Dolphins (which are mammals) and sharks (which are fish) have stiff dorsal fins projecting from their backs that help them maneuver through water. What are these structures BEST described as?
A) analogous structures.
(B) homologous structures.
(C) vestigial structures.
(D) mutations.
Ans: A) analogous structures.
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The reason to use lacZ in the creation of a fusion gene for studying gene expression is:
A. the lacZ gene product binds to the activator domain increasing gene expression. B. the lacZ gene product is easily measured. C. the lacZ gene product interferes with the DNA binding domains of repressor proteins. D. the lacZ gene product will form a leucine zipper with the other domain of the fusion gene product.
Magnifications in excess of 100,000 times are achieved by ________ microscopy?
a. bright-field b. electron c. dark-field d. phase-contrast
Molluscum contagiosum is transmitted by direct contact with skin lesions, fomites, and sexual activity.
Answer the following statement true (T) or false (F)
The laboratory technique used to separate the DNA fragments produced by automated DNA sequencing is:
A. the polymerase chain reaction B. gel electrophoresis C. ultracentrifugation D. electron microscopy E. fluorescence microscopy