A Level Biology - Nucleic Acids 2.3

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Last updated: December 14, 2017

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First submitted	December 14, 2017
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Definition

Keyword

Shape of DNA molecule

Double helix

Molecule that when repeated makes up a polymer

Monomer

Molecule consisting of a five-carbon sugar, a phosphate group and a nitrogenous base

Nucleotide

Large molecule containing many nucleotides

Polynucleotide

Enzyme that catalyses formation of DNA

DNA Polymerase

Enzyme that catalyses the breaking of hydrogen bonds between the nitrogenous pairs of bases in a DNA molecule

Helicase

How DNA replicates, resulting in two new molecules, each of which contains one old strand and one new strand

Semi-conservative replication

A length of DNA that codes for a polypeptide or for the length of RNA

Gene

A polymer made of many amino acid units joined together by peptide bonds

Polypeptide

A large polypeptide of 100 or more amino acids

Protein

The process of making messenger RNA from a DNA template

Transcription

Formation of a protein, at ribosomes, by assembling amino acids into a particular sequence according to the coded instructions carried from DNA to the ribosome by mRNA

Translation

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