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.

TLS Online TPP Program

#Question id: 34116

#Unit 2. Cellular Organization

A. The positive charge on lysine is neutralized upon acetylation

B. Methylated lysine and arginine are neutral.

C. Lysine can be mono-, di-, or triacetylated

D. Arginine can be mono or diacetylated. 

E. Both Lysine and Arg can be acetylated

Choose true and false

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#Question id: 4671

#Unit 3. Fundamental Processes

CpG island promoters are methylated at position 5 of the pyrimidine ring. CG sequences are thought to be underrepresented in mammalian genomes because

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#Question id: 484

#Unit 1. Molecules and their Interaction Relevant to Biology

Galactosemia is a genetic error of metabolism associated with:

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#Question id: 5221

#Unit 11. Evolution and Behavior

Unequal crossing over during Prophase I can result in one sister chromosome with a deletion and another with a duplication. A mutated form of hemoglobin, known as hemoglobin Lepore, is known in the human population. Hemoglobin Lepore has a deleted set of amino acids. If it was caused by unequal crossing over, what would be an expected consequence?

TLS Online TPP Program

#Question id: 945

#Unit 1. Molecules and their Interaction Relevant to Biology

A key precursor in the synthesis of aromatic amino acids (tryptophan, tyrosine and phenylalanine) is ________.