Class-12 Biology Ch-6 Molecular Basis of Inheritance MCQs Exam 2027 
Class-12 Biology Ch-6 Molecular Basis of Inheritance MCQs Exam 2027 Details: नीचे दिए गए सभी Questions Bihar Board परीक्षा 2027 के लिए “Very Very Important Multiple Choice Questions (MCQs) Objective” (अत्यंत महत्वपूर्ण प्रश्न) हैं। इन सभी Class 12th Biology /जीवविज्ञान ) = जीवविज्ञान भाग-1 (English Medium) Book Chapter-6 Molecular Basis of Inheritance का Questions का Solve का वीडियो Youtube और Website पर Upload किया है।
Biology Important MCQs (Topic-wise Syllabus: 175 Questions)
TOPIC 1: Structure of DNA and Chemical Composition
DNA differs from RNA in having— [2020A]
(A) Presence of Phosphate
(B) Presence of Ribose
(C) Presence of Deoxyribose
(D) Presence of Cytosine
Who provided the X-ray diffraction data of DNA? [2024A]
(A) Maurice Wilkins and Rosalind Franklin
(B) Chargaff
(C) Watson and Crick
(D) Holley
Who proposed the Double Helix model of DNA? [2015A]
(A) Morgan and Mendel
(B) Watson and Crick
(C) Khorana and Nirenberg
(D) Griffith and Hershey
‘Uracil’ is specifically found in? [2012A]
(A) DNA
(B) RNA
(C) Both
(D) None
Which bond is present between the nitrogenous bases of nucleic acids? [2022A]
(A) Peptide bond
(B) Ester bond
(C) Glycosidic bond
(D) Hydrogen bond
DNA and RNA are similar in— [2023A]
(A) Being capable of replication
(B) Having similar sugar
(C) Being polymers of nucleotides
(D) Having similar pyrimidine bases
Deoxyribose and Ribose sugars belong to the same class called— [2022A]
(A) Trioses
(B) Pentoses
(C) Hexoses
(D) Heptoses
Which of the following DNA molecules contains Purine? [2021A]
(A) A and C
(B) C and T
(C) A and G
(D) None of these
Nucleic acid is a strong acid. The reason for its acidity is—
(A) Phosphate
(B) Sugar
(C) Nitrogen base
(D) Hydrogen bond
Which nitrogenous base is absent in DNA?
(A) A
(B) C
(C) T
(D) U
In a DNA molecule, Cytosine always pairs with—
(A) Thymine
(B) Uracil
(C) Guanine
(D) Cytosine
The pyrimidine bases present in DNA are—
(A) Cytosine and Uracil
(B) Adenine and Uracil
(C) Cytosine and Thymine
(D) Adenine and Thymine
In the double helix model of DNA, what is the distance between each base pair?
