Biotechnology and its Applications — BIOLOGY STD 12 Science — Question

1. Write the palindromic nucleotide sequence for the following DNA segment:

5' - GAATTC - 3'

2. Name the restriction endonuclease that recognises this sequence.
3. How are 'sticky ends' produced? Mention their role.

The base sequence in one of the strands of DNA is TAGCATGAT

1. Give the base sequence of its complementary strand.
2. How are these base pairs held together in a DNA molecule?
3. Explain the base complementarity rules. Name the scientist who framed this rule.

find out how to distinguish between: Plasmid DNA and chromosomal DNA

There are many animals that have become extinct in the wild but continue to be maintained in Zoological parks.

1. What type of biodiversity conservation is observed in this case?
2. Explain any other two ways which help in this type of conservation.

What are the various routes by which transmission of human immunodeficiency virus takes place?

Observe the diagram for genetic mapping of human DNA and answer the following questions:

i. Explain DNA polymorphism as the basis of genetic mapping of the human genome.
ii. State the role of VNTR in DNA fingerprinting.

Why do you think the exine should be hard? What is the function of germ pore?

Name any two hormones found in the blood of a pregnant female only.

Predation is usually referred to as a detrimental association. State any three positive roles that a predator plays in an ecosystem.​​​​​​

Nikhil goes with his family for dinner and insists on sitting in the non-smoking area to which his father (who is a heavy smoker) obiects.