Fluorescence in situ hybridization is another way to visualize the presence of a nucleotide sequence. Which of the following is an advantage of FISH over Northern and Southern blots?
A) Probes are not needed in FISH.
B) Fluorophores are not used in Northern or Southern blots.
C) There are no advantages to FISH over Northern and Southern blots.
D) Blotting is not used in FISH.
Answer: D
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The study of the occurrence, distribution, and determinants of health and disease in a population is the field of
A) microbiology. B) immunology. C) epidemiology. D) virology.
The descending portion of the loop of Henle is
A. permeable to water and impermeable to sodium. B. permeable to water and permeable to sodium. C. impermeable to water and permeable to sodium. D. impermeable to water and impermeable to sodium. E. the site of active transport of water.
The accumulation of free oxygen in the atmosphere ____
a. was a result of the accumulation of a byproduct of a type of photosynthesis b. caused the further spontaneous generation of life c. provided the opportunity to extract more energy through anaerobic respiration d. occurred immediately after the earth was formed e. allowed for DNA to replace RNA as the primary data storage molecule
In a certain bird species, clutch size (the number of
eggs laid by a female at one time) ranges from four to eight, and the most frequent clutch size is six. This phenomenon is an example of a. sexual selection. b. stabilizing selection. c. disruptive selection. d. directional selection. e. divergent selection.