Cholesterol plaques in aging arteries and veins will lead to
a. beta amyloid deposits.
b. changes in the electrolyte balance.
c. elevated blood pressure.
d. neurofibrillary tangles.
e. a smaller heart.
C
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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. This is an example of constitutive gene expression. B. Serratia cells undergo a genotypic change that is proportional to changes in temperature. C. Low temperatures cause repression of certain housekeeping genes. D. Serratia genes for pigment production are induced at certain temperatures.
Photoreceptors are sensitive to what general type of sensory information?
A. tactile B. sound C. temperature D. chemicals in the animal's environment E. electromagnetic radiation
E. coli is a good model system for molecular biology studies because
a. it has a small genome. b. it reproduces rapidly. c. mutants can easily be isolated from culture dishes. d. All of the above
You are doing research on a bacterial species, trying to determine the shape, distribution, and arrangement of a number of filamentous structures that protrude from the cell surface. Which type of microscopy would best enable you to do this?
A. bright-field microscopy B. scanning electron microscopy C. dark-field microscopy D. transmission electron microscopy