1.What is the function of DNA?

2.Name 3 parts of DNA molecule

3.Describe the shape of DNA molecule

4 answers

DNA is the code from which all protein is synthesised

Phosphate, nitrogen base, sugar

IT is a spiral molecule consisting of two chains, connected by base pairs.

Surely this is in your text.
it probably is but i don't understand the material...its a university level textbook and i'm only in grade 10
I suggest you Google the terms you don't understand. Find websites that you do understand. For instance, I Googled function DNA and found this comprehensible website.

http://caligula.bcs.deakin.edu.au/bcs_courses/forensic/Chemical%20Detective/DNA_function.htm
Ask your teacher to recommend supplemental reading material, I suspect the teacher has a library of books at varying levels. YOu may be interested in SChaumn's Outline Series, xxxx biology. Go to BarnesNoble and take a look, they are relatively inexpensive, and very helpful. XXXX is a name, probably General Biology in your case. Ask your mom to go with you.