This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
Leucine zipper complex is 
Select and explain. 
A. B cell epitomes, B. Receptor ligand protein, C. DNA binding protein, D. Membrane attack complex
C: DNA binding protein
Answer: C: DNA binding protein 
Explanation: Proteins that bind to DNA contain a limited number of motifs.The helix-loop-helix motif is an example found in a number of proteins that function in a number of proteins that function as transcription factors Example: zinc fingers, and leucine zippers . REF :LIPPINCOTT'S TEXTBOOK OF BICHEMISTRY ;8th EDITION ;Page no :18 AND 422.