The diagram shows how chromatin may open up for transcription by the addition of acetyl groups (-CO–CH3). It also shows how chromatin may become tightly wound, preventing transcription, by the addition of methyl groups (—CH3). The diagram provides a useful model to illustrate which of these statements about gene expression?

Answer is C

Photosynthesis converts solar energy into what type of energy?

Acar company is testing seatbelts using crash test dummies. the company finds that when cars come to a sudden stop, the crash test dummies' bodies continue to move forward. the seat belt keeps the crash test dummies from hitting the back of the seat in front of them. why do the crash test dummies' bodies continue to move forward even though the car stopped? a. the friction opposing their bodies' movement keeps them in motion. b. the inertia of their bodies keeps them in motion. c. the forward acceleration of the car keeps them in motion. d. the gravity pulling on the car keeps them in motion.

How does deforestation affect the water cycle? a. it increases the amount of runoff b. it increases the amount of percolation c. it increases the amount of transpiration d. it increases the amount of precipitationa it increases the amount of runoff