Exam (elaborations)
EDEXCEL IAL BIOLOGY A-LEVEL 2.8-2.14 - NUCLEOTIDES AND NUCLEIC ACIDS
- Course
- Institution
EDEXCEL IAL BIOLOGY A-LEVEL 2.8-2.14 - NUCLEOTIDES AND NUCLEIC ACIDS
[Show more]
Seller
Follow
GEEKA
Reviews received
Content preview
EDEXCEL IAL BIOLOGY A-LEVEL 2.8-2.14 -NUCLEOTIDES AND NUCLEIC ACIDS
Draw the structure of a nucleotide
A pentose (5 carbon) sugar (either ribose or deoxyribose), a phosphate group and a
nitrogenous base (either adenine, guanine, cytosine, thymine or uracil)
Name the pentose sugars in DNA & RNA
DNA: deoxyribose RNA: ribose
Describe how polynucleotide strands form
Condensation reactions between nucleotides form strong phosphodiester bonds (sugar-
phosphate backbone)
Describe the structure of DNA.
Double helix of 2 deoxyribose polynucleotide strands (so there are 2 sugar-phosphate
backbones)
H-bonds between complementary base pairs on opposite strands (AT & GC)
Describe the structure of RNA.
Single stranded. Made up of ribose mononucleotides, linked through condensation
reactions. Possible bases are A,C, G and U. C pairs with G, A pairs with U
, Name the complementary base pairs in DNA.
2 H-bonds between adenine (A) + thymine (T)
3 H-bonds between guanine (G) + cytosine (C)
Name the complementary base pairs in RNA.
2 H-bonds between adenine (A) + uracil (U)
3 H-bonds between guanine (G) + cytosine (C)
Why is DNA replication described as semiconservative?
Strands from original DNA molecule act as templates
New DNA molecule contains one old strand and one new strand
Summarise the process of DNA replication
1. Double helix unwinds and the hydrogen bonds break, catalysed by DNA helicase
2. Complementary base pairing occurs between the template strand and free
nucleotides
3. The nucleotides are joined by phosphodiester bonds, catalysed by DNA polymerase
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 EFT, 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 this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller GEEKA. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R205,52. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67474 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now