_____ signals only operate over very short distances
a. Chemical
b. Tactile
c. Electrical
d. Visual
e. Acoustical
B
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Although an exact count is not available, it is likely that the human brain has as many as _____
A) 10,000 neurons B) 500,000 neurons C) 1 million neurons D) 10 million neurons E) 100 billion neurons
Gene expression profiles differ from classic gene maps in that
A) gene expression profiles depict the relative locations of genes on chromosomes, and classic gene maps show the increase and decrease of transcription with time or in different tissues. B) gene expression profiles depict the increase and decrease of transcription with time or in different tissues, and classic gene maps show the relative locations of genes on chromosomes. C) gene expression profiles measure DNA, and classic gene maps size-order the chromosomes. D) gene expression profiles sequence genomes, whereas classic gene maps do not actually sequence the DNA.
The fact that salt dissolves in water is best explained by the
A) slightly charged nature of water molecules. B) ionic nature of water molecules. C) hydrophobic nature of the water. D) hydrophobic nature of salt. E) polar nature of water molecules.
Choose the letter of the best match from the following:A. hotspotB. habitat lossC. edge effectsD. megafaunal extinctionE. extinction vortexA species goes extinct without any clear, single cause.
Fill in the blank(s) with the appropriate word(s).