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

Describe the role of bacterium Thermus aquaticus in carrying the process of polymerase chain reaction.

Answer the following question based on Meselson and Stahl's experiment on E. coli :

Write the name of the chemical substance used as the only source of nitrogen in the experiment.

Name the microbes that help the production of the following product commercially:
Statin

Name the microbes that help the production of the following product commercially:
Penicillin

The first clinical gene therapy was done for the treatment of ________.

How was Insulin obtained before the advent of rDNA technology? What were the problems encountered?

ELISA technique is based on the principles of antigen-antibody interaction. Can this technique be used in the molecular diagnosis of a genetic disorder, such as phenylketonuria?

PCR is a useful tool for early diagnosis of an Infectious disease. Elaborate.

The part of fallopian tube closest to the ovary is ______.

A sac shaped like an upside down pear with a thick lining and muscles in the pelvic area where a fertilized egg or zygote comes to grow into a baby is called ______.

Which of the following is a finger like structure and lies at the upper junction of the two labia minora above the urethral opening?

Identify the odd one from the following.

Where does the ovum receive the sperm?

Egg is liberated from ovary in ______.

Ovulation occurs under the influence of ______.

In 28 days human ovarian cycle, ovulation occurs on ______.

The estrus cycle is a characteristic of ______.

Stratum germinativum is an example of which kind of epithelium?

When both ovaries are removed from rat which hormone is decreased in blood?

Bartholin’s glands are situated ______.