(A) 34 nm
(B) 3.4 nm
(C) 2 nm
(D) 0.34 nm
The basic unit of a nucleic acid molecule is called—
(A) Nucleoside
(B) Nucleotide
(C) Nitrogenous base
(D) Pentose sugar
The number of hydrogen bonds between Cytosine and Guanine is—
(A) 2
(B) 3
(C) 1
(D) 4
DNA differs from RNA by—
(A) Nitrogenous bases and Sugars
(B) Nitrogenous bases and Phosphate groups
(C) Number of C atoms in sugars
(D) Sugar and Phosphate groups
Pyrimidines found in RNA are— [2021A]
(A) Cytosine and Thymine
(B) Adenine and Guanine
(C) Cytosine and Uracil
(D) Thymine and Uracil
Nucleoside is— [2021A]
(A) Sugar + Nitrogenous base
(B) Sugar + Phosphate
(C) Nitrogenous base + Phosphate
(D) None of these
If Cytosine is 18% in a DNA molecule, what will be the percentage of Adenine? [2021A]
(A) 64%
(B) 36%
(C) 82%
(D) 32%
Which are the pyrimidine bases in DNA? [2016A]
(A) Adenine and Guanine
(B) Cytosine and Thymine
(C) Adenine and Cytosine
(D) Thymine and Guanine
TOPIC 2: DNA Packaging
How many histone molecules are in the core of a nucleosome? [2020A]
(A) 4
(B) 6
(C) 8 (Octamer)
(D) 10
Present in the nucleosome is—
(A) Histone molecule
(B) Nucleotide
(C) Nucleoalbumin
(D) Nuclear pore complex
A typical nucleosome is composed of: [2026]
(A) 200 base pairs of DNA
(B) Histone octamer
(C) Both (A) and (B)
(D) Acidic protein
What is present in the prokaryotic genetic system? [2014A]
(A) Both DNA and Histone
(B) DNA but no Histone
(C) Histone but no DNA
(D) Neither DNA nor Histone
The arrangement of nucleotides in DNA can be seen by— [2022A]
(A) Electron microscope
(B) X-ray crystallography
(C) Light microscope
(D) Ultracentrifuge
In a DNA helix, nucleotides are linked together by—
(A) Glycosidic bond
(B) Phosphodiester bond
(C) Peptide bond
(D) Hydrogen bond
To which carbon of pentose sugar in a nucleoside is the nitrogen base attached?
(A) 1
(B) 2
(C) 3
(D) 5
Which of the following is a nucleotide?
(A) Uridylic acid
(B) Cytosine
(C) Thymidine
(D) Glutamic acid
DNA molecule is anti-parallel due to—
(A) H-bond
(B) Phosphodiester bond
(C) Disulfide bond
(D) None
The number of nucleotides in one spiral of B-DNA is—
(A) 5
(B) 10
(C) 21
(D) 25
If there are 10 spirals in DNA, the length of DNA will be—
(A) 34 Å
(B) 340 Å
(C) 640 Å
(D) 64 Å
What is the diameter of a DNA molecule? [2026]
(A) 10 Å
(B) 20 Å
(C) 34 Å
(D) 2 Å
The method used to test DNA is—
(A) Iodine test
(B) Feulgen reaction
(C) Molisch test
(D) Millon’s reagent
The base pillar of both strands of DNA double helix is made of: [2026]
(A) Sugar-Phosphate
(B) Sugar-Nitrogenous base
(C) Nitrogenous base – Phosphate
(D) Sugar-Phosphate – Nitrogenous base
In one helix of B-DNA spiral, there is— [2019A]
(A) 2nm
(B) 20 nm
(C) 3.4 nm
(D) 34 nm
TOPIC 3: DNA Replication
Which organism was used by Meselson and Stahl to prove the semi-conservative nature of DNA replication? [2018A]
(A) Drosophila
(B) E. coli bacteria
(C) Pea plant
(D) Mouse
On which strand of DNA are ‘Okazaki fragments’ formed? [2021A]
(A) Leading strand
(B) Lagging strand
(C) Both
(D) None of these
When are Okazaki fragments formed? [2020A]
(A) Continuous replication of DNA
(B) Discontinuous replication of DNA
(C) Lagging strand of DNA
(D) Both (B) and (C)
Which statement is false about DNA replication? [2024A]
(A) The main enzyme of DNA replication is DNA polymerase
(B) Any mistake in DNA replication results in mutation
(C) Replication results in mutation due to errors
(D) Replication is continuous on both strands of DNA
DNA fragments are joined by—
(A) Ligase
(B) Polymerase
(C) Helicase
(D) Gyrase
Who discovered DNA polymerase?
(A) Okazaki
(B) Kornberg
(C) Meselson and Stahl
(D) Watson and Crick
In which phase of the cell cycle does DNA replication occur?
