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.
Place roast in pan and season, if desired. Cover pan tightly with foil. Preheat oven to 500 degrees. Cook roast beef as follows 4 minutes per pound for rare, 5 minutes per pound for medium, and 6 minutes per pound for well done.