The technique known as ________ relies on the fact that although the PCR fragments are about the same ________, they differ in ________. The DNA denaturing rate on a gel then varies with the ________ content, DNA sequence, and chemical gradient. Hence, similar fragments can be separated and identified.
What will be an ideal response?
denaturing gradient gel electrophoresis (DGGE), size, nucleotide sequence, G + C
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The __________ consists of skull bones, a vertebral column (backbone), and a rib cage. Fill in the blank(s) with the appropriate word(s)
The relationship between nectar-producing flowers and nectar-feeding birds is a mutually beneficial interaction
Indicate whether the statement is true or false
Eukaryotic chromosomes contain two general domains that relate to the degree of condensation. These two regions are ________
A) void of introns B) called heterochromatin and euchromatin C) separated by large stretches of repetitive DNA D) each void of typical protein-coding sequences of DNA E) uniform in the genetic information they contain
In the countercurrent exchange system of fish gills,
A) blood and water flow in the same direction. B) blood and water flow in opposite directions. C) blood and water are separated by a thick polysaccharide barrier. D) blood flow in the gills reverses direction with every heartbeat.