Identify a) regulatory components of eukaryotic cells that may inhibit transcription at the chromatin level (via chromatin modification). (4 pts.) b. a specific behavior that is known to cause epigenetic changes that may be inherited by our children. (3 pts) c. one specific way CRISPR-Cas9 technology benefits humans. (3 pts.) d. tool (key technique) in DNA technology that allows us to distinguish one DNA fragment from another DNA fragment. (3 pts.)

a .RNA poymerase II

b. Fathers exposure to environmental factors

c. Develops new cancer treatment

d. Gel electrophoresis

Step-by-step explanation

a .The Chromatin structure imposes significant obstacles on all aspects of transcription which are mediated by RNA polymerase II. 

b .These factors such as diet, behavior, stress, exposure to pollutants, and physical activity  causes epigenetic changes which may be passed down from one generation to the other . Father's exposure to environmental factors play a role in an offspring's epigenetic patterns and health.

c. CRISPR has the ability to alter the course of human evolution and it will improve society for the greater good .

d.  In gel electrophoresis the scientists load the DNAs into special wells in a gel. Then with the help of electricity, they separate the DNAs by size.