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Practice each question, then open the answer or worked solution.
The two strands in DNA are not identical but are complementary. Explain.
Answer: In DNA, cytosine pairs with guanine and adenine pairs with thymine, so the strands hold together by specific hydrogen bonds. This makes the strands complementary, not identical.
Write the important structural and functional differences between DNA and RNA.
| DNA | RNA |
|---|---|
| The sugar present here is β-D-2-deoxyribose. | The sugar present here is β-D-ribose. |
| It contains thymine (T). | It contains uracil (U). |
| The helical structure is double-stranded. | The helical structure is single-stranded. |
| Functional differences: It is the chemical basis of heredity. They do not synthesize proteins but transfer coded messages for the synthesis of proteins in the cells. |
Functional differences: It is not responsible for heredity. Proteins are synthesized by RNA molecules in the cells. |
Solution coming soon.
What are the different types of RNA found in the cell?
Answer: The types of RNA in cells are: messenger RNA (mRNA), ribosomal RNA (rRNA), and transfer RNA (tRNA).