BRAINSTORM Start Timer 3 In your group brainstorm
BRAINSTORM Start Timer 3 In your group, brainstorm all your ideas about DNA. 1. 5 0 Include • What is DNA? • Where is DNA found? • What is its function?
National 5 Cell Biology Structure and Function of DNA
We are learning to: • Describe the relationship between DNA, genes and chromosomes • State where DNA is found within a cell • State that chromosomes are made of DNA • State the function of DNA • Describe the structure of DNA • Explain what is meant by complementary base pairing in DNA
What I'm looking for: • Diagram relating DNA, chromosomes and genes • Description of the function of DNA • Labelled diagram of DNA • Completed examples of complementary base pairing
Inside the nucleus
Inside the nucleus
What is DNA? • Watch the video • Read information on page 21 pupil booklet • Label and colour diagram of DNA to show – Two strands of DNA – Names of bases
What is DNA? Chromosomes and their genes are made of a molecule called DNA stands for deoxyribonucleic acid. Each chromosome is a very long molecule of tightly coiled DNA. The DNA molecule looks like a twisted ladder this spiral shape is called a DOUBLE HELIX DNA molecules carry the code that controls what cells are made of and what they do.
Chromosome Strand Cytosine Adenine Strand Guanine Thymine
DNA Bases The double helix ‘ladder’ of a DNA molecule is held together by ‘rungs’ made from pairs of chemicals called bases. There are four types of bases, and they are usually identified by their initials. A C G T
DNA Bases Base pairs hold the two strands of the DNA helix together. C G A T It is the sequence of these bases along a DNA molecule that forms the genetic code – it’s that simple!
DNA bases
I can: • Describe the relationship between DNA, genes and chromosomes • State where DNA is found within a cell • State that chromosomes are made of DNA • State the function of DNA • Describe the structure of DNA • Explain what is meant by complementary base pairing in DNA
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