Determining the functional nature of a microbial community by analysis of bulk DNA samples extracted from environmental samples may be misleading for all of the following reasons EXCEPT ________.
A. the DNA obtained can depend on the extraction method used
B. some of the DNA may be from entities such as spores
C. DNA is of little use in identifying unknown microbes
D. some of the DNA recovered may be from nonliving organisms
Answer: C
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In adult arthropods, the hemocoel _____
A) provides space for the internal organs to grow and function B) forms a cavity to protect the visceral mass of organs C) acts as a hydrostatic skeleton for mobility D) secretes the exoskeleton
Hormone A binds to intracellular receptors in its target tissue. As a result of Hormone A, the target
tissue is now sensitive or responsive to Hormone B. The action of Hormone A was to
a. decrease mRNA for Hormone A receptors. b. increase receptor sites for Hormone B. c. increase receptor sits for Hormone A. d. increased cyclic AMP levels which activated receptors for hormone B. e. decrease receptor sites for Hormone B.
What is meant by the "beads on a string" model of chromatin?
A) The beads are the histones, and the string is the transcriptionally active DNA loops. B) The beads are the nucleosomes, and the string is the linker DNA. C) The beads are molecules of DNA polymerase that attach to the DNA string. D) The beads are ribosomes, and the string is the mRNA that has been transcribed from active chromatin. E) The beads are the heterochromatic regions that are tightly compacted, and the strings are euchromatic regions that are being actively transcribed.
Which test cannot be used for identification of a person's HIV status?
A. ELISA B. Immunochromatographic testing C. Western Blot D. Biochemical tests