Question Bank [2022] — BIOLOGY STD 12 Science — Question

Explain briefly:
PCR

Thrombocytes/Platelets.

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.

Sketch and label clover leaf model of t-RNA.

From the donor, Zygote is transferred into the fallopian tube of a female, Which type of assisted reproductive technique is this?

Your friend was diagnosed to be suffering from depression. Write any two symptoms that led to this diagnosis. What is its cause?

Give significance: Fertilization membrane.

When we say 'survival of the fittest', does it mean that:

1. Those which are fit only survive.
2. Those that survive are called fit? Comment.

Would you choose an exonuclease while producing a recombinant DNA molecule?

What is the use of Chemical engineering?