The Four Nitrogenous Bases of DNA + Other Structural DNA Stuff

thymine

This nitrogeneous base only bonds with adenine.

guanine

This nitrogenous base only bonds with cytosine.

cytosine

This nitrogenous base only bonds with guanine.

adenine

This nitrogenous base only bonds with thymine.

AT GC (GC could stand for a certain college or university, such as Galveston College or even Garret College if you so please.)

And a way to remember which nitrogeneous base bonds with which.

ladder

First of all, just to get this straight, just so we're on the same page here - DNA is like a __.

sugar-phosphate molecules

Now, the outside of this so-called DNA "ladder" is made of __ - __ __.

deoxyribose

OK, so each sugar-phosphate molecule consists of a sugar called __, hence the name DEOXYRIBOnucleic acid, and a phosphate group. (This one's a little harder.)

adenine

The first (1st) of the four (4) nitrogeneous bases that make up DNA. It's also first in alphabetical order.

thymine

The last (last) of the four (4) nitrogenous bases. It's fourth in alphabetical order.

nitrogen bases

The rungs of the ladder are made up of other molecules called __ __.

cytosine

The second (2nd) of the four (4) nitrogenous bases that make up DNA. This one's second in alphabetical order.

guanine

The third (3rd) of the four (4) nitrogenous bases that make up DNA. It's third in alphabetical order. I hope you can tell by now that I have listed the four nitrogenous bases in ALPHABETICAL ORDER.