Why must cells constantly reproduce?

The figure above shows results from a pulse chase experiment immediately after the chase

A famous experiment, Matthew Meselson and Franklin Stahl grew E. coli cells in a medium containing only the "heavy" isotope or nitrogen, ^15N. These cells were then transferred to a medium with the "light" isotope of nitrogen, ^14N.

A mother and father have a child that is homozygous recessive. The mother knows that she is heterozygous for type A blood. What must the father be in order for it to be his child?

Which of these layers is typically thinnest? A. A horizon B. B horizon C. O horizon D. C horizon

How can Celera make a profit off of sequencing our DNA?

Does glucose follow the same path as blood in the kidneys

Explain how to predict y-values using the equation of a regression line.

What non-renewable resource, when burned, is the leading cause of increased levels of carbon dioxide in the atmosphere?

Whenever you mix an acid with a base, they neutralize each other. If this is The case, Why is Alka-seltzer used to treat stomach aches?

Which of these formulas contain equal numbers of nitrogen atoms?