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Chapter 10
Nucleic Acids and Protein Synthesis
| Term | Definition |
|---|---|
| DNA | Deoxyribonucleic acid |
| Subunits of DNA | Nucleotides |
| Parts of a nucleotide (3) | Sugar, phosphate, base |
| Sugar present in DNA | Deoxyribose |
| Phosphate present in DNA | Phosphorous |
| Bases present in DNA (4) | Adenine, guanine, cytosine, thymine |
| Purines (2) | Adenine and guanine |
| Pyrimidines (2) | Cytosine and thymine |
| Scientists who suggested double helix model | Watson and Crick |
| Award won by Watson and Crick | 1962 Nobel Prize in Medicine |
| Complementary base pairs | C-G, T-A |
| Replication | Process of copying DNA |
| Helicases | Enzymes that separate base pairs |
| DNA polymerase | Enzymes that bind to the separated chains of DNA |
| Error rate in paired nucleotides | 1 in 1 billion |
| Mutation | Caused by a change in the nucleotide sequence |
| RNA | Ribonucleic acid |
| Base not present in RNA | Thymine |
| Base present only in RNA | Uracil |
| Sugar present in RNA | Ribose |
| Types of RNA (3) | Messenger RNA (mRNA), Transfer RNA (tRNA), Ribosomal RNA (rRNA) |
| Shape of mRNA | Single uncoiled chain |
| Shape of tRNA | Hairpin shape |
| Shape of rRNA | Globular form |
| Most abundant form of RNA | rRNA |
| Purpose of mRNA | Carries genetic info from DNA in the nucleus to the cytosol |
| Purpose of tRNA | Binds to specific amino acids |
| Purpose of rRNA | Makes up the ribosomes where proteins are made |
| Number of varieties of tRNA | 45 |
| Protein synthesis | Production of proteins |
| Number of amino acids | 20 |
| Genetic code | Correlation between a nucleotide sequence and an amino acid sequence |
| Codon | 3 mRNA nucleotides |
| Translation | Process of assembling polypeptides from information encoded in mRNA |
| Anticodon | 3 tRNA nucleotides; pairs with the mRNA codon |
| Ribosomes | Composed of rRNA and proteins |
| Location of ribosomes | Free in the cytoplasm and attached to the endoplasmic reticulum |