Write the full form of DNA. Name the part of the cell where it is located. Explain its role in the process of reproduction of the cell.
Write the full form of DNA. Name the part of the cell where it is located. Explain its role in the process of reproduction of the cell.
Official answer
- Full Form of DNA: Deoxyribo Nucleic Acid.
- Location in the Cell: DNA is located in the chromosomes within the nucleus of a cell.
- Role of DNA in Cell Reproduction:
- Information Source: DNA is the primary source of information for making proteins. If this information is altered, different proteins will be made, leading to altered body designs.
- DNA Copying: A basic event in reproduction is the creation of a DNA copy using chemical reactions. This ensures that genetic features are inherited from parents to the next generation.
- Cellular Apparatus Creation: DNA copying is accompanied by the creation of an additional cellular apparatus. This is essential because a DNA copy pushed out without an organized cellular structure cannot survive or maintain life processes.
Marking scheme
- 1.State the full form of DNA as Deoxyribo Nucleic Acid (1 mark)
- 2.State the location of DNA (chromosomes in the nucleus) (1 mark)
- 3.Explain the role of DNA copying and protein synthesis in cell reproduction (1 mark)
Hint
Think about where chromosomes are found in a cell and what DNA stands for. Remember that DNA contains the blueprints for making proteins.
Quick oral answer
DNA stands for Deoxyribo Nucleic Acid. It is located in the chromosomes inside the cell nucleus. Its role is to act as the blueprint for making proteins and to transmit genetic information to the next generation through DNA copying.
Common mistakes
- 1.Writing incorrect spellings for 'Deoxyribo Nucleic Acid'.
- 2.Stating that DNA is located generally in the cytoplasm instead of specifically in the nucleus/chromosomes.
- 3.Failing to mention that DNA copying must be accompanied by the creation of an additional cellular apparatus for the cell to survive.
Analysis and explanation
According to the NCERT textbook, chromosomes in the nucleus contain genetic information in the form of DNA molecules. During cell division, the cell must make two copies of its DNA. However, simply copying the DNA is not enough; the cell must also duplicate its cellular machinery (cytoplasm, organelles) so that both resulting daughter cells are fully functional and capable of sustaining life. Variations occur during this copying process because no biochemical reaction is 100% accurate, which serves as the basis for organic evolution.
Interesting facts
No biochemical reaction is absolutely reliable. Therefore, every time DNA copies, minor variations are introduced, which is the fundamental driver of evolution!
Question details
Q25 of 27 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2010
- Section
- Section B
- Marks
- 3
- Type
- Short Answer
- Chapter
- How do Organisms Reproduce?
- Topic
- DNA and its Role in Reproduction
- Bloom's level
- Understanding
- Syllabus topic
- Do Organisms Create Exact Copies of Themselves?
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2010?
This question carries 3 marks in the CBSE Class 10 Science 2010 examination.
Which chapter does this question come from in Science?
This question is from the chapter "How do Organisms Reproduce?" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "DNA and its Role in Reproduction" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2010 paper?
This is a Short Answer question from Section B in the CBSE Class 10 Science 2010 paper.