The NtrC protein from E. coli

a. is a σ54 RNA polymerase.             

b. stimulates transcription of the glnA gene.

c. is activated by a protein kinase called NtrB.

d. binds both to an enhancer site upstream of the glnA gene and to RNA polymerase.

e. has ATPase activity.

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#Question id: 5626

#Unit 5. Developmental Biology

The main function of fimbriae of oviduct are ________

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#Question id: 2531

#Unit 2. Cellular Organization

The specific linkages between sugar rings, including the specific carbons that are linked together and the configuration of the linkage, are important for the properties of the polysaccharide;

 I) Amylose                             a)β(1,3)-linkages                                  

 II) Cellulose                            b) β (1,4)-linkages

  III) Callose                             c) α(1,4)-linked

                                                 d) α (1,3)-linkages

Which of the following linkage combination is correct linkages of the polysaccharides?

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#Question id: 949

#Unit 1. Molecules and their Interaction Relevant to Biology

Nitric oxide is produced from which reaction?

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#Question id: 23114

#Unit 2. Cellular Organization

What is the minimum length to stabilize nucleosome 

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#Question id: 31150

#Unit 2. Cellular Organization

The most common CFTR mutation is a deletion of a phenylalanine at position 508 in the protein sequence. This mutation prevents: