MYTUTOR SUBJECT ANSWERS

430 views

How are Genes and DNA organised?

DNA

DNA stands for deoxyribose nucleic acid. It is a stable, double stranded helix structured molecule which encodes all of our genetic information. It consists of a sugar-phosphate backbone, held together by specific nucleootide pairs. The entire DNA content of an organism is described as the genome. Using an analogy of a library, the genome is the entire library.

Nucleotides

If the genome is the library, individual nucleotides are the letters on the pages of the books. There are 4 nucletide bases, Adenine (A), Guanine (G), Cytosine (C) and Thymine (T). When translated to RNA, Thymine becomes Uracil (U). These nucleotidea can be organised in various different orders.

Amino Acids

3 nucleotides encodes 1 amino acid. For example, if the genetic code read TCT, this would produce a Serine amino acid. An amino acid is the building block of a protein. Amino acids are like the chapters in a book, as the nucleotdies are organised into these different sections.

Genes

A sequence of amino acids will encode a gene. A gene can be thought of as the book which contains the chapters and letter. Each gene has a specific function. For exaple a specific gene for eye colour and there are hundreds of genes in our genome.

Chromosomes

Each gene has a specific position in the genome, known as a loci. This can be thought of as a specific position on a book shelf. The book shelves that books are packaged on to are the chromosomes. These are long, linear, X shaped structures which genes are packaged onto to jeep them stable within a cell.

Emma S. GCSE Biology tutor, A Level Biology tutor, GCSE Chemistry tut...

11 months ago

Answered by Emma, an A Level Biology tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

163 SUBJECT SPECIALISTS

£22 /hr

Hannah W.

Degree: Biology (Bachelors) - Bristol University

Subjects offered:Biology, Music+ 5 more

Biology
Music
Maths
History
English Literature
English Language
Chemistry

“Hi I'm Hannah and I am a Biology student at Bristol University. I have always loved the sciences, especially Biology and Chemistry but I am also passionate aboutcreative subjects such as Music and English.  I completely understand how...”

£20 /hr

Charles W.

Degree: Chemistry (Bachelors) - University College London University

Subjects offered:Biology, Maths+ 1 more

Biology
Maths
Chemistry

“Friendly approachable tutor with well thought out tutorials combined with excellent exam techniques”

£20 /hr

Lewis M.

Degree: Biology (Masters) - Bristol University

Subjects offered:Biology, Maths

Biology
Maths

“About Me: I am a Biology student at Bristol University. I have always loved science and maths and I hope this will come across in my sessions! I have been invloved with tutoring for the majority of my school life, taking time out of ...”

About the author

£20 /hr

Emma S.

Degree: Cellular Medicine (Doctorate) - Newcastle University

Subjects offered:Biology, Human Biology+ 1 more

Biology
Human Biology
-Personal Statements-

“About Me I am currently a PhD student at Newcastle University studying Molecular Genetics. Previous to this I completed my undergraduate studies in Genetics and a Masters in Genetics, both at the University of Liverpool. I have always...”

MyTutor guarantee

You may also like...

Other A Level Biology questions

Briefly describe the mechanism of muscle contraction.

Outline the process of ATP synthesis in mitochondria.

Explain the structure of a Protein and how this can relate to its function.

How are blood glucose levels controlled in the body?

View A Level Biology tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok