Download - Edexcel IAL Biology A-level
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Edexcel IAL Biology A-level2.8-2.14 - Nucleotides and Nucleic Acids
Flashcards
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This work by PMT Education is licensed under CC BY-NC-ND 4.0
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Draw the structure of a nucleotide
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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)
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Name the pentose sugars in DNA & RNA
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Name the pentose sugars in DNA & RNA
DNA: deoxyribose
RNA: ribose
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Describe how polynucleotide strands form
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Describe how polynucleotide strands form
Condensation reactions between nucleotides form strong phosphodiester bonds (sugar-phosphate backbone)
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Describe the structure of DNA
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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)
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Describe the structure of RNA
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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
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Name the complementary base pairs in DNA
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Name the complementary base pairs in DNA.
2 H-bonds betweenadenine (A) + thymine (T)
3 H-bonds betweenguanine (G) + cytosine (C)
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Name the complementary base pairs in RNA
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Name the complementary base pairs in RNA.
2 H-bonds betweenadenine (A) + uracil (U)
3 H-bonds betweenguanine (G) + cytosine (C)
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Why is DNA replication described as semiconservative?
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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
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Summarise the process of DNA replication
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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
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What is the role of the enzyme DNA polymerase in DNA replication?
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What is the role of the enzyme DNA polymerase in DNA replication?
It catalyses the formation of phosphodiester bonds between the free nucleotides to form the new complementary strand of DNA
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Describe the Meselson and Stahl experiment procedure
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Describe the Meselson and Stahl experiment procedure - E. coli bacteria was grown in a growth medium containing an
isotope of nitrogen (15N)- The bacteria incorporated the isotope into the nucleotides- The bacteria were allowed to divide and samples were taken
after each division- The samples were centrifuged using a salt with a density
gradient
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Describe the results from the Meselson and Stahl experiment
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Describe the results from the Meselson and Stahl experimentGeneration 0 - All DNA contains only 15N nucleotides
Generation 1 - DNA produces a band showing an intermediate density which is due to the new DNA molecules produced containing one 15N strand and one 14N strand
Generation 2 - An intermediate band is also seen but there is now also a band showing a density of just 14N, proving that replication has to occur semi-conservatively
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What is the genetic code?
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What is the genetic code?
The genetic code is a term used to describe the linear sequence of nucleotides that determine the amino acid sequence in a protein
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What is meant by a triplet code?
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What is meant by a triplet code?
A triplet code is a section of DNA where groups of 3 nucleotides code for one amino acid
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What is meant by the genetic code being non-overlapping?
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What is meant by the genetic code being non-overlapping?
The genes are read in order so that the order of the genes determines the order of the amino acids in the polypeptide
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What is meant by the genetic code being degenerate?
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What is meant by the genetic code being degenerate?
Amino acids can be coded for by multiple different triplets. For example, AGA and CGA both code for the amino acid arginine
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What is a gene?
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What is a gene?
A section of DNA that codes for the sequence of amino acids in a protein
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Describe the structure of messenger RNA (mRNA).
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Describe the structure of messenger RNA (mRNA).● Long ribose polynucleotide with sugar-phosphate
backbone● Nitrogenous bases: A, U, G, C● Single-stranded & linear (no H-bonds between
complementary base pairs)● Codon sequence is complementary to exons of 1
gene from 1 DNA strandhttps://bit.ly/pmt-cc https://bit.ly/pmt-cchttps://bit.ly/pmt-edu
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State the function of mRNA
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State the function of mRNA
Transfers genetic code from DNA in nucleus to ribosomes for translation into a specific polypeptide
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What is the role of RNA polymerase in transcription?
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What is the role of RNA polymerase in transcription?
It catalyses the formation of phosphodiester bonds between adjacent RNA nucleotides to form the mRNA strand
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Outline the process of transcription
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Outline the process of transcription1. RNA polymerase binds to promoter region on a gene2. Section of DNA uncoils into 2 strands with exposed
bases. Antisense strand acts as template3. Free nucleotides are attracted to their complementary
bases4. RNA polymerase joins adjacent nucleotides to form
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Describe the structure of transfer RNA (tRNA)
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Describe the structure of transfer RNA (tRNA)
- Single strand folded into clover shape (some paired bases)
- Anticodon on one end, amino acid binding site on the other
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State the function of transfer RNA (tRNA)
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State the function of transfer RNA (tRNA)
Carries amino acids to specific codons on mRNA for translation
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What is a codon?
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What is a codon?
Three consecutive nucleotides which code for one amino acid
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What is an anticodon?
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What is an anticodon?
A sequence of three bases on a tRNA molecule which is complementary to a codon on an mRNA molecule
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What does translation produce and where does it occur?
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What does translation produce and where does it occur?
Produces proteins
Occurs in cytoplasm on ribosomes
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Outline the process of translation
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Outline the process of translation.1) mRNA travels to a ribosome2) The mRNA is passed through the ribosome 3 bases (one codon) at a time3) tRNA molecules with complementary anticodons to the mRNA codons
hydrogen bond4) The ribosome catalyses the formation of peptide bonds between the
amino acids on the tRNA molecules5) tRNA molecules leave, the ribosome moves along the mRNA and the
cycle repeats until the polypeptide has been synthesised● This process requires ATP
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What is a mutation?
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What is a mutation?
A random change to the base sequence in DNA which results in genetic variants
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List 3 types of mutations
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List 3 types of mutations
- Insertion mutation- Deletion mutation- Substitution mutation
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What is a substitution mutation?
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What is a substitution mutation?
Where one base gets swapped for another base
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What is a deletion mutation?
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What is a deletion mutation?
Where one or more bases are removed. This results in a frameshift mutation which alters all the codons after the error
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What is an insertion mutation?
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What is an insertion mutation?
Where one or more bases are added. This results in a frameshift mutation which alters all the codons after the error
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Give 3 effects of mutations
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Give 3 effects of mutations
Harmful - Can cause cellular damage and disease through the production of non-functional proteins
Neutral - The mutation causes no noticeable change to the function of the protein produced
Beneficial - Mutations which can prove beneficial to organisms and may produce proteins that are better adapted to their functions. This can give organisms a selective advantage
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What is cancer?
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What is cancer?
A non-communicable disease which is characterised by uncontrolled cell division. It can be caused by mutations in regulatory genes
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