How can microarrays help us understand cellular functions?
a. Microarrays let us study different cells under different conditions.
b. Microarrays let us directly measure protein expression in individual cells.
c. Microarrays, by hybridizing cDNAs to DNA sequences already present on a chip, let us
identify which portions of a genome were being expressed in a cell at a particular time.
d. Microarrays let us identify which DNA sequences are present in a particular cell type
under certain conditions.
e. Microarrays, by hybridizing DNA to cDNA sequences already present on a chip, let us
identify which portions of a genome were being expressed in a cell at a particular time.
C
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Which statement best describes the purpose of DNA profiling?
DNA profiling amplifies a specific sequence of DNA. DNA profiling is done to detect specific sequences of DNA. DNA profiling is done to determine the sequence of nitrogenous bases in DNA. DNA profiling is done to demonstrate patterns of DNA fragments in a gel that are unique to an individual organism.
A northern blot differs from a Southern blot in the
A) type of probe used. B) presence or absence of a nitrocellulose membrane. C) size of the genetic sequences involved. D) number of genetic sequences detected. E) type of nucleic acid being isolated.
The Pax6 gene is considered a master gene because
A. it was the first gene developed that resulted in a protein for sight. B. it controls the development of all the homologues that have to do with light refraction in the eye. C. the primitive eye developed into the complex eye. D. the gene encodes for development of ommitidia which combine to make the simple eye. E. the protein encoded by the Pax6 gene is a transcription factor that controls the expression of many other genes needed for eye development.
In what way do birds differ from mammals?
a. They lack clavicles and pectoral muscles. b. They have 12 pairs of cranial nerves. c. They have unidirectional airflow through the lungs. d. They have a closed circulatory system.