1. Components of DNA and RNA molecules:
- DNA: Deoxyribose sugar, phosphate group, nitrogenous bases (adenine, thymine, cytosine, guanine)
- RNA: Ribose sugar, phosphate group, nitrogenous bases (adenine, uracil, cytosine, guanine)
2. Structural difference between DNA and RNA:
- DNA is double-stranded; RNA is single-stranded.
- DNA contains deoxyribose sugar; RNA contains ribose sugar.
- DNA uses thymine as a nitrogenous base; RNA uses uracil instead of thymine.
3. Nitrogenous base found in RNA but not in DNA:
- Uracil
4. Comparison table:
| Basis of comparison | DNA | RNA |
|---------------------|--------------------|--------------------|
| 1. Number of strands | Double-stranded | Single-stranded |
| 2. Location in the cell | Nucleus (mainly) | Cytoplasm (mainly) |
| 3. Type of sugar | Deoxyribose | Ribose |
| 4. Nitrogenous base pair | A-T, C-G | A-U, C-G |
5. Guide Questions:
Q1. What are the components of DNA and RNA molecule?
- DNA: Deoxyribose sugar, phosphate group, nitrogenous bases (A, T, C, G)
- RNA: Ribose sugar, phosphate group, nitrogenous bases (A, U, C, G)
Q2. What is the structural difference between DNA and RNA?
- DNA is double-stranded with deoxyribose sugar and thymine; RNA is single-stranded with ribose sugar and uracil.
Q3. What nitrogenous base is found in RNA but not in DNA?
- Uracil
6. Three types of RNA:
- Messenger RNA (mRNA): Transcribes the DNA nucleotide bases to RNA nucleotide bases
- Ribosomal RNA (rRNA): Binds the mRNA and tRNA to ensure that codons are translated correctly
- Transfer RNA (tRNA): Translates the mRNA codons into the correct amino acids
7. Two stages of protein synthesis:
- Transcription
- Translation
Parent Tip: Review the logic above to help your child master the concept of dna to rna to protein worksheet.
