Clusters of nerve cell bodies that function as a local
integrating center are
a. nerve cords.
b. ganglia.
c. a plexus.
d. notochords.
e. nerves.
Answer: b
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A bacterial artificial chromosome (BAC) is different from a plasmid vector because it:
A. lacks an origin for replication in bacteria. B. accommodates much larger fragments (100–300kb). C. has a higher copy number than the plasmid vector. D. has only selectable markers with which to detect its presence in cells. E. lacks par genes that the plasmid has to maintain its high copy number.
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.
Salt and water balance
What will be an ideal response?
List and discuss five factors responsible for the emergence of new pathogens or the reemergence of existing pathogens
What will be an ideal response?