NSEB Molecular Basis of Inheritance Question, Practice Set with Solutions

NSEB Molecular Basis of Inheritance section is one of the most important and scoring areas in the National Standard Examination in Biology. It focuses on understanding how genetic information is stored, replicated, and expressed at the molecular level. Questions from this topic are often concept-based and require a clear understanding of DNA, RNA, and protein synthesis rather than rote learning. For aspirants aiming to perform well, practicing a variety of molecular genetics questions and applying concepts to solve MCQs is essential.

NSEB Molecular Basis of Inheritance

The molecular basis of inheritance involves the study of genes at a molecular level. For the NSEB, candidates must move beyond basic definitions and understand the biochemical properties of nucleic acids and the precision of cellular machinery.

Key Focus Areas

• Search for Genetic Material: Understanding the experiments by Griffith, Avery, MacLeod, McCarty, and Hershey-Chase.

• DNA Structure and Packaging: The double-helix model and nucleosome organization.

• The Central Dogma: Detailed steps of replication, transcription, and translation.

• Gene Regulation: The mechanics of the Lac Operon and eukaryotic gene expression.

NSEB Molecular Genetics MCQ

To help students evaluate their preparation, here are several nseb molecular genetics mcq examples that reflect the difficulty level of the Olympiad.

Q1. If there are 10,000 nitrogenous base pairs in DNA, how many nucleotides are present?
(A) 500
(B) 10,000
(C) 20,000
(D) 40,000

Q2. A nucleotide consists of:
(A) Nitrogen base, pentose sugar, and phosphoric acid
(B) Nitrogen, hexose sugar, and phosphoric acid
(C) Nitrogen base and pentose sugar
(D) Nitrogen base, triose sugar, and phosphoric acid

Q3. The prokaryotic genetic system contains:
(A) DNA & histones
(B) RNA & histones
(C) Either DNA or histones
(D) DNA but no histones

Q4. The purine and pyrimidine bases in DNA are held together by:
(A) Hydrogen bonds
(B) Oxygen bonds
(C) Carbon bonds
(D) Nitrogen bonds

Q5. Chargaff’s rule states:
(A) Purines ≠ Pyrimidines
(B) A + G = T + C
(C) A + U = G + C
(D) (A + T)/(G + C) = constant

Q6. If Adenine = 30% in DNA, then Guanine = ?
(A) 40%
(B) 30%
(C) 20%
(D) 70%

Q7. A DNA segment has 80 thymine and 90 guanine bases. Total nucleotides = ?
(A) 160
(B) 40
(C) 80
(D) 340

Q8. A bacterium with radioactive DNA replicates twice in a non-radioactive medium. What % will still contain radioactive DNA?
(A) 100%
(B) 50%
(C) 25%
(D) 12.5%

Q9. Which enzyme joins DNA fragments?
(A) Terminase
(B) Endonuclease
(C) Ligase
(D) DNA polymerase

Q10. Okazaki fragments are formed on:
(A) Leading strand
(B) Lagging strand
(C) Both strands
(D) Complementary DNA

Q11. Copying genetic information from DNA to RNA is called:
(A) Transcription → RNA
(B) RNA → Transcription
(C) DNA → Translation
(D) Replication → RNA

Q12. Correct order of molecular weight:
(A) DNA < rRNA < tRNA
(B) DNA < mRNA < rRNA
(C) tRNA < mRNA < DNA
(D) tRNA < DNA < mRNA

Q13. Start codon for protein synthesis:
(A) AUG
(B) UGA
(C) GUA
(D) UAG

Q14. Anticodons are present in:
(A) mRNA
(B) tRNA
(C) rRNA
(D) All

Q15. Which is NOT produced in the lac operon of E. coli?
(A) β-galactosidase
(B) Transacetylase
(C) Lactose dehydrogenase
(D) Lactose permease

NSEB Molecular Basis of Inheritance Question PDF Download

Below is the PDF link for NSEB Molecular Basis of Inheritance Questions, where you can find a collection of Olympiad-level practice questions based on this topic. This PDF includes a variety of concept-based problems that help you understand DNA, RNA, and gene expression in a better way. You can use it for revision and practice to strengthen your preparation for NSEB and similar competitive exams. 

Download NSEB Molecular Basis of Inheritance Questions PDF

NSEB Genetics Questions Olympiad Preparation Strategy

Preparing for the NSEB Genetics Questions Olympiad requires a shift from rote learning to analytical thinking. Here is a structured approach:

1. Analyze Experimental Evidence: Don't just memorize results; understand the logic behind experimental designs in molecular biology.

2. Focus on NSEB DNA RNA questions: Pay close attention to the differences in stability, catalytic properties, and structural variations between DNA and RNA.

3. Visual Learning: Draw diagrams for replication forks and transcription units to visualize how enzymes like Ligase, Helicase, and Polymerase interact.

4. Practice High-Level Problems: Regularly solve NSEB molecular genetics MCQs to improve your elimination skills during the actual exam.