Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

(i) A blood test reported negative for hCG. What does negative hCG imply? Name the tissue which produces hCG?
(ii) If a blood test reported positive for hCG in a person, then which other hormones would also be secreted by the tissue secreting hCG?

How are flowers important for human beings?

A new type of drug, PTC 124, enables translation to continue through the nonsense codon. Trials in mice homozygous for a CFTR allele containing the nonsense codon have found that animals treated with PTC 124 produce normal CFTR protein in their cells. The drug is taken orally and is readily taken up into cells all over the body.
Using your knowledge of the progress towards successful gene therapy for cystic fibrosis, suggest why PTC 124 could be simpler and more reliable treatment for this disease.

Mention four significant services that a healthy forest ecosystem provide.

What are the major functions of male accessory ducts and glands?

Put these statements in the proper order, by rearranging the letters, to describe Darwin's theory of natural selection-

1. The end result of organic evolution is many different species, each adapted to specific environments.
2. Many more individuals are produced each generation that can survive and reproduce.
3. Gradually, over long periods of time, a population can become well adapted to a particular environment.
4. There are inheritable variation among the members of a population.
5. Individuals with adaptive characteristics are more likely to be selected to reproduce by the environment.

Why is Agrobacterium tumifaciens a good cloning vector? Explain.

What is endosperm? Describe free nuclear and cellular type of endosperms.

Where does fertilisation normally take place in a human female?

How do microbes reduce the environmental degradation caused by chemicals?