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.

891

what is familiar hypercholesterolemia?

1205

The nucleophile in the first stage of the serine protease mechanism is a) H2O b) the carboxyl of Asp 102 c) the hydroxyl of Ser 195 d) the imidazole of His 57

940

Why are right-handed helices more stable than left-handed helices?

1148

Why does the pH of the blood decrease in a person who has digested trematol?

1050

which fat soluble vitamin has co-enzymic function?

766

Which vitamins participate, in coenzyme form, in reactions of the tricarboxylic acid cycle?

905

How do peptides react with cyanogen bromide?

782

does glucagon secretion induce sleep in teenagers?why?

997

What factors can change the pKa value of an amino acid residue, and in which direction?

1300

How are coupled reactions used in biochemistry?

1107

what is your passion?

829

What are the drawbacks of tissue slices technique?

999

What are hydrophobicity scales, and how are they used?

730

What type of column is generally used to separate amino acids from each other?

950