(b)++DNA+structure

(b) DNA Structure (Q 4-9) Complete Biology: page 190 ( Section 11.2 ).

(4) Insert the diagram page 190 ( Section 11.2 ) to Show the link DNA → protein → Characteristic. Write a sentence to explain what this means. DNA is the abbreviation of deoxyribonucleic acid, these are the building blocks of genes. Genes carry one function (or a protein) and this one function is responsible for one characteristic.

(5) What is the DNA molecule made up of?

DNA molecules are made up of nucleotides. Each nucleotide contains a base, and a sugar-phosphate backbone.

(6) How many different nucleotide molecules are there? List these.

There may be millions of nucleotides in a DNA molecule, but there are only four different ones. Some contain the base adenine (A), some contain guanine (G), some thymine (T) and some cytosine(C).

(7) Write a sentence to explain which bases always match up together.

The base pairs are always one of these two types: adenine with thymine or guanine with cytosine.

(8) What shape is the DNA molecule (2 special words)? Draw a quick sketch (labeled) to show this shape.

(SEE QUESTION 9)
 * DOUBLE HELIX **

(9) Find and insert at least one image or YouTube (or other) video to show the structure of DNA.

