You have been given a sample of Mimivirus, which has the largest capsid diameter of all currently known viruses (600 nm) and has the form of a 20-sided polyhedron (an icosahedron)
Based on your knowledge of microscopes, what would you be able to see/determine about mimiviral structure using each of the following microscopes?
a. simple compound (light) microscope
b. fluorescent microscope using fluorescently labeled antibodies to a novel capsid protein
c. scanning electron microscope
What will be an ideal response?
Answer:
a. Light microscope: will be able to see basic viral shape, especially if particles are stained
b. Fluorescent microscope: should illuminate the outside of the viral particles
c. Scanning electron microscope: would allow imaging of the surface structure of the virus
You might also like to view...
The theory that modifications in an individual caused by the use or disuse of a structure could be inherited by its offspring to bring about changes to the species, is also referred to as which of the following?
a. descent with modification b. natural selection c. inheritance of acquired characteristics d. natural transformation
Which of the following countries is not a member of the European Union?
a. Switzerland b. Portugal c. Sweden d. Ireland
Step 2 in Figure 41-3 is accomplished by:
a. an influx of Ca2+.
b. an influx of Na2+.
c. an influx of K+.
d. an efflux of Na2+.
e. an efflux of K+.
Researchers applied radioactive phosphorus and radioactive calcium to a freshly cut tree stump. Eight days later, they came back to measure the distribution of the radioisotopes. They found that nineteen different species of shrubs and trees within a seven-meter radius had taken up the radioactive elements. No radioactivity was detected in the air. Radioactive isotopes were never detected in any samples containing just soil taken during the experiment. The finding implies that the
a. soil does not provide the ecosystem with minerals b. isotopes were undetectable in very small amounts c. isotopes were transported via vascular tissues d. plants quickly return minerals to the soil in which they grow e. soil speeds up radioactive decay