MYTUTOR SUBJECT ANSWERS

310 views

How is DNA packaged within Eukaryotic Cell nucleosomes

DNA is wrapped around proteins called histones, to form nucleosomes. Each nucleosome is a histone octomer composed of (H2A, H2B, H3, and H4) subunits with a 1.65 helical turn of 147 nucleotide bases. Nucleosomes then fold upon themselves to form chromatin. 

Loosely packed Chromatin called euchromatin is assoicated with high gene expression whereas densely packed chromatin called heterochromatin is associated with transcriptional repression (gene silencing). 

During metaphase stage of mitosis and meiosis chromatin becomes supercoilded resulting in the ability to see chromosomes under a microscrope. This is essential for the seperation of DNA between daughter cells. 

Rosewan A. GCSE Biology tutor, A Level Biology tutor, Mentoring -Medi...

1 year ago

Answered by Rosewan, an A Level Biology tutor with MyTutor

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

132 SUBJECT SPECIALISTS

£20 /hr

Merle B.

Degree: Biology (Bachelors) - York University

Subjects offered: Biology, German

Biology
German

“About me: I am an EU student from Hamburg, a city in northern Germany. After Grade 7, at the age of 13, I transferred to Townshend International School in Czech Republic. Through the encouragement and dedication of my friendly teacher...”

£20 /hr

Ruth W.

Degree: Biochemistry (Masters) - Birmingham University

Subjects offered: Biology, Science+ 3 more

Biology
Science
Physics
Maths
Chemistry

“About Me: I am a biochemistry student at the University of Birmingham.  I have always had a real passion and love for all things science and maths and I hope that my tutorials will instil this love in you too. I’m very patient and fr...”

£20 /hr

Constantinos C.

Degree: MRes Ecology, Evolution and Conservation (Masters) - Imperial College London University

Subjects offered: Biology, Physics+ 3 more

Biology
Physics
Maths
History
-Personal Statements-

“I am a Biology graduate, and thus have the necessary critical thinking and learning skills that I can transfer to you. I am now a student in a research-based Masters at Imperial College. During university, I have worked as a mentor an...”

About the author

Rosewan A.

Currently unavailable: for regular students

Degree: Medicine (Other) - Newcastle University

Subjects offered: Biology, -Medical School Preparation-

Biology
-Medical School Preparation-

“Hello I’m Rosh, a graduate and a second year medical student at Newcastle University. Itutor Biology, Chemistry and can give considerable guidance on Medical school applications for both Undergraduate and graduate programs. I’ve work...”

MyTutor guarantee

You may also like...

Posts by Rosewan

How is DNA packaged within Eukaryotic Cell nucleosomes

What are is the function of a ribosomes and what is it made from?

What are the functional differences between RNA and DNA

Other A Level Biology questions

What is the mitochondria and what is its role within the cell?

Describe the changes at the cell membrane of a neuron during an action potential.

What is chromatin?

How are blood glucose levels controlled in the body?

View A Level Biology tutors

Cookies:

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

mtw:mercury1:status:ok