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Science (English Medium) Class 12 - CBSE Question Bank Solutions for Biology

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Biology
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In a cell, DNA transcription is halted when ______ 

[5] Molecular Basis of Inheritance
Chapter: [5] Molecular Basis of Inheritance
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Read the following and answer from given below:

The translation is the process of polymerization of amino acids to form a polypeptide. The order and sequence of amino acids are defined by the sequence bases in the mRNA. The amino acids are joined by a bond called a peptide bond. The ribosome is the site of protein synthesis.

Which ion is essential for the association of both units of the ribosome at the time of protein formation?

[5] Molecular Basis of Inheritance
Chapter: [5] Molecular Basis of Inheritance
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Which of the following glands is large-sized at birth but reduces in size with ageing?  

[7] Human Health and Diseases
Chapter: [7] Human Health and Diseases
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Which of the following is not a lymphoid tissue?

[7] Human Health and Diseases
Chapter: [7] Human Health and Diseases
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Where are B-cells and T-cells formed? How do they differ from each other?

[7] Human Health and Diseases
Chapter: [7] Human Health and Diseases
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What would happen to the immune system if the thymus gland is removed from the body of a person?

[7] Human Health and Diseases
Chapter: [7] Human Health and Diseases
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Lymph nodes are secondary lymphoid organs. Explain the role of lymph nodes in our immune response.

[7] Human Health and Diseases
Chapter: [7] Human Health and Diseases
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What does the term `memory' of the Immune system mean?

[7] Human Health and Diseases
Chapter: [7] Human Health and Diseases
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Epithelial lining of our intestine is considered as secondary lymphoid organ. Justify the statement.

[7] Human Health and Diseases
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Explain the role of Primary and Secondary Lymphoid organs with the help of suitable examples.

[7] Human Health and Diseases
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Name the secondary lymphoid organs.

[7] Human Health and Diseases
Chapter: [7] Human Health and Diseases
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What is a cistron?

[5] Molecular Basis of Inheritance
Chapter: [5] Molecular Basis of Inheritance
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State the difference between the structural genes in a Transcription Unit of Prokaryotes and Eukaryotes.

[5] Molecular Basis of Inheritance
Chapter: [5] Molecular Basis of Inheritance
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Give one example of point mutation.

[4] Principles of Inheritance and Variation
Chapter: [4] Principles of Inheritance and Variation
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Explain (in one or two lines) the function of the following:

tRNA

[5] Molecular Basis of Inheritance
Chapter: [5] Molecular Basis of Inheritance
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Explain (in one or two lines) the function of the following:

Exons

[5] Molecular Basis of Inheritance
Chapter: [5] Molecular Basis of Inheritance
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Answer the following question.
You are conducting artificial hybridization on papaya and potato. Which one of them would require the step of emasculation and why? However, for both, you will use the process of bagging. Justify giving one reason.

[1] Sexual Reproduction in Flowering Plants
Chapter: [1] Sexual Reproduction in Flowering Plants
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Answer the following question.
Two children, A and B aged 4 and 5 years respectively visited a hospital with a similar genetic disorder. The girl A was provided enzyme-replacement therapy and was advised to revisit periodically for further treatment. The girl, B was, however, given a therapy that did not require revisit for further treatment.

Name the ailments the two girls were suffering from?

[4] Principles of Inheritance and Variation
Chapter: [4] Principles of Inheritance and Variation
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Emasculation and bagging are the two important steps carried during artificial hybridization to obtain superior varieties of desired plants. Explain giving reasons, in which types of flowers and at what stages are the two processes carried out.

[1] Sexual Reproduction in Flowering Plants
Chapter: [1] Sexual Reproduction in Flowering Plants
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Answer the following question.
Two children, A and B aged 4 and 5 years respectively visited a hospital with a similar genetic disorder. The girl A was provided enzyme-replacement therapy and was advised to revisit periodically for further treatment. The girl, B was, however, given a therapy that did not require revisit for further treatment.

Why did the treatment provided to girl A required repeated visits?

[4] Principles of Inheritance and Variation
Chapter: [4] Principles of Inheritance and Variation
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