Summary
Summary OCR A/AS-Level Biology 2.6.1 Cell Cycle
- Course
- Institution
- Book
Revision Summary of key knowledge from OCR A/AS-Level Biology 2.6.1 Cell Cycle.
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
OCR A-level Biology notes
-
OCR A-Level Biology 6.3.5 Gel Electrophoresis
-
OCR A-Level Biology 6.3.4 Polymerase Chain Reaction
Seller
Follow
izzylewington04
Content preview
Cell CycleCell Cycle
Consists of two main phases: m-phase and interphase
M-phase is division and interphase is the growth stages and synthesis stage
Checkpoints verify if processes have been completed correctly before ethe cell moves
onto the next stage
Molecule evets that control the cycle occur in a specific order to ensure the cycle
cannot be reversed and that DNA is only replicated once per cycle
Cells normally undergo about 50 cycles (Hayflick constant)
M-Phase G₁-Phase
Cell growth stops Cell grows
Nuclear division (mitosis or meiosis) Synthesis of enzymes and RNA for DNA
Cytoplasmic Division (Cytokinesis) replication
Checkpoint mechanism ensures cell is
ready for DNA replication
S-Phase G₂-Phase
DNA replication Cell grows
Rapid because exposed DNA is Checkpoint mechanism checks cell is
susceptible to mutation ready for division
G₀-Phase
Resting phase triggered if the G₁ checkpoint detects damage or if the cell cannot
continue the cell cycle
Attempts to repair damage then continue the cell cycle
If damage cannot be fixed, cell undergoes apoptosis (programmed cell death)
If a cell undergoes differentiation, it becomes specialised and can no longer continue
the cell cycle so remains carrying out its function indefinitely in G₀-phase
Mitosis
Nuclear division
DNA is moved into two separate nuclei
Forms two identical daughter cells
Basis of asexual reproduction
All multicellular organisms grow and repair using mitosis
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 or Stuvia-credit 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 izzylewington04. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.86. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
50843 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now