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The Structure Of Dna And Rna

The Structure of DNA and RNA

State Standard 5a – Students know the general structure and functions of DNA, RNA, and protein

Purpose – To construct a molecule of DNA using models and to compare the structure of DNA with RNA

Molecule

Color of Pop Bead

Deoxyribose

White (32)

Phosphate

Red (32)

Adenine

Yellow (8)

Thymine

Orange (8)

Cytosine

Blue (8)

Guanine

Green (8)

Nucleic Acids

Both DNA and RNA are nucleic acids Nucleic acids consist of long chains of nucleotides. Nucleotides are

made up of 3 molecules: a 5 carbon sugar

a phosphate group

a nitrogenous base

The Structure of DNA (deoxyribonucleic acid)

The DNA nucleotides that make up DNA contain the following molecules:

Deoxyribose (5 carbon sugar)

2. A phosphate group

3. One of the following nitrogenous bases: guanine

cytosine

adenine

thymine

The name of the nucleotide is always the same as the base that it contains.

Using the models and the key to the models chart, construct 8 adenine, 8 thymine, 8 cytosine

and 8 guanine nucleotides.

2. Once step 1 is completed have your teacher initial your answer sheet.

3. Answer the following questions on your answer sheet.

a. What 3 molecules make up a DNA nucleotide?

b. What are the 4 different bases found in a DNA molecule?

c. To which molecule does the phosphate join?

d. To which molecule does the nitrogenous base join?

e. What are the names of the 4 different DNA nucleotides?

The Structure Of Dna And Rna