MCAT Biochemistry 7.5 (High Yield) questions and 100% correct answers 2025

MCAT Biochemistry 7.5 (High Yield)
questions and 100% correct answers
2025
transcription factors - ANSWER -transcription-activating proteins that search the DN for specific DNA-
binding motifs (promoter and enhancer regions)




have DNA binding domain and an activation domain




DNA binding domain - ANSWER binds to a specific nucleotide sequence in the promoter region or to a
DNA response element to help in the recruitment of transcriptional machinery




activation domain - ANSWER Allows for the binding of several transcription factors and other important
regulatory proteins which function in remodeling of chromatin structure




Enhancers - ANSWER response elements outside the normal promoter region recognized by
transcription factors to raise transcription levels




gene duplication - ANSWER increase gene expression by duplicating genes in succession or in parallel




histone acetylation - ANSWER acetylation decrease positive charges on lysine residues and weaken
interactions of histone w/DNA allowing easier access for transcriptional machinery