Add the correct form of be or have. a small protein molecule a molecular weight of about 10.000. light a speed of 186.000 miles per second. there several kinds of vitamins. 500 pounds the maximum weight that this rope can support. laboratory equipment usually made of pyrex glass. good stereo systems a frequency range of 30 to 18000 cycles per second. gold coins usually a composition of 90% gold an 10% copper. genetics the study of the variation in heredity. although similar in hemoglobin, chrolophyll magnesium rather iron as the central atom. fractional distillations methods of separating portions different volatility from a liquid.