(A) $G_1$
(B) S
(C) $G_2$
(D) M
Which enzyme is used to join Okazaki fragments? [2013A]
(A) DNA polymerase
(B) DNA ligase
(C) Helicase
(D) Nuclease
During replication, the unwinding of DNA is done by which enzyme? [2021A]
(A) Topoisomerase
(B) Helicase
(C) DNA polymerase
(D) Primase
In which direction does DNA replication take place? [2026]
(A) 3′ to 5′
(B) 5′ to 3′
(C) In both directions
(D) In any direction
During replication, how is DNA synthesized on the ‘leading strand’? [2026]
(A) Discontinuous
(B) Continuous
(C) In small fragments
(D) In reverse direction
What is the pitch of one helix of DNA? [2026]
(A) 3.4 nm
(B) 0.34 nm
(C) 20 nm
(D) 34 nm
What was the conclusion of Hershey and Chase’s experiment? [2024A]
(A) DNA is the genetic material of bacteria
(B) DNA is the genetic material of viruses
(C) RNA is the genetic material of bacteria
(D) RNA is the genetic material of viruses
Frederick Griffith discovered?
(A) Translocation
(B) Transformation
(C) Transduction
(D) Translation
DNA is the genetic material of which of the following? [2021A]
(A) TMV
(B) Bacteriophage
(C) Both (A) and (B)
(D) None of these
What did Hershey and Chase conclude based on their experiments? [2026]
(A) Protein from virus enters bacteria
(B) DNA from virus enters bacteria
(C) RNA from virus enters bacteria
(D) Transforming principle
Which bacteria was used in Griffith’s experiment? [2026]
(A) E. coli
(B) Streptococcus pneumoniae
(C) Bacillus subtilis
(D) Salmonella
When a separated piece of DNA is kept at 82°-92° C, then— [2022A]
(A) There is no effect
(B) It undergoes denaturation (unwinding)
(C) It divides into a million pieces
(D) It changes into RNA
If the ratio of $(A+T)/(G+C)$ in one strand of a DNA molecule is 0.3, what will be the ratio of $(A+G)/(T+C)$ in the whole DNA?
(A) 0.3
(B) 0.6
(C) 1.2
(D) 1
Which of the following is correct according to Chargaff’s rule?
(A) $A + G = T + C$
(B) $A = C$
(C) $G = T$
(D) $(A+T) / (G+C) = 1$
TOPIC 4: Transcription and RNA
The synthesis of RNA on a DNA template is called— [2018A]
(A) Translation
(B) Transcription
(C) Transduction
(D) Replication
The process of formation of RNA from DNA is called? [2011A/2023A]
(A) Translation
(B) Transcription
(C) Translocation
(D) Mutation
Which form of RNA has a structure like a ‘Clover leaf’? [2023A]
(A) mRNA
(B) rRNA
(C) hnRNA
(D) tRNA
Synthesis of RNA occurs on—
(A) Both strands of DNA
(B) Sense strand of DNA
(C) Complementary strand of DNA
(D) cDNA
During transcription, RNA polymerase binds to which site on DNA?
(A) Promoter
(B) Regulator
(C) Receptor
(D) Acceptor
Termination of transcription is done by? [2021A]
(A) Cobalt gene
(B) Rho-factor
(C) Sigma factor
(D) Catalyst
What is another name for ‘Teminism’? [2026]
(A) Transcription
(B) Reverse Transcription
(C) Translation
(D) Replication
Synthesis of DNA from RNA is defined as—
(A) Central Dogma Reverse
(B) Reverse Transcription
(C) Teminism
(D) All
What is the process of removal of introns and joining of exons called? [2026]
(A) Splicing
(B) Tailing
(C) Capping
(D) Transcription
In eukaryotes, which is involved in the transcription of t-RNA, 5S r-RNA, and Sn-RNA? [2018A]
(A) RNA Polymerase I
(B) RNA Polymerase II
(C) RNA Polymerase III
(D) All of these
RNA Polymerase-III transcribes which of the following? [2026]
(A) mRNA
(B) rRNA
(C) tRNA and 5S rRNA
(D) hnRNA
In which form of RNA is the ‘Anticodon’ found? [2026]
(A) mRNA
(B) rRNA
(C) tRNA
(D) hnRNA
The most abundant RNA found in a cell is—
(A) t-RNA
(B) r-RNA
(C) m-RNA
(D) hn-r-RNA
Which RNA is short-lived?
