Question 71 of 89
Strategies For Enhancement In Food Production
Inbreeding depression is:
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Year-wise Biology practice
NEET (Oct)2020 Biology PYQs
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89 questions in this collection · Page 8 of 9
Question 72 of 89
Microbes In Human Welfare
Cyclosporin A, used as immuno suppression agent, is
produced from:
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Question 73 of 89
Microbes In Human Welfare
Match the following columns and select the correct
option:
| Column-I | Column-II |
|---|---|
| (A)Dragonflies | (I)Biocontrol agents of several plant pathogens |
| (B)Bacillus thuringiensis | (II)Get rid of Aphids and mosquitoes |
| (C)Glomus | (III)Narrow spectrum insecticidal applications |
| (D)Baculoviruses | (IV)Biocontrol agents of lepidopteran plant pests |
| (V)Absorb phosphorus from soil |
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Question 74 of 89
Biotechnology Principles And Processes
Match the following techniques or instruments with their usage:
| Column-I | Column-II |
|---|---|
| (A)Bioreactor | (I)Separation of DNA fragments |
| (B)Electrophoresis | (II)Production of large quantities of products |
| (C)PCR | (III)Detection of pathogen, based on antigen - antibody reaction |
| (D)ELISA | (IV)Amplification of nucleic acids |
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Question 75 of 89
Biotechnology Principles And Processes
First discovered restriction endonuclease that always cuts DNA molecule at a particular point by recognising a specific sequence of six base pairs is:
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Question 76 of 89
Biotechnology Principles And Processes
Select the correct statement from the following:
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Explanation:
Option 3 is correct. Restriction enzyme digestions involve incubating purified DNA with restriction enzymes under optimum conditions to cut DNA at specific sequences. This is a standard step in gene cloning as per NCERT.
🧠 Did You Know?
Gel electrophoresis (option 1) is for separating DNA fragments, not amplifying them. PCR (option 4) amplifies DNA, not isolates or separates it. Ligation by DNA ligase (not listed) joins gene and vector (a different process from what PCR or restriction digestion does).
💡 NCERT Memory Line:
Restriction enzymes cut DNA at specific sites; PCR amplifies target DNA segments; gel electrophoresis separates DNA fragments by size.
Question 77 of 89
Biotechnology Principles And Processes
In a mixture, DNA fragments are separated by:
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Question 78 of 89
Biotechnology Principles And Processes
In Recombinant DNA technology antibiotics are used:
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Explanation:
In recombinant DNA technology, antibiotics are used as selectable markers. Bacteria that have taken up the recombinant plasmid usually carry an antibiotic resistance gene. When grown on a medium containing the antibiotic, only those cells with the plasmid survive, enabling easy identification of successful transformants.
🧠 Did You Know?
Selectable markers help distinguish cells that have incorporated the desired DNA from those that have not.
💡 NCERT Memory Line:
Antibiotics in the culture medium select only the transformed cells that contain the marker gene.
Question 79 of 89
Biotechnology And Its Applications
RNA interference is used for which of the following
purposes in the field of biotechnology?
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Question 80 of 89
Biotechnology And Its Applications
The laws and rules to prevent unauthorised exploitation of bio-resources are termed as:
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