Which of the following is true of enhancer sequences?
A) They can act over very large distances.
B) They can only act in one specific orientation.
C) They are usually between 10 and 35 bp long.
D) They can only function if located upstream of a gene.
E) They can only function if located downstream of a gene.

Question

Quizplus · Accepted Answer

Enhancer sequences are regulatory DNA sequences that can act over very large distances, sometimes even affecting genes located on different chromosomes.

Answer: B and C are incorrect
 Enhancer sequences are orientation independent and can be of varying lengths, ranging from a few base pairs to several kilobases.

Answer: D and E are incorrect
 Enhancer sequences can function both upstream and downstream of a gene.

Which of the Following Is True of Enhancer Sequences