
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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- You are arguing with one of your classmates. They say viruses are living, you say they are not. What argument would you give that they are non-living entities? – Think about the structure and function of viruses
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- The different major groups of viruses (families) differ in: host range. the type of genetic material they have. virion size. genome size. presence or absence of an envelope.arrow_forwardWhich one of the following is not true for virus, obligate intracellular parasites? Viruses cannot generate energy outside of cells Viruses cannot synthesize proteins outside of cells Enveloped viruses require host cell membrane to obtain their envelopes Viruses must degrade host cell DNA in order to obtain nucleotidesarrow_forwardViruses are made up of the same biomolecules as cellular organisms (DNA, RNA, proteins, lipids, etc.), which are synthesized through enzymatic dehydration reactions from building blocks and disassembled by enzymatic hydrolysis. They infect cells and replicate themselves using resources from the host cells. Scientists discovered a previously unknown strain of virus in the tropical Pacific Ocean and it can infect higher-order eukaryotes. Initial analysis revealed that the virus is mainly composed of nucleic acids, proteins, and lipids. Chemical analysis after complete hydrolysis revealed the following building blocks (by weight): Chemical components Nucleosides Amino acids Lipids, phosphates, and carbohydrates Percentage by weight 20 30 50 Analysis of percentages of nucleosides yielded the following results (by molar ratio): Nucleosides A G T C U Percentage by mole 19 29 19 29 4 Which of the following events mostly involves hydrolysis reaction after the virus infects…arrow_forward
- TRUE or FALSE: All icosahedral viruses are enveloped. - Bacteriophages containing icosahedral heads attached to helical tails have this type of capsid structure: Modified Complex Icosahelical Helicosahedronarrow_forwardViruses are often considered “not quite alive". Using your knowledge of the characteristics of life, describe 4 ways that viruses fail to meet the standard definition of life.arrow_forwardWhich type of virus must contain an RNA replicase packaged in the viral particle in order to carry out its replicative cycle? A (+) ssRNA virus O A dsDNA virus A (+) ssDNA virus OA (-) ssRNA virusarrow_forward
- Which one of the numbers below is the minimum number of capsomer proteins to make a spherical virus? оооо о 40 Ⓒ50 60 70 80arrow_forwardWhat is the basic classification of viruses. In other words, if you find a new virus, what is the first thing to determine? A. Is this a DNA or an RNA virus? B. Does it cause blue snotty nosed fever? C. does it have a vector? D. does it infect humans?arrow_forwardWhich of the following is NOT a characteristic of viruses? they are smaller than prokaryotic cells Othey are acellular (no cellular structure) they are obligatory parasites. Othey are visible with a light microscope Savedarrow_forward
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