(A) m-RNA
(B) t-RNA
(C) r-RNA
(D) Sn-RNA
Purines present in RNA are:
(A) Guanine and Adenine
(B) Uracil and Thymine
(C) Adenine and Cytosine
(D) Uracil and Guanine
Which is correct for RNA?
(A) [A] = [U]
(B) [G] = [C]
(C) [A] ≠ [U]
(D) [A] = [G]
Uracil is related to? [2019A]
(A) RNA
(B) DNA
(C) Both (A) and (B)
(D) None of these
RNA is the genetic material of which of the following?
(A) Prokaryotes
(B) Eukaryotes
(C) TMV
(D) E. coli
Which base is present in RNA but not in DNA?
(A) Uracil
(B) Guanine
(C) Cytosine
(D) Thymine
What comes under ‘Central Dogma’? [2021A]
(A) DNA → RNA → Protein
(B) RNA → DNA → Protein
(C) DNA → Protein → RNA
(D) None of these
What is the correct sequence of Central Dogma? [2026]
(A) RNA → DNA → Protein
(B) DNA → RNA → Protein
(C) Protein → RNA → DNA
(D) DNA → Protein → RNA
Where does the process of ‘Transcription’ occur? [2026]
(A) Cytoplasm
(B) Nucleus
(C) Ribosome
(D) Mitochondria
What will be the correct base sequence in DNA for the RNA base sequence ‘AUCGCUGA’? [2020A]
(A) TTGCGGACT
(B) TAGCGACT
(C) UAGCGACU
(D) TAGCCCACT
If the sequence of bases in the coding strand of DNA is ATTCGATG, then the sequence of bases in mRNA will be—
(A) TAAGCTAC
(B) UAAGCUAC
(C) ATTCGATG
(D) AUUCGAUG
Which form of RNA is also called ‘Soluble RNA’? [2016A]
(A) mRNA
(B) rRNA
(C) tRNA
(D) hnRNA
TOPIC 5: Genetic Code and Translation
Which amino acid is coded by the start codon ‘AUG’? [2021A]
(A) Valine
(B) Methionine
(C) Leucine
(D) Alanine
Which of the following is not a termination codon? [2024A]
(A) UAG
(B) UGA
(C) AUG
(D) UAA
Some amino acids are coded by more than one codon. Such a code is called? [2024A]
(A) Unambiguous
(B) Degenerate
(C) Universal
(D) Specific
What is the process of protein synthesis called? [2020A]
(A) Transcription
(B) Translation
(C) Transduction
(D) Transformation
Who proposed the ‘Wobble hypothesis’? [2019A]
(A) Crick
(B) Watson
(C) Nirenberg
(D) Khorana
Where is the genetic code located?
(A) r-RNA
(B) t-RNA
(C) r-DNA
(D) m-RNA
Triplet UUU codes for?
(A) Leucine
(B) Methionine
(C) Phenylalanine
(D) Glycine
If the codon in m-RNA is AAA, what will be its anti-codon?
(A) UUU
(B) AAA
(C) TTT
(D) AUG
To which end of tRNA does the amino acid attach?
(A) 5′ end
(B) 3′ end
(C) TψC loop
(D) DHU loop
Which of the following is a start codon? [2020A]
(A) UAG and UGA
(B) AUG and GUG
(C) UAA and UAG
(D) UAA and UGA
The initiation codon for protein synthesis is?
