Each group contained 25 cattails. All of the groups were grown in the same type of soil, they all received the same amount of light, and they were all kept at the same
Cooking at a constant oven temperature of 300Â°F (160Â°C), a 5- to 8-lb standing rib roast will take 17-19 minutes per pound for rare, 20-22 for medium rare, 23-25 minutes for medium, and 27-30 minutes for well done.ow long and at what temperature should I cook a beef roast in the oven? Roasting is a great cooking method for a large, tender cut of beef  such as a rib or sirloin roast.
The Picture Pantry/Lisovskaya Natalia/Getty Images. The proper temperature to cook a medium-rare steak is 130 F - 135 F. However, according to foodsafety.gov, beef, lamb, and pork should be cooked to at least 145Â° (or above, if desired). Ground meat must be cooked to at least 160 F. Ground poultry must be cooked to at least 165 F. Fully cooked hams should be heated to at least 140 F.