MYTUTOR SUBJECT ANSWERS

363 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

121 SUBJECT SPECIALISTS

£20 /hr

Alexander A.

Degree: Molecular Cell Biology (with a year in industry) (Bachelors) - York University

Subjects offered: Biology, Maths

Biology
Maths

“I am an enthusiastic and patient tutor with a love for science that I want to share!  I am currently reading molecular cell biology at the University of York. I have had previous experiencing tutoring at A-level peer mentoring as part...”

MyTutor guarantee

£22 /hr

Shivali J.

Degree: Medicine (Bachelors) - Imperial College London University

Subjects offered: Biology, Maths+ 5 more

Biology
Maths
Chemistry
.UKCAT.
.BMAT (BioMedical Admissions)
-Personal Statements-
-Medical School Preparation-

“Who am I? I am a first year medical student at Imperial College London. I have always been curious about the world we live in and have satisified this innate drive to understand the world around us through science. I hope to share thi...”

£22 /hr

Sharon Y.

Degree: Medicine (Bachelors) - Oxford, St Peter's College University

Subjects offered: Biology, Mandarin+ 5 more

Biology
Mandarin
Chemistry
.UKCAT.
.BMAT (BioMedical Admissions)
-Personal Statements-
-Medical School Preparation-

“About Sharon Hi! I'm a second year medic at St Peter's College in Oxford, and I can't wait to meet you all! I've been tutoring students in the Lower Sixth and below since I was at boarding school and assisted teaching an adult beginnn...”

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

How are enzymes inhibited?

What are the steps involved in the mark-release-recapture technique and which factors does it rely upon?

How are chloroplasts adapted to their function?

Why is the polymerase chain reaction important and how does it work?

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