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.