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AP Biology 2014 > Structure of DNA > Flashcards

Flashcards in Structure of DNA Deck (10):
1

Who discovered the structure of DNA?

Francis Crick and James Watson

2

What four nucleotide bases make up DNA?

Thymine, Guanine, Adenine, Cytosine

3

What type of unique structure does DNA have?

Double Helix

4

How was the structure of DNA discovered?

The work of Rosalind Franklin, who used X-Ray diffraction to get a closer look at DNA, would lead to the discovery of the structure of DNA by Francis Crick and James Watson. Francis Crick and James Watson presented a model of DNA as a double helix structure; they figured out that the structure had a smooth sugar-phosphate backbone with two pieces of equal length that latched together with separate yet specific base pairs (Ex. Thymine-Adenine, Cytosine-Guanine).

5

What does 'DNA' stand for?

Deoxyribonucleic acid

6

What three parts make up a nucleotide?

A sugar, a phosphate, and a base

7

What is a nucleoside?

A molecule made up of one of the four DNA bases covalently bonded to a sugar

8

Purine

Two carbon nitrogen ring bases (Adenine & Guanine)

9

Pyrimidine

One carbon nitrogen ring bases (Thymine & Adenine)

10

How are DNA strands read?

From the 5' end to the 3' end
-The 5' ends in a phosphate group
-The 3' ends in a sugar molecule