Help with DNA and the triplet code needed!!!

  • -1 votes

Can someone explain to me what nucleotides are, what genes are and how they all make up DNA? Also What is the triplet code?

It's for unit 2 biology AQA (AS level).

Thank you.

Posted Mon 14th January, 2013 @ 16:16 by Tilly - Team GR

11 Answers

  • 4 votes

DNA is made up of lots of nucleotides.

NUCLEOTIDE: combination of 3 components- a sugar called deoxyribose, a phosphate group and the bases adenine, thymine, cytosine and guanine

GENES is just a small section of that DNA. It is the specific sequence/order of the bases (adenine thymine, cytosine and guanine).

THE TRIPLET CODE is a seguence of 3 bases that code for a specific amino acid. e.g. AGC codes for one amino acid while GTA codes for another different one.

 3 bases in a row make an amino acid. The sequence of  amino acids is the primary structure of polypeptides. Polypeptides combine to form a protein this means DNA indirectly codes for proteins.

hope that made it a little clearer. im doing this too and its very complicated. i've done some quizes on this so if you wanna check them out i'd like that too.

Answered Mon 14th January, 2013 @ 17:46 by sabrina76
Edited by sabrina76 on Mon 14th January, 2013 @ 17:59
  • 1 vote

Really sorry, I don't know cause Im not doing AS yet (still on GCSEs), but the first thing that I would do is Google it. 

Hope this helps (though its not much) as you helped me :)

Answered Mon 14th January, 2013 @ 17:21 by Crystal Blue ♥
  • 1 vote

THANK YOU SO MUCH!!!! I didn't get it at all before, and now it makes more sense. It's really complex and I couldn't figure it out. 

You're a lifesaver Sabrina! :)

Answered Mon 14th January, 2013 @ 17:48 by Tilly - Team GR
Edited by Tilly - Team GR on Mon 14th January, 2013 @ 17:48
  • 1 vote

You're not dumb. You just have not studied the work yet. You can't know something if you've never learnt the work. When I first started my AS levels I didn't have a clue, but you learn it and  then you understand it. :) You ask questions and your knowledge grows. 

Answered Mon 14th January, 2013 @ 18:29 by Tilly - Team GR
  • 0 votes

Thank you for the advice. : )

Answered Mon 14th January, 2013 @ 17:29 by Tilly - Team GR
  • 0 votes

your welcome ;)

Answered Mon 14th January, 2013 @ 18:01 by sabrina76
  • 0 votes

Woww I feel so dum :(

Answered Mon 14th January, 2013 @ 18:04 by Crystal Blue ♥
  • 0 votes

Oh well, at least I know now :)

Answered Mon 14th January, 2013 @ 18:35 by Crystal Blue ♥
  • 0 votes

Does anyone know where I can find some practise questions on this so I can try to remember it?

Answered Thu 24th January, 2013 @ 18:28 by Gabriella
  • 0 votes

This website is quite good but there are only 17 short questions.

http://anthro.palomar.edu/practice/bioquiz5.htm

Answered Thu 24th January, 2013 @ 19:00 by Tilly - Team GR
  • 0 votes

thank you :)

Answered Sat 26th January, 2013 @ 15:06 by Gabriella