Modified Masteringbiology With Pearson Etext -- Standalone Access Card -- For Human Biology Format: Access Card Package
8th Edition
ISBN: 9780134326412
Author: Johnson, Michael D.
Publisher: Prentice Hall
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Chapter 9, Problem 2TY
Summary Introduction
Introduction:
Viruses are very small infection-causing pathogens. They either have a DNA (deoxyribonucleic acid) or RNA (ribonucleic acid), which is surrounded mainly by a protein coat. They are intermediates between living and nonliving organisms.
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Which of the following is a reason that scientists do not classify viruses as living things?
A. They must infect a host because they cannot reproduce on their own.
B. They contain DNA, like all living organisms.
C. The experience evolution through natural selection.
D. They replicate themselves and reproduce
Which of the following statements concerning viruses and human health is false?
a-in many diseases caused by viruses, the virus attacks cells as it reproduces
b- many viral diseases can be controlled through vaccinations
c- some viruses can remain dormant in the body for years before disease symptoms appear
d-most viral infections are difficult to treat, but they can be finally destroyed by antibiotics
According to your own understanding, what do you think makes viruses some of the most common disease causing organisms? Explain comprehensively
Chapter 9 Solutions
Modified Masteringbiology With Pearson Etext -- Standalone Access Card -- For Human Biology Format: Access Card Package
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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- The viral ________ plays a role in attaching a virion to the host cell. a. core b. capsid C. envelope d. both b and carrow_forwardWhich of the following statements correctly describes viruses? Select one: A. They can reproduce by dividing. B. They cannot reproduce without a host cell. C. They have a genome similar to prokaryotic and eukaryotic cells. D. They can carry out their own metabolic activities.arrow_forwardWhy don’t scientists usually consider viruses living? A.They do not have DNA B.They do not have cells C.They cannot reproducearrow_forward
- a. 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_forwardWhich of the following refer/s to viruses? A. They are disease-causing. B. They contain DNA or RNA. C. They must have protection for their own genetic material. D. They are parasitic. A, B, C only A, B, C, D A, C, D B, C, Darrow_forwardWhich of the following does NOT inititiate DNA synthesis? a. a single-stranded DNA virus. b. a (-) single stranded RNA virus c. a (+) single stranded RNA virus d. a double-stranded DNA virus (Poxviridae) e. Both (-) and (+) single-stranded RNA virusesarrow_forward
- Which of the following is a property of life that viruses lack? A. The manufacture and use of complex carbon containing molecules B. The potential to grow and expand their populations C. Engages in self-sustaining biological processes such as homeostasis and metabolism D. The potential to pass hereditary material to offspringarrow_forwardViruses consist of either DNA or RNA wrapped inside a protein coat. Are viruses considered alive? A. Yes, because they contain DNA. B. Yes, because they contain DNA and proteins. C. No, because they lack carbohydrates and lipids. D. No, because some viruses use RNA as the main genetic molecule.arrow_forwardWhich of the following happens to the viral nucleic acid during a lysogenic cycle cycle? a-the viral DNA immediately takes over the host cell genetic material b-it bursts the host cell c-the viral DNA forms a provirus d-the viral DNA is used to attach the bacteriophage to the host cell`s receptorsarrow_forward
- Which of the following statements seemingly refute the fact that viruses are nonliving? A.They reproduce themselves only inside a host cell. B. They contain no enzymes. C. They can change over time, with the emergence of new strains. D. They cause diseases similar to those caused by bacteria. E. They are composed of protein and nucleic acid.arrow_forwardTo infect their specific host cells, viruses go through these chronological steps EXCEPT a. Release of progeny viruses b. Absorption and penetration of the viral particles c. Uncoating of the nucleic acid of the viral particles d. Synthesis and assembly of viral particle componentsarrow_forwardIs a Virus considered living or non-living? Justify your answer and Give one example of a virus.arrow_forward
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