Class XII · Biology practice
Molecular Basis of Inheritance PYQs Check your understanding, bookmark questions and revisit your mistakes.
Enable JavaScript to check answers and save progress. Stored explanations remain available below.
50 questions in this collection · Page 4 of 5
Molecular Basis Of Inheritance
Identify the statement which is incorrect.
A Sulphur is an integral part of cysteine. B Glycine is an example of lipids. C Lecithin contains phosphorus atom in its structure. D Tyrosine possesses aromatic ring in its structure.
Show explanation
Bookmark
Try again
AI-generated explanation. Check against your textbook.
Explanation: Option 2 is incorrect. Glycine is an amino acid, not a lipid. NCERT classifies glycine as the simplest amino acid with a side chain of hydrogen. Lipids include fats, oils, and phospholipids like lecithin. Options 1, 3, and 4 are correct: sulfur is part of cysteine's thiol group; lecithin is a phospholipid containing phosphorus; tyrosine has an aromatic ring in its side chain.
🧠 Did You Know? Some amino acids contain sulfur (cysteine and methionine), contributing to disulfide bonds and protein structure.
💡 NCERT Memory Line: Amino acids are the building blocks of proteins; lipids include fats and phospholipids like lecithin, which contain phosphorus.
Molecular Basis Of Inheritance
Which is the basis of genetic mapping of human genome as well as DNA finger printing?
A Polymorphism in DNA sequence B Single nucleotide polymorphism C Polymorphism in hnRNA sequence D Polymorphism in RNA sequence
Show explanation
Bookmark
Try again
Request an AI explanation using Show explanation.
Molecular Basis Of Inheritance
Name the enzyme that facilitates opening of DNA
helix during transcription.
A DNA ligase B DNA helicase C DNA polymerase D RNA polymerase
Show explanation
Bookmark
Try again
Request an AI explanation using Show explanation.
Molecular Basis Of Inheritance
Which of the following statements is correct?
A Adenine pairs with thymine through two H-bonds. B Adenine pairs with thymine through one H-bond. C Adenine pairs with thymine through three H-bonds. D Adenine does not pair with thymine.
Show explanation
Bookmark
Try again
Request an AI explanation using Show explanation.
Molecular Basis Of Inheritance
If the distance between two consecutive base pairs
is 0.34 nm and the total number of base pairs of a
DNA double helix in a typical mammalian cell is
6.6×109 bp, then the length of the DNA is
approximately:
A 2.0 meters B 2.5 meters C 2.2 meters D 2.7 meters
Show explanation
Bookmark
Try again
Request an AI explanation using Show explanation.
Molecular Basis Of Inheritance
The first phase of translation is:
A Binding of mRNA to ribosome B Recognition of DNA molecule C Aminoacylation of tRNA D Recognition of an anti-codon
Show explanation
Bookmark
Try again
Request an AI explanation using Show explanation.
Molecular Basis Of Inheritance
The specific palindromic sequence which is
recognized by EcoRI is:
A 5'-GAATTC-3' B 5'-GGAACC-3' C 5'-CTTAAG-3' D 5'-GGATCC-3'
Show explanation
Bookmark
Try again
Request an AI explanation using Show explanation.
Molecular Basis Of Inheritance
Purines found both in DNA and RNA are:
A Adenine and guanine B Adenine and thymine C Guanine and cytosine D Cytosine and thymine
Show explanation
Bookmark
Try again
Request an AI explanation using Show explanation.
Molecular Basis Of Inheritance
Which of the following features of genetic code does allow bacteria to produce human insulin by
recombinant DNA technology?
A Genetic code is not ambiguous B Genetic code is nearly universal C Genetic code is redundant D Genetic code is specific
Show explanation
Bookmark
Try again
Request an AI explanation using Show explanation.
Molecular Basis Of Inheritance
Expressed Sequence Tages (ESTs) refers to:
A Polypeptide expression B DNA polymorphism C Novel DNA sequences D Genes expressed as RNA
Show explanation
Bookmark
Try again
Request an AI explanation using Show explanation.
Page score: 0/40