(A) AUG
(B) GUA
(C) GCA
(D) CCA
Which of the following genetic codes is a ‘Stop codon’? [2026]
(A) AUG
(B) UAA
(C) GUG
(D) UGG
Who carries amino acids to the ribosome during protein synthesis? [2026]
(A) mRNA
(B) tRNA
(C) rRNA
(D) DNA
Which of the following statements is incorrect about the genetic code? [2026]
(A) The codon is triplet
(B) It is unambiguous and specific
(C) It is degenerate
(D) All 64 codons code for amino acids
What is meant by charging of tRNA? [2024A]
(A) Attachment of amino acid to cognate tRNA
(B) Attachment of tRNA to ribosome
(C) Transcription of RNA
(D) Transformation of RNA
A polypeptide chain has 100 amino acids. How many types of proteins can be formed under triplet genetic code?
(A) $20^{100}$
(B) $100^{20}$
(C) $100 \times 20 \times 3$
(D) $100 \times 3$
Out of 64 codons in the genetic code, how many codons code for 20 types of amino acids?
(A) 61
(B) 64
(C) 20
(D) 59
What complementary bond exists between Codon and Anti-codon? [2019A]
(A) Ionic bond
(B) Covalent bond
(C) Hydrogen bond
(D) Phosphodiester bond
Which of the following RNA is the smallest in protein synthesis? [2018A]
(A) m-RNA
(B) r-RNA
(C) t-RNA
(D) hn-RNA
During translation, with whose help do amino acids read the code on mRNA? [2026]
(A) rRNA
(B) tRNA
(C) DNA
(D) Enzymes
What are Transposons called?
(A) Split gene
(B) Mobile genetic element
(C) Jumping gene
(D) Both (B) and (C)
Who discovered ‘Jumping Genes’ in maize? [2015A]
(A) Hugo de Vries
(B) T. H. Morgan
(C) Barbara McClintock
(D) Mendel
In sickle cell anaemia, glutamic acid is replaced by which amino acid? [2017A]
(A) Alanine
(B) Valine
(C) Leucine
(D) Serine
In gene mutation, Adenine is replaced by Guanine, this is—
(A) Frame-shift mutation
(B) Transversion
(C) Transcription
(D) Transition
A DNA segment that reads the same forwards and backwards is called—
(A) Palindromic DNA
(B) Repetitive DNA
(C) Plasmid DNA
(D) Copy DNA
Why was H.G. Khorana awarded the Nobel Prize?
(A) For discovery of DNA
(B) For discovery of RNA
(C) For chemical synthesis of gene
(D) For discovery of DNA polymerase
Restriction endonucleases recognize a specific sequence in DNA— [2018A]
(A) Palindromic nucleotide sequences
(B) VNTR
(C) Mini satellite
(D) All of these
GAATTC is the recognition site for which restriction endonuclease? [2018A]
(A) Hind III
(B) Eco RI
(C) Bam I
(D) Hae III
Where does the process of Translation occur?
(A) Nucleus
(B) Cytoplasm
(C) Mitochondria
(D) Lysosome
Where are anti-codons found? [2021A]
(A) In mRNA
(B) In tRNA
(C) In rRNA
(D) None of these
TOPIC 6: Gene Expression and Regulation (Lac Operon)
What does the Operon model represent? [2021A]
(A) Gene synthesis
(B) Gene expression
(C) Gene regulation
(D) Gene function
What is the role of ‘y’ gene in Lac Operon? [2024A]
(A) Coding for Beta-galactosidase
(B) Coding for Permease
(C) Coding for Repressor gene
(D) Coding for Transacetylase
Control of gene expression occurs at which level? [2023A]
(A) Transcription
(B) Translation
(C) DNA replication
(D) Both (A) and (B)
Lac Operon is a representative of? [2019A]
(A) Inducible gene machinery
(B) Repressible gene machinery
(C) Housekeeping gene structure
(D) All of these
During expression of Operon, RNA polymerase binds to?
