DNA binding by proteins with the helix-turn-helix (HTH) motif does not involve a) altered stacking of the DNA at the center of symmetry. b) hydrogen bonds, salt bridges, and van der Waals contacts. c) interactions with base pairs in the major groove of DNA. d) interactions with the sugar-phosphate backbone of DNA.
When it functions as a "second messenger", cAMP a) acts outside the cell to influence cellular processes. b) acts "second in importance" to AMP. c) activates all cytosolic protein kinases. d) activates the cAMP-dependent protein kinase.
which fat soluble vitamin has co-enzymic function?
What is the structural formula of molybdenum blue?
What factors are involved in determining the electrophoretic mobility of a molecule?
How are free energy changes related to LeChatelier's Principle?
Describe the structure of a peptide giving the sequence.
How do peptides react with cyanogen bromide?
How do hydrophobic and hydrophilic residues arrange themselves in globular proteins?
How is the actual free energy change for a process related to the standard free energy change?
What factors can change the pKa value of an amino acid residue, and in which direction?
How does hplc differ from normal column chromatography, and what are its advantages?
How are free energy changes related to enthalpy changes and entropy changes?
Why are right-handed helices more stable than left-handed helices?
How are reaction rates dependent upon free energy changes?
