BIOLOGY 1A03 Lecture Notes - Lecture 9: Deoxyribose, Thymine, Polynucleotide
doinhumolalala and 39849 others unlocked
9
BIOLOGY 1A03 Full Course Notes
Verified Note
9 documents
Document Summary
3. 3. 1 - outline dna nucleotide structure in terms of sugar (deoxyribose), base and phosphate. Nucleotides are formed from a pentose sugar, phosphate and a base: phosphate links neighbouring sugars together (po4, the sugar is either ribose for rna or deoxyribose for dna, which has one less oxygen. 3-: four types of bases, which comprise the coded genetic message. Cytosine (c), guanine (g), adenine (a), thymine (t: nucleotides form sequences, which are instructions for the organism, changes to nucleotides cause mutations. 3. 3. 2 - state the names of the four bases in dna. Uracil replaces thymine in rna (u) www. ibscrewed. org. 3. 3. 3 - outline how dna nucleotides are linked together by covalent bonds into a single strand. Two covalent bonds between the oh- and acidic phosphate group. Nucleotides bond at the 3l (three prime) end of the molecule. To form the polynucleotide, the nucleotides condense together one at a time, giving water in the reaction.