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

Describe the various steps of Griffith’s experiment that led to the conclusion of the 'Transforming Principle'.

How did the chemical nature of the ‘Transforming Principle' get established?

Suggest some methods to assist infertile couples to have children.

State True/False with explanation.

Infertility is defined as the inability to produce a viable offspring and is always due to abnormalities/defects in the female partner.

Correct the following statement:

In E. T. techniques, embryos are always transferred into the uterus.

Compare and contrast the advantages and disadvantages of the production of genetically modified crops.

What is gene therapy? Illustrate using the example of adenosine deaminase (ADA) deficiency.

Diagrammatically represent the experimental steps in cloning and expressing an human gene (say the gene for growth hormone) into a bacterium like E. coli?

Can you suggest a method to remove oil (hydrocarbon) from seeds based on your understanding of rDNA technology and the chemistry of oil?

Consult the internet and find out how to make orally active protein pharmaceuticals. What is the major problem to be encountered?

p² + 2pq + q² = 1. Explain this algebraic equation on the basis of Hardy Weinberg's principle.

State the cause of ADA deficiency in humans.Mention a possible cure for an ADA deficiency patient.

Expand the Given and mention one application of each:

ELISA

With the help of an algebraic equation, how did Hardy-Weinberg explain that in a given population the frequency of occurrence of alleles of a gene is supposed to remain the same through generations?

What is gene therapy? Name the first clinical case in which it was used.

Why does Bt toxin not kill the bacterium that produces it, but kill the insect that ingests it?

Differentiate between a DNA and a RNA nucleotide.

Give a schematic representation of the transformation of a pro-insulin into insulin.

Write any two biochemical/molecular diagonostic procedures for early detection of viral infection. Explain the principle of any one of them.

Describe the steps that are followed during secondary treatment of sewage.