The basic building block of DNA is called a NUCLEOTIDE. A nucleotide is made up of one sugar molecule, one phosphate molecule and one of the four bases. Here is the structural formula for the four nucleotides of DNA. Note that the purine bases (adenine and guanine) have a double ring structure while the pyrimidine bases (thymine and cytosine) have only a single ring.
Medium. To prepare a medium steak on the grill, cook to an internal temperature of 160 degrees Fahrenheit. When you press the steak, it should feel slightly firm with a pink center and a grayish burn on the outside. As a general rule, cook a 1-inch steak to medium by leaving it on the grill for 2 to 3 minutes per side.ell Done. A well-done steak needs an internal temperature of 170 degrees Fahrenheit. To reach this internal temperature, you need to leave the steak on the grill for 4 to 5 minutes per side for a 1-inch steak or 8 to 9 minutes for a steak measuring 1 3/4 inches.
1 Prepare barbecue (high heat). If using gas grill, leave opposite side unlit; if using charcoal grill, keep opposite side free of coals. Brush steaks with olive oil, then sprinkle both sides with cracked black pepper and smoked salt.  Grill steaks on hot side of barbecue until grill marks form, about 3 minutes per side. Transfer steaks to unlit side of grill, cover, and cook to desired doneness, about 8 minutes for medium-rare. Transfer steaks to plates; let rest 10 to 15 minutes.