Biology - Study Guide
8th Edition
ISBN: 9780321501561
Author: Martha R. Taylor
Publisher: PEARSON EDUCATION (COLLEGE)
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Chapter 19, Problem 10TYK
Summary Introduction
Introduction: Pathogens are the microorganisms that cause infection. Bacteria,
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Which of these is true of prions?a. They are small RNA viruses.b. They replicate in the nucleus.c. They lack protein.d. They cause death of brain cells.
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
According to the progressive, or escape, hypothesis, viruses (a) appeared before the three domains diverged (b) came from mobile genetic elements and had multiple origins (c) evolved from early plant cells (d) are bits of nucleic acid that escaped from animal cells (e) evolved from cells thatwere parasites in larger cells
Chapter 19 Solutions
Biology - Study Guide
Ch. 19 - In the following diagram of lytic and lysogenic...Ch. 19 - Summarize the flow of genetic information during...Ch. 19 - How does a virus spread throughout a plant? Are...Ch. 19 - Create a concept map that describes the lytic and...Ch. 19 - Prob. 2SYKCh. 19 - Prob. 1TYKCh. 19 - Prob. 2TYKCh. 19 - Prob. 3TYKCh. 19 - Prob. 4TYKCh. 19 - T2 and T4 are two types of bacteriophage that...
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- Why don’t scientists usually consider viruses living? A.They do not have DNA B.They do not have cells C.They cannot reproducearrow_forwardDo you think that this occurrence of medical breakthroughs that resulted to drug-resistant viruses might be prevented? If so, how?arrow_forwardWhat are prions? A. misfolded versions of normal proteins that can cause disease B. mobile segments of DNA C. tiny circular molecules of RNA that can infect plants D. viral proteins that attach to the genome of a host and cause diseasearrow_forward
- An experimental drug therapy to treat patients with antibiotic-resistant bacteria involves introduction of a highly specific bacteriophage to the infected patient's bloodstream. Which of the following bacteriophage types would be the LEAST useful for this therapy? a. a lytic bacteriophage b. An enveloped virus c. An RNA virus d. a lysogenic bacteriophagearrow_forwardWhich 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 antibioticsarrow_forwardWhy is the Nipah virus a great illustration of a zoonotic disease? A. Because it's carried by fruit bats across America but it's not even noticed by the American people. B. Because it's carried by cats across Asia and easily spills over into humans. C. Because it's carried by fruit bats across Asia but almost never spills over into humans. D. Because it's carried by fruit bats across Asia and easily spills over into humans.arrow_forward
- Can viruses evolve? A. No, because viruses are not living organisms B. No, because viruses don't have DNA C. Yes, anything with a genetic basis and ability to reproduce can evolve D. yes, but only by mutations to their RNA.arrow_forwardIn 2006, the US Food and Drug Administration (FDA) approved the use of bacteriophage preparation that can be used on ready-to-eat meat and poultry products to kill Listeria monocytogenes, a bacterium that causes listeriosis. Some people may have concerns about the use of phages in foods. From what you have learned about bacteriophages and viruses, why do you think we do not have to be concerned about the presence of bacteriophages in food?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
- According to your own understanding, what do you think makes viruses some of the most common disease causing organisms? Explain comprehensivelyarrow_forwardWhich 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_forwardHIV is a retrovirus what does this mean? A. That is a DNA virus and it must make RNA before it can make proteins. B. That it is an RNA virus and must convert its genetic material to DNA once it enters a cell. C. That is was a virus discovered in the recent past D. That is an RNA virus and goes directly to ribosomes of host cells to reproduce Please explain your answer!arrow_forward
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