A particular virus consists of only DNA and proteins. Viruses attach to the surface of a host cell and inject the viral DNA into the host. The host cell then copies the viral DNA and makes new viruses. Eventually, the host cell is killed, and the new
viruses are released. These new viruses search for new hosts to continue the cycle. Identify and apply at least three characteristics of life to justify whether a virus is a living thing.
What will be an ideal response?
Whether a virus is a living thing is debatable. Students may argue that a virus is not alive because it does not reproduce on its own, it is not made of cells, etc. However, a student may argue in the other direction based on his or her interpretation of the characteristics of life. For example, the student might answer that viruses do reproduce by coercing their host cells into copying their contents.
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The gritty feel of a pear is due to ____ cells
a. collenchyma b. epidermal c. fiber d. sclereid e. parenchyma
Which event may occur in all viruses,
prokaryotes, and eukaryotes? a. duplication b. aneuploidy c. translocation d. mutation e. none of these
One characteristic of animal development is the specialization in both structure and function that cells undergo. This is called
A) direct development. B) placental development. C) differentiation. D) indirect development. E) internal development.
An abnormally short frenulum of the tongue produces which of the following conditions?
A. Ankyloglossia B. Bifid Tongue C. Macroglossia D. Microglossia E. Frenulitis