Severe acute respiratory syndrome (SARS) has what characteristic structures when visualized under an electron microscope?
a. Glycoprotein spikes
b. Crownlike surface projections
c. Filamentous structures
d. Shepherd's hook
B
Coronaviruses such as SARS are pleomorphic, roughly spherical, medium-sized, and enveloped ribonucleic acid (RNA) viruses. The prefix corona- is the result of the viral structure and the crownlike surface projections on the external surface of the virus when visualized using electron microscopy.
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The scientific name for coffee is Coffea arabica. More specifically, the species name is arabica
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Serratia marcescens bacteria has a gene that regulates red pigment production by cells. A student inoculates two nutrient agar plates of Serratia and incubates one at 25oC and the other at 37oC. Following incubation, the student observes that colonies on the 25oC plate are red while those on the 37oC plate are nonpigmented. Which of the following statements is a logical conclusion based on these results?
A. Serratia cells undergo a genotypic change that is proportional to changes in temperature. B. Serratia genes for pigment production are induced at certain temperatures. C. Low temperatures cause repression of certain housekeeping genes. D. This is an example of constitutive gene expression.
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