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12th Standard English Medium Biology (Zoology) Subject Molecular Genetics Creative 2 Mark Questions with Solution Part - I updated Creative Questions

Published on: 13/05/2022

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Std: 12th Standard - Biology

chapter: - Creative Questions

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Questions:

Generic 2

5 x 2 = 10

What are SNPs? Mention its uses.

Expand (a) ETS and (b) YAC.

What is TATA box? State its function

What is base pair rule?

Why is the term nucleic acid used for DNA and RNA?

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Answers Key:

Generic 2

5 x 2 = 10

SNPs: Single nucleotide polymorphism. It helps to find chromosomal locations for disease associated sequences and tracing human history.

ETS: Expressed Sequence Tags
YAC: Yeast Artificial Chromosomes

In eukaryotes, the promoter has AT rich regions called TATA box or Goldberg-Rogness box. It acts as a binding site for RNA polymerase.

Erwin Chargaff changes observed that in DNA, Adenine pairs with Thymine (A = T) with two hydrogen bonds and Guanine pairs with Cytosine (G ☰ C) with three hydrogen bonds.
The ratios between Adenine with Thymine and Guanine with Cytosine are constant and equal. This base pairing gives a unique property to DNA.

The phosphate functional group (PO₄) present in DNA and RNA gives the property of an acid (releasing H⁺ ion or proton in solution) at physiological pH. Hence the name nucleic acid.