16. Which of the following is not a model organism? a. Mus musculusCell b. Droso
ID: 33712 • Letter: 1
Question
16. Which of the following is not a model organism?
a. Mus musculusCell
b. Drosophila melanogaster
c. Homo sapiens
d. Arabidopsis thaliana
e. Caenorhabditis elegans
17. Why are viruses not considered to be organisms and not described as being alive? The answer is that viruses do NOT:
a. Reproduce by themselves.
b. Metabolize by themselves.
c. Assemble their component parts in the cell.
d. Synthesize RNA or DNA by themselves.
e. Use glucose as an energy source.
18. Potato spindle-tuber disease, which causes potatoes to become gnarled and cracked, is caused by an infectious agent consisting of a small circular RNA molecule that totally lacks a protein coat. These infectious agents are thought to exert their effects by interfering with the cell's normal path of gene expression. Such an infectious agent is known as a(n):
a. provirus
b. bacteriophage
c. prion d. viroid
e. girus
19. Why are Archaea restricted to habitats that we would consider harsh and extreme?
a. They are not restricted to extreme environments. Scientists have found them almost everywhere they have looked for them.
b. These habitats closely resemble the Earth before oxygen appeared in the atmosphere, and they are relatively anaerobic.
c. They are from outer space.
d. They are most recent forms of life on earth.
e. They do not have ribosomes.
20. Which does not define an embryonic stem (ES) cell?
a. They are a type of stem cell isolated from very young mammalian embryos.
b. They are the cells in the early embryo that give rise to all of the various structures of the mammalian fetus.
c. ES cells are pluripotent, which means that they are capable of differentiating into every type of cell in the body.
d. They have 18S RNA
e. They can be isolated from a variety of adult tissues
Explanation / Answer
16.c. Homo sapiens
17.d. Synthesize RNA or DNA by themselves.
18.a. provirus
19.b. These habitats closely resemble the Earth before oxygen appeared in the atmosphere, and they are relatively anaerobic.
20.c. ES cells are pluripotent, which means that they are capable of differentiating into every type of cell in the body.
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