Lecture notes
Class notes for Chapter 6 Cell Divisions AS Level Biology A OCR
- Module
- Cell divisions
- Institution
- OCR
My class notes for cell divisions
[Show more]
Seller
Follow
Content preview
Cell Divisions:• Cell Cycle
• Mitosis
• Meiosis
• The Organisation and Specialisation of Cells
• Stem Cells
, The Cell Cycle
The cell cycle describes
periods of cellular division,
followed by periods of
cellular growth. One
parent cell divides to form
either two or four
daughter cells (mitosis and
meiosis respectively).
For single cellular
organisms, this is their
entire life cycle.
Growth 1 phase (40%):
- Proteins are replicated during semi-conservative replication.
- The cell increases in size.
- These new proteins are used to build new organelles.
Growth 1 checkpoint:
Checks for cell size, nutrients, growth factors and DNA damage
Synthesis phase (39%):
- DNA replication/synthesis in the nucleus.
Growth 2 phase (19%):
- The cell increases in size.
- Energy stores are increased.
- The duplicated DNA is checked for errors.
Growth 2 checkpoint:
- Checks for cell size, DNA replication and DNA damage
Metaphase:
- Mitosis (nuclear division)
- Cytokinesis (cytoplasmic division)
Metaphase/spindle assembly checkpoint:
Checks that chromosomes are correctly attached to spindle fibres.
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 hannahjackson392. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £5.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
73918 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now