The phenotypic consequences of a deletion depend on which genes are located in the deleted region. If the deletion includes the centromere,

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#Question id: 15656

#Unit 13. Methods in Biology

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. Explain the two regulatory pathways for Mel1 that can explain the behavior of the MelA– and MelB– mutations. For each regulatory pathways what is a role for the inducer melibiose?

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#Question id: 1287

#Unit 4. Cell Communication and Cell Signaling

Biological roles of proteoglycans and hyaluronan include all of the following, except:

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#Question id: 28728

#Unit 2. Cellular Organization

Which one of the sorting signal, binds to a complex of the COPI α and β subunits?

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#Question id: 509

#Unit 1. Molecules and their Interaction Relevant to Biology

Glyceraldehyde 3-phosphate dehydrogenase causes

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#Question id: 2232

#Unit 2. Cellular Organization

A GPI anchor

a. serves to attach some proteins to the cytosolic face of the plasma membrane.

b. contains phosphotidylserine.                      

c. may be cleaved to release the protein from the membrane.

d. contains sugar residues in addition to lipid components.

e. contains phosphoethanolamine.