Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Biology

An antibiotic resistance gene in a vector usually helps in the selection of ______.

Significance of 'heat shock' method in bacterial transformation is to facilitate ______.

Which of the following steps are catalysed by Taq DNA polymerase in a PCR reaction?

A bacterial cell was transformed with a recombinant DNA molecule that was generated using a human gene. However, the transformed cells did not produce the desired protein. Reasons could be ______.

Which of the following should be chosen for best yield if one were to produce a recombinant protein in large amounts?

How is copy number of the plasmid vector related to yield of recombinant protein?

While doing a PCR, ‘denaturation’ step is missed. What will be its effect on the process?

Do biomolecules (DNA, protein) exhibit biological activity in anhydrous conditions?

Identify and explain steps ‘A’, ‘B’ and ‘C’ in the PCR diagram given below.

Illustrate the design of a bioreactor. Highlight the difference between a flask in your laboratory and a bioreactor which allows cells to grow in a continuous culture system.

A population has more young individuals compared to the older individuals. What would be the status of the population after some years?

Amensalism is an association between two species where ______.

Lichens are association of ______.

Which of the following is a partial root parasite?

Define stenohaline species.

What is the interaction between two species called?

What is commensalism?

What is mycorrhiza?

What is homeostasis?

What are the organisms that feed on plant sap and other plant parts called?