A liver cell and a cheek cell have the same chromosomes. The only cells in the human body that do not contain 46 chromosomes are reproductive cells, which only contain 23 chromosomes, according to... Star Gazing
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 to an internal temperature of 170 degrees. Use a meat thermometer inserted into the thickest part of the roast. Roast it at 325 F. in a preheated oven for about 40 minutes. The time is about 25 minutes per pound. For your 1.5 pound roast that would be about 40 minutes.