Defining exactly what section of a DNA sequence comprises a gene is difficult. Regulatory regions of a gene such as enhancers do not necessarily have to be close to the coding sequence on the linear molecule because the intervening DNA can be looped out to bring the gene and its regulatory region into proximity. Similarly, a gene's introns can be much larger than its exons. Regulatory regions can even be on entirely different chromosomes and operate in trans to allow regulatory regions on one chromosome to come in contact with target genes on another chromosome. COUNT 5
QSN1 What is an example of a regulatory region of a gene that does not have to close to the coding sequence? ANS1 enhancers QSN2 Why do some regulatory regions of a gene not have to be close to the coding sequence? ANS2 because the intervening DNA can be looped out to bring the gene and its regulatory region into proximity QSN3 What part of a gene can be much larger than its exons? ANS3 a gene's introns QSN4 How do regulatory regions on different chromosomes operate in order to allow regions on different chromosomes to come into contact with one another? ANS4 in trans QSN5 Where can regulatory regions be found? ANS5 different chromosomes