High levels of blood glucose over long periods of time damage blood vessels and major organs. In healthy people, these levels are controlled by the pancreas.

In response to high blood glucose, the pancreas releases the hormone insulin. This instructs target cells in the liver and muscles to absorb glucose so that the amount circulating in the blood drops.

Would you expect the amount of insulin in your blood to be greater just before or just after eating breakfast? Why?

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.