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A chemical component that is found in all viruses is:
(a) Protein (d) RNA
(b) Lipid (e) Glycoprotein
(c) DNA
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- What is life? Why are viruses not considered alive? What other things can you think of that are not alive but might be almost alive?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 antibioticsCan 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.
- Why don’t scientists usually consider viruses living? A.They do not have DNA B.They do not have cells C.They cannot reproduceWhy is it a strong evolutionary hypothesis that although viruses are the structurally simplest beings they were not the first living beings?Viruses are composed of which type of genetic material inside of a protein shell? a. Not all viruses contain genetic material b. RNA c. DNA d. DNA or RNA
- What 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 diseaseWhy are viruses are not regarded as true living cells?A plasmid (a) can be used as a DNA vector (b) is a type of bacteriophage (c) is a type of cDNA (d) is a retrovirus (e) b and c
- Upon learning the distinguishing characteristics of living organisms, would you consider viruses to be exhibiting the features of living organisms? Why or why not? Explain what other principles support the characteristics of life.Which 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 receptorsDifferent types of viruses have different types of genomes- some are double-stranded DNA, some are single-stranded DNA, some are double-stranded RNA, and some are single-stranded RNA. The Ebola virus genome is a piece of single-stranded RNA. Given this piece of information, do you expect it to see %Adenine = %Uracil and the %Guanine = %Cytosine? Why or why not?