Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

When did Earth originate? Which transformations took place later?

If implementation of better techniques and new strategies are required to provide more efficient care and assistance to people, then why is there a statutory ban on amniocentesis? Write the use of this technique and give reason to justify the ban.

Give functions : Antibiotics

What is meant by the term ‘hot spots’ in biodiversity? List two criteria used for determining a ‘hot spot’. Name two hot spots of India.

1. Identify the polarity of strand in the diagram from a to a', and mention how many more amino acids can be expected to be added to this polypeptide chain.
2. Mention the DNA sequence coding for serine and the anticodon of tRNA for the same amino acid.
3. Why are some untranslated sequence of bases seen in mRNA coding for a polypeptide?

Where exactly are they present on mRNA?

Give reasons : ATP is called energy currency of the cell.

Jayesh, a young married man of 26 years is suffering from T.B. for the last 2 years. He and his wife are desirous of a child but unable to have one, what could be the possible reason? Explain.

You have identified a useful gene in a bacteria. Make a flow chart of the steps that you would follow to transfer this gene to a plant.

What are the unique features of acquired immunity?

Can “fishery” be a sustainable job option?