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Isotopes that are unstable and decay when their nucleus breaks up into elements with lower atomic numbers, emitting significant amounts of energy in the process, are called __________.

Which of the following are pyrimidines? (You may select more than one)

The functional group below is hydrophobic.

A polymer with the sequence 5′ ACGTACGAATAG 3′ is a __________.

A double-stranded DNA strand contains 26 pyrimidines. How many purines will the copied strand contain?

The nitrogenous base that is only found in DNA is and not in RNA is __________.

You walk down into your basement to find that the carpeting on the floor is damp. Concerned, you look around for large puddles of water or broken pipes, but find none. In fact, only the basement floor and carpeting is damp. You realize that water must have wicked into the carpet from the floor by __________.

Bicarbonate ions in the blood can absorb hydrogen ions, keeping the pH balanced. Therefore bicarbonate is acting as a __________ in the blood.

Egg whites consist primarily of water and the protein albumin. When you fry an egg, why does the egg white turn from clear to white?

The same basic array of bones is modified to give rise to the wing of a bat and the fin of a dolphin. Such anatomical structures are called __________.