DNA is sometimes called “the blueprint of life” because it contains the code, or instructions for building and organism and ensuring that organism functions correctly. It is the chemical component of chromosomes, which are located in the nucleus of every cell. Stretches of DNA (or stretches of chromosomes) code for genes.

The shape of the DNA molecule is a double-helix (like a twisted ladder). The sides of the ladder are composed of alternating sugars (deoxyribose) and phosphates. The rungs of the ladder are composed of nucleotides.

Nucleotides pair in a specific way – called the Base-Pair Rule

Adenine pairs to Thymine

Guanine pairs to Cytosine

How I remember it A,T or  At and gato means cat or G-C

Chargaff’s Rule

In DNA, the amount of A = the amount of T and the amount of C = the amount of G


RNA is a copy of DNA that goes out into the cytoplasm and basically tells the cell which proteins to make. RNA has the same shape as DNA except that it is a single stranded the R stands or ribonucleic acid and that there are

Uracil (U)

Adenine (A)

Guanine (G)

Cytosine (C)

This animation helps a lot with explaining how DNA works to make protein http://highered.mcgraw-hill.com/sites/0072507470/student_view0/chapter3/animation__how_translation_works.html


Posted on April 13, 2013, in Week in review. Bookmark the permalink. Leave a comment.

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