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.
What will be an ideal response?
Since 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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The time between inoculation and the beginning of growth is usually called the
A) lag phase. B) log phase. C) dormant phase. D) death phase.
The ability of glucose to repress the lac operon depends on which effector molecules?
A. allolactose B. cAMP C. tryptophan D. ADP E. starch
On a phylogenetic tree, each node (branchpoint) represents a divergence event, and the length of the branches represents the number of molecular changes that have taken place between the nodes.
Answer the following statement true (T) or false (F)
There are many ways to prevent insomnia. Which is NOT recommended?
-stay active, regular activity helps promote a good night's sleep -check your medications to see if they contribute to insomnia -nap frequently to make up sleep debts -avoid or limit caffeine and alcohol, and don't use nicotine