DNA structure. DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C).The order of these bases is what determines DNA's instructions, or genetic code.NA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C). The order of these bases is what determines DNA's instructions, or genetic code.
A beef roast cooked to medium-rare should have an internal temperature of 145Â°F - 150ÂºF after the resting period, and a roast cooked to medium should have an internal temperature of 150Â°F to 160ÂºF. (See the note below). See Beef Doneness for more information on proper cooking temperatures. Cook the roast for about 10 to 15 minutes and then turn it over in the pan. 2  Continue to cook it for another 10 to 15 minutes for every pound. 3  Remove the tenderloin from the oven when the internal temperature of the meat reaches 140Â°F, as indicated on a meat thermometer inserted into the center of the roast.
â¢ For food safety reasons, DO NOT thaw beef roasts on countertops or at room temperature. â¢ Cook immediately after thawing; beef roasts should be cooked to an internal temperature of 145 to 160 degrees F using a food thermometer.You canât tell if food is cooked safely by how it looks. Roasted or braised beef roasts for about 45 minutes per pound at 325 degrees F. A 2-pound roast will take about 1 Â½ hours to cook. â¢ Slice cooked beef roasts and serve with gravy; steamed vegetables; and rice, noodles, or potatoes.