(A) Structural gene
(B) Operator gene
(C) Regulator gene
(D) Promoter gene
Constantly active genes are—
(A) Gene battery genes
(B) Luxury genes
(C) Housekeeping genes
(D) Mild genes
Who proposed the Operon model? [2021A]
(A) Watson and Crick
(B) Nirenberg
(C) Jacob and Monod
(D) None of these
How many structural genes are found in Lac Operon? [2022A]
(A) One (z)
(B) Two (z, y)
(C) Three (z, y, a)
(D) Four (z, y, a, i)
Who acts as ‘Inducer’ in Lac Operon? [2022A]
(A) Glucose
(B) Lactose
(C) Galactose
(D) Fructose
Which enzyme causes lactose to enter the bacterial cell? [2026]
(A) Beta galactosidase
(B) Permease
(C) Transacetylase
(D) Lactase
What is the ‘Regulator gene’ of the Operon model called? [2026]
(A) Structural gene
(B) Inhibitor (i) gene
(C) Operator gene
(D) Promoter gene
In ‘Lac Operon’, the ‘z’ gene codes for? [2026]
(A) Permease
(B) Transacetylase
(C) Beta-galactosidase
(D) Repressor protein
Regulation of gene expression occurs at which level?
(A) Transcription
(B) Processing/Splicing
(C) Translation
(D) All
Expression of any gene is edited by which of the following? [2018A]
(A) Small interfering RNA (RNAi)
(B) Anti-sense RNA
(C) Both A and B
(D) None of these
Which enzyme allows lactose to enter bacterial cells? [2026]
(A) Beta galactosidase
(B) Permease
(C) Transacetylase
(D) Lactase
Which enzyme causes lactose to enter the bacterial cell? [2026]
(A) Beta galactosidase
(B) Permease
(C) Transacetylase
(D) Lactase
‘Housekeeping’ genes are those which:
(A) Work occasionally
(B) Are always active in the cell
(C) Work only during division
(D) Work on external stimulus
Which model is most famous for gene regulation in prokaryotes?
(A) Tatum model
(B) Operon model
(C) Crick model
(D) Mendel model
The Repressor protein binds to what to stop gene expression?
(A) Promoter
(B) Operator
(C) Regulator
(D) Structural gene
The binding site of RNA polymerase is called:
(A) Operator
(B) Promoter
(C) Intron
(D) Codon
TOPIC 7: Human Genome Project and DNA Fingerprinting
Who developed the technique of DNA Fingerprinting? [2017A]
(A) Wilkins
(B) Alec Jeffreys
(C) Watson
(D) Khorana
When did the Human Genome Project (HGP) start? [2015A]
(A) 1980
(B) 1990
(C) 2000
(D) 1995
What is the basis of DNA fingerprinting? [2022A]
(A) Single nucleotide polymorphism
(B) DNA polymorphism
(C) Quantity of RNA
(D) Quantity of protein
Satellite DNA is a useful tool for— [2023A]
(A) Sex determination
(B) Organ culture
(C) Forensic science
(D) Tissue culture
The human genome is composed of approximately how many base pairs?
(A) $3 \times 10^9$ bp
(B) $6 \times 10^9$ bp
(C) 20000 – 30000 bp
(D) $2.2 \times 10^4$ bp
The total estimated number of genes in humans is—
(A) 3000
(B) 80,000
(C) 30,000
(D) $3 \times 10^9$
Human chromosomes containing the highest and lowest number of genes respectively are?
(A) Chromosome 21 and Y
(B) Chromosome 1 and X
(C) Chromosome 1 and Y
(D) Chromosome X and Y
What is the function of DNA fingerprinting? [2016A]
(A) Identification of true parents of offspring
(B) Identification of criminals in forensic labs
(C) Obtaining information about suspected parents
(D) All of these
What is the full form of ‘VNTR’ in DNA fingerprinting? [2026]
(A) Variable Number of Tandem Repeats
(B) Various Number of Tandem Repeats
(C) Variable Nucleