If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that radioisotope has decayed is years old

Imagine that twenty i.u.’s of enzyme z were catalyzing the above reaction for one minute, under vmaxconditions, in a 3.00 ml assay volume. the assay is buffered with 20 mm phosphate buffer, ph 7.60. what will the ph be at the end of that one minute?

What does the symbol (–hfus) indicate in a phase change?

Which substance is a steroid? cholesterol fatty acid monosaccharide trans fat