Exam (elaborations)
Topic 3 A Level Biology Edexcel SNAB
- Course
- Institution
Topic 3 A Level Biology Edexcel SNAB
[Show more]
Seller
Follow
modocko752
Content preview
Topic 3 A Level Biology Edexcel SNABFunction of flagellum - ANS-provides movements so that sperm can swim to egg
Function of mitochondria - ANS-Aerobic respiration
Produces ATP for movement
Function of acrosome - ANS-Contains acrosin
Digests zona pellucida
Golgi apparatus - ANS-Membrane bound sacs
Sacs in stacks
Flattened
No ribosomes
Golgi apparatus role - ANS-Modifies protein
Adds/trims carbohydrate chain
Packages proteins in secretory vesicles
Export by exocytosis
End result of mitosis - ANS-Chromatids separated
2 nuclei present
End result of S phase - ANS-DNA replicated
Quantity of DNA doubles
Process during cell specialisation - ANS-Chemical stimulus required
Causes some genes to be activated
mRNA transcription happens at activated gene
Translation happens and protein's formed
Protein modifies structure and function
Specialising the cell
Differences between tissues and organs - ANS-Tissues made of cells + organs made of
tissues
Organs have more functions than tissues
Tissues made of one type of cells + organs made of different tissues
, Polygenic inheritance - ANS-More than one gene for a single characteristic
On more than one locus
Continuou variation
Cortical reaction - ANS-Ensures that only one sperm fertilises the egg
Sieve tube element doesn't require rER and ribosomes as... - ANS-No mRNA so
ribosomes not required for translation
No proteins will be synthesised to be processed in the ER
Some bacteria grow rapidly in skin wounds as - ANS-Temp is warm, increasing rate of
reactions in bacteria
Availability of energy source from tissue
Availability of water for bacterial cell functions
Oxygen availability is good allowing areobic respiration
Advantages of eel having larger egg cell - ANS-Bigger target for sperm to hit, aids
fertilisation in open water
Larger egg has more lipid droplets
So it provides more energy can develop
How polypeptide is processed to make AFGP - ANS-Polypeptide chain moves thru ER
then Golgi apparatus.
Polypeptide's in rER
Carbohydrate added to Golgi apparatus
Protein's transported around cell in vesicle
How does each gamete receives only one allele of each gene - ANS-Homologous
chromosomes separated from one another in meiosis
Sister chromatids separated from another
Spindle fibres pull chromatids to opposite poles of cells
Meiosis' importance in producing gametes - ANS-1/2 chromosome number
produce haploid nucleus
when fertilised, diploid chromosome n. restored
allows genetic variation
thru independent assortment + crossing over
Pluripotent - ANS-can differentiate + give rise to many cell types
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 modocko752. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67096 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now