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The Meaning and Examples of Dna

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1. What is a nucleotide? Complex biological polymer called a nucleic acid, which is made up of small subunits called nucleotides. 2. What is a nucleotide made up of? Nucleotides are made from genetic materials. 3. Why do DNA and RNA each have four nucleotides? DNA and RNA both need three things to make up a nucleotide: phosphate group, a sugar, and 1 of the 4 nitrogen bases. 4. Name the four nucleotides of DNA? Adenine(A), Guanine(G), Cytosine(C), Thymine(T) 5. Name the four nucleotides of RNA? Adenine(A), Guanine(G), Cytosine(C), Uracil(U) 6. Name the two purine nitrogen bases? Adenine and Guanine. 7. Name the three pyrimidine nitrogen bases? Uracil, Thymine, and Cytosine. 8. Make a model of a DNA. KEY: Orange= Phosphate, Blue & Black= Sugar, Green= Guanine, Red= Adenine, Purple= Thymine, Yellow= Cytosine. 9. Write your DNA model sequence and give a replica or copy of it. ACGTAC= TGCATG 10. Transcribe your DNA into an mRNA. UGCAUG 11. Translate the mRNA into a protein or polypeptide- you need the genetic code. CYS. MET. 12. Why is it that no two organisms are exactly the same? Since no two organisms have the same DNA sequence then no two organisms are the same. 13. Name and describe the two steps of gene expression. Transcription is the process that changes the DNA into RNA. Translation is the process that creates a protein out of the RNA. 14. What is a mutation? Mutations are changes in the DNA sequence. 15. Using a hypothetical DNA, show examples of point mutations and frameshift DNA mutations. Cystic fibrosis, Cancer, HIV, Cures 16. Using a hypothetical chromosome, explain the four types of chromosomal mutations. Insertion mutation, a sizable length of DNA is inserted into a gene. Deletion mutations, segments of a gene are lost, often during meiosis. Duplication is a doubling of a section of the

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