If you were to use antibodies that were chemically bonded to a stain in order to visualize the expression pattern of a protein in a fixed tissue, what experimental techniques and equipment would be applicable?
A. antibody interference assay, bright-field microscopy
B. immunohistochemistry, dark-field microscopy
C. immunohistochemistry, bright-field microscopy
D. DAPI or Hoechst stains, fluorescence microscopy
C. immunohistochemistry, bright-field microscopy
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Most of today's animal phyla appear in the fossil record within a short span of 25 million years beginning about 530 MYA. When researchers analyzed the DNA evidence that might relate sponges to the modern phyla, what unexpected result did they find?
A. Many development genes thought to be specific to eumetazoans were found in sponges. B. The entire genome of sponges was found to be very different in gene diversity from the genomes of other phyla. C. Samples of the living sponge Oscarella carmela were found to be relatively unchanged from fossil sponge DNA samples. D. Most of the developmental genes found in eumetazoans are absent in the sponge Oscarella carmela. E. All of the answer choices are correct.
Birds and mammals share which of the
following characteristics?
a. ectothermy b. air pocketed bones c. bladders d. four-chambered heart e. more than one of these
When your blood pressure is measured from an artery in your arm, it is a measurement of the pressure produced by your
A) right ventricle. B) right atrium. C) left ventricle. D) left atrium.
In a mating between individuals with the genotypes IAi × ii, what percentage of the offspring are expected to have the O blood type?
A) 75% B) 50% C) 0% D) 100% E) 25%