Assume that you have cut ? DNA with the restriction enzyme HindIII. You separate the fragments on an agarose gel and stain the DNA with ethidium bromide
You notice that the intensity of the stain is less in the bands that have migrated closer to the "+" pole. Give an explanation for this finding.
Because the smaller fragments migrate toward the "+" pole, away from the origin, they bind less stain than the larger fragments near the origin.
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What part of the E. coli T4 phage attaches to the host cell receptors?
A. Capsid fragments around the nucleic acid B. Protein fibers at the end of the phage tail C. Pili of the envelope D. Spikes of the envelope
Acid rains have the same effect as
a. use of manufactured fertilizers b. ion exchange. c. denitrification. d. leaching. e. weathering.
There are individuals who are missing one of their sex chromosomes and are designated as XO individuals. These individuals
A. develop as males. B. develop as females. C. are unusually tall. D. are easily recognizable.
Which bacterial structure may survive if temperatures applied during food preservation processes are too low?
A. Flagella B. Endospores C. Ribosomes D. Plasma membranes