2.1.1 Mitosis as Part of the Cell Cycle

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2.1.1 Mitosis as Part of the Cell Cycle The Developing Cell 2.1.1 Mitosis as Part of the Cell Cycle

(b) Describe the structure of DNA and explain the importance of complementary base pairing and hydrogen bonding

Answer as many questions as you can. (you have 10 minutes) Starter Answer as many questions as you can. (you have 10 minutes)

Introduction to nucleotides Boardworks AS Biology Nucleic Acids and the Genetic Code Nucleotides are nitrogen-containing organic substances that form the basis of the nucleic acids DNA and RNA. All nucleotides contain the following three groups: a nitrogen-containing base a phosphate group a pentose sugar Teacher notes Some nucleotides, such as ATP, contain more than one phosphate group. A purine base is shown in the diagram – students should not confuse this with the pentose sugar. In DNA the sugar is deoxyribose, whereas in RNA the sugar is ribose.

Boardworks AS Biology Nucleic Acids and the Genetic Code Bases There are five bases, split into two types: A G adenine (A) and guanine (G) are purine bases. T C U thymine (T), cytosine (C) and uracil (U) are pyrimidine bases. Teacher notes Note that carbons have not been included in these diagrams for simplicity. DNA contains A, G, T and C, whereas RNA contains A, G, U and C.

Boardworks AS Biology Nucleic Acids and the Genetic Code Base pairing rules Boardworks AS Biology Nucleic Acids and the Genetic Code Teacher notes It should be clarified to students that RNA is single-stranded and so, generally, base pairing does not occur. However, in some cases, such as in tRNA, base pairing does take place.

Formation of polynucleotides Boardworks AS Biology Nucleic Acids and the Genetic Code Formation of polynucleotides Teacher notes Note that carbons have not been included in these diagrams for simplicity.

Which is the correct spelling? Nucleotide Nucloetide Nuclitide

What is the definition

Which is the correct spelling? Deoxiribose Deoxyribase Deoxyribose

What is the definition

Which is the correct spelling? Cystosine Cytosine Cystine

What is the definition?