Cambridge International AS and A Level Biology Coursebook with CD-ROM
Complete and concise notes on Nucleic acid and protein synthesis for A Level Biology (9700) with supporting syllabus points referenced to respective content.
🧫
Chpt 5: The Mitotic Cell Cycle
(Cell cycle and nuclear division)
Chromosomes
Describe the structure of a chromosome
Structures:
Chpt 5: The Mitotic Cell Cycle (Cell cycle and nuclear division) 1
, 1. Telomeres: A region of repetitive nucleotide sequences at each end of a
chromatid, which:
a. Allows chromosome to replicate properly during cell division: during
replication, chromosome is shortened (DNA is lost) - prevents loss of
entire genes
b. Help organise chromosomes in cells
c. Prevents the chromosomes from unravelling and sticking to other
chromosomes, by acting as a cap/aglet
2. Chromatids: Identical strands of DNA, bound by centromere (1 chromatid = 1
DNA molecule)
a. Sister chromatids: genetically identical chromatids that make up the stx
of the chromosome
3. Kinetochore: the protein structure on chromatids, next to centromere,
containing a binding site, site for the attachment of spindle fiber
4. Genes: small sections of DNA that code for a particular protein and give
rise to a specific feature
DNA structure is maintained by histone proteins
5. Centromere: a narrow region containing no DNA which binds the 2 sister
chromatids together
Cell cycle
Outline the stages of the mitotic cell cycle
1. Interphase: cell growth
Longest phase in the cell cycle
Longest phase: G1
Where cell grows to normal size after division and carries out normal
functions - making proteins
All genetic material is in the form of chromatins
Chpt 5: The Mitotic Cell Cycle (Cell cycle and nuclear division) 2
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller puterihazmyr. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £6.37. You're not tied to anything after your purchase.
