Summary and Exam Tips for DNA Flashcard
DNA Flashcard is a subtopic of Biological Molecules, which falls under the subject Biology in the Cambridge IGCSE curriculum. DNA, or Deoxyribonucleic Acid, is the hereditary material in humans and almost all other organisms. Nearly every cell in a person’s body has the same DNA. Most DNA is located in the cell nucleus (nuclear DNA), but a small amount of DNA can also be found in the mitochondria (mitochondrial DNA). The information in DNA is stored as a code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T). Human DNA consists of about 3 billion bases, and more than 99 percent of those bases are the same in all people. The order, or sequence, of these bases determines the information available for building and maintaining an organism, similar to the way in which letters of the alphabet appear in a certain order to form words and sentences. DNA bases pair up with each other, A with T and C with G, to form units called base pairs. Each base is also attached to a sugar molecule and a phosphate molecule, together forming a nucleotide.
Exam Tips
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Understand the Structure: Familiarize yourself with the double helix structure of DNA and the base pairing rules. Remember, A pairs with T, and C pairs with G.
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Key Terms: Make sure you can define and explain key terms like nucleotide, base pairs, and genetic code. These are often tested in exams.
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Diagrams: Practice drawing and labeling the DNA structure. Visual aids can help reinforce your understanding and are useful in exams.
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Function and Location: Be clear about where DNA is found in the cell and its role in heredity and protein synthesis.
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Practice Questions: Use past papers and flashcards to test your knowledge and improve recall under exam conditions.
