the Nucelocapsid? CORRECT ANSWER The capsid together with the nucleic acid forms the nucleocapsid. Two Capsid structure types CORRECT ANSWER -Helical: Continuous helix of capsomeres forming a cylindrical nucelocapsid. -Polyhedral: Also called icosohedral. 20 sided with 12 corners. Some are enveloped