You are studying a new strain of E. coli that can utilize the disaccharide melibiose very efficiently. You find that utilization depends on the enzyme melibiase, which is encoded by the gene Mel1. Mel1 is not expressed unless melibiose is present in the growth medium. Next you isolate a mutation, designated MelB–, which gives uninducible melibiase activity. Mapping experiments show that MelB– is linked to Mel1. Using an F' factor that carries the chromosomal region surrounding Mel1, you perform the following genetic tests:

                      

Describe the basic genetic properties of the MelB– mutation?

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#Question id: 11990

#SCPH28 | Zoology

Imagine that you are designing an experiment aimed at determining whether the initiation of migratory behavior is largely under genetic control. Of the following options, the best way to proceed is to

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#Question id: 12021

#SCPH28 | Zoology

Nutrient-rich blood from the intestine is carried through the ________ to the liver.

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#Question id: 12022

#SCPH28 | Zoology

The bile salts ________.

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#Question id: 12023

#SCPH28 | Zoology

The absorption of fats differs from that of carbohydrates in that ________.

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#Question id: 12024

#SCPH28 | Zoology

Constipation can result from the consumption of a substance that ________.

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#Question id: 12025

#SCPH28 | Zoology

After surgical removal of an infected gallbladder, a person must be especially careful to restrict dietary intake of ________.