Human Biology: Concepts and Current Issues
7th Edition
ISBN: 9780321821652
Author: Michael D. Johnson
Publisher: Benjamin Cummings
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Chapter 9, Problem 2CR
Summary Introduction
To review:
The unusual characteristics about viruses, due to which sometimes they are considered as living things and sometimes as nonliving entities.
Introduction:
Viruses are the most dangerous infectious agent. It is very simple in structure. It consists of small pieces of genetic material that is either RNA (ribonucleic acid) or DNA (deoxyribonucleic acid). Its genetic material is enclosed in a protein coat. It can cause different types of severe illness such as AIDS (acquired immunodeficiency virus).
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Give some example of animal viruses.
Give one reason for the fact that various viruses have different host ranges.
Describe the DNA viruses and RNA viruses with the help of example.
Chapter 9 Solutions
Human Biology: Concepts and Current Issues
Ch. 9 - Prob. 1QCCh. 9 - Prob. 2QCCh. 9 - Define the term pathogen and give some examples.Ch. 9 - Prob. 2CRCh. 9 - Prob. 3CRCh. 9 - Prob. 4CRCh. 9 - Prob. 5CRCh. 9 - Describe in general terms the distinction between...Ch. 9 - Describe the concept of an antigen and how it...Ch. 9 - Prob. 8CR
Ch. 9 - Prob. 9CRCh. 9 - Prob. 10CRCh. 9 - Prob. 1TYCh. 9 - Prob. 2TYCh. 9 - Prob. 3TYCh. 9 - Prob. 4TYCh. 9 - Prob. 5TYCh. 9 -
6. Which of the following is a benefit of...Ch. 9 - Prob. 7TYCh. 9 -
8. The following are steps in phagocytosis: (1)...Ch. 9 - Prob. 9TYCh. 9 - Prob. 10TYCh. 9 - Prob. 11TYCh. 9 - Prob. 12TYCh. 9 - Which of the following increases the likelihood of...Ch. 9 - Which of the following does not belong with the...Ch. 9 - Which of the following statements about HIV is...Ch. 9 - Prob. 1AWKCh. 9 - Prob. 2AWKCh. 9 -
3. Everyone knows that bacteria can cause...Ch. 9 - Prob. 4AWKCh. 9 - Prob. 5AWKCh. 9 - Why is it that most people get the chicken pox...Ch. 9 - The immune system is supposed to defend us from...
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- Which statement is true of viral replication? a. In the process of apoptosis, the cell survives. b. During attachment, the virus attaches at specific sites on the cell surface. c. The viral capsid helps the host cell produce mow copies of the viral genome. d. mRNA works outside of the host cell to produce enzymes and proteins.arrow_forwardFigure 17.5 Which of the following statements about virus structure is true? a. All viruses are encased in a viral membrane. b. The capsomere is made up of small protein subunits called capsids. c. DNA is the genetic material in all viruses. d. Glycoproteins help the virus attach to the host cell.arrow_forwardWhich statement is true? a. A virion contains DNA and RNA. b. Viruses are acellular. c. Viruses replicate outside of the cell. d. Most viruses are easily visualized with a light microscope.arrow_forward
- Is a Virus considered living or non-living? Justify your answer and Give one example of a virus.arrow_forwardDescribe how viruses bind to host cells, and how they spread to other cells.arrow_forwarda. Since viruses lack metabolic enzymes, how can they synthesize necessary components? b. Name some enzymes that viruses may have for invading and completing their cycles.arrow_forward
- Describe the properties of virus particles that contribute to their survival in the environment and transmission to cause human infectionarrow_forwardA complete functional virus that has the capacity to infect the living tissue. A. NOTA B. Virophage C. Viroid D. Bacteriophage E. VIRIONarrow_forwardA class of RNA viruses that possess reverse transcriptase activity are called _____________.arrow_forward
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What Is A Virus ? ; Author: Peekaboo Kidz;https://www.youtube.com/watch?v=YS7vsBgWszI;License: Standard YouTube License, CC-BY