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Retroviruses have no DNA. However, the DNA of the infected host cell does possess viral DNA. How is it possible?

[4.01] Biotechnology - Principles and Processes
Chapter: [4.01] Biotechnology - Principles and Processes
Concept: Principles of Biotechnology
Appears in 3 question papers

Rearrange the following in the correct sequence to accomplish an important biological reaction:

(a) In vitro synthesis of copies of DNA of interest

(b) Chemically synthesized oligonucleotides

(c) Enzyme DNA-polymerase

(d) Complementary region of DNA

(e) Genomic DNA template

(f) Nucleotides provided

(g) Primers

(h) Thermostable DNA-polymerase (from Thermus aquaticus)

(i) Denaturation of ds-DNA

[4.01] Biotechnology - Principles and Processes
Chapter: [4.01] Biotechnology - Principles and Processes
Concept: Principles of Biotechnology
Appears in 3 question papers

How is 'stratification' represented in a forest ecosystem?

[5.02] Ecosystem
Chapter: [5.02] Ecosystem
Concept: Introduction and Types of Ecosystem
Appears in 2 question papers

Identify 'a' and 'b' in the figure given below representing proportionate number of major vertebrate taxa.

[5.03] Biodiversity and Its Conservation
Chapter: [5.03] Biodiversity and Its Conservation
Concept: Concept of Biodiversity
Appears in 3 question papers

Name the type biodiversity represented by the following: 

(a) 50,000 different strains of rice in India.

(b) Estuaries and alpine meadows in India

[5.03] Biodiversity and Its Conservation
Chapter: [5.03] Biodiversity and Its Conservation
Concept: Concept of Biodiversity
Appears in 1 question paper

State the role of DNA ligase in biotechnology.

[4.01] Biotechnology - Principles and Processes
Chapter: [4.01] Biotechnology - Principles and Processes
Concept: Principles of Biotechnology
Appears in 1 question paper

Explain the work carried out by Cohen and Boyer that contributed immensely in biotechnology.

[4.01] Biotechnology - Principles and Processes
Chapter: [4.01] Biotechnology - Principles and Processes
Concept: Principles of Biotechnology
Appears in 1 question paper

Mention the kind of biodiversity of more than a thousand varieties of mangoes in India represent. How is it possible?

[5.03] Biodiversity and Its Conservation
Chapter: [5.03] Biodiversity and Its Conservation
Concept: Concept of Biodiversity
Appears in 1 question paper

Mention a product of human welfare obtained with the help of each one of the following microbes :
(a) LAB
(b) Saccharomyces cerevisiae
(c) Propionibacterium shermanii
(d) Aspergillus niger

[3.03] Microbes in Human Welfare
Chapter: [3.03] Microbes in Human Welfare
Concept: Introduction of Microbes in Human Welfare
Appears in 3 question papers

Why is reproduction essential for organisms?

[1.01] Reproduction in Organisms
Chapter: [1.01] Reproduction in Organisms
Concept: Introduction of Reproduction in Organisms

What do you think is the significance of reproductive health in a society?

[1.04] Reproductive Health
Chapter: [1.04] Reproductive Health
Concept: Introduction of Reproductive Health

Suggest the aspects of reproductive health which need to be given special attention in the present scenario.

[1.04] Reproductive Health
Chapter: [1.04] Reproductive Health
Concept: Introduction of Reproductive Health

Is sex education necessary in schools? Why?

[1.04] Reproductive Health
Chapter: [1.04] Reproductive Health
Concept: Introduction of Reproductive Health

Do you think that reproductive health in our country has improved in the past 50 years? If yes, mention some such areas of improvement

[1.04] Reproductive Health
Chapter: [1.04] Reproductive Health
Concept: Introduction of Reproductive Health

Group the following as nitrogenous bases and nucleosides:

Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine.

[2.02] Molecular Basis of Inheritance
Chapter: [2.02] Molecular Basis of Inheritance
Concept: Introduction of Molecular Basis of Inheritance

What are the various public health measures, which you would suggest as safeguard against infectious diseases?

[3.01] Human Health and Diseases
Chapter: [3.01] Human Health and Diseases
Concept: Introduction of Human Health and Diseases

In which way has the study of biology helped us to control infectious diseases?

[3.01] Human Health and Diseases
Chapter: [3.01] Human Health and Diseases
Concept: Introduction of Human Health and Diseases

How does the transmission of each of the following diseases take place?

(a) Amoebiasis

(b) Malaria

(c) Ascariasis

(d) Pneumonia

[3.01] Human Health and Diseases
Chapter: [3.01] Human Health and Diseases
Concept: Introduction of Human Health and Diseases

The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:

(a) MALT

(b) CMI

(c) AIDS

(d) NACO

(e) HIV

[3.01] Human Health and Diseases
Chapter: [3.01] Human Health and Diseases
Concept: Introduction of Human Health and Diseases

Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?

[3.03] Microbes in Human Welfare
Chapter: [3.03] Microbes in Human Welfare
Concept: Introduction of Microbes in Human Welfare
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Question Bank Solutions for CBSE (Science) Class 12 CBSE. You can further filter Question Bank Solutions by subjects and chapters. Solutions for most of the questions for CBSE can be found here on shaalaa.com. You can use these solutions to prepare for your studies and ace in exams. Solving questions is a great way to practice and with shaalaa.com, you can answer a question and then also check your answer with the solutions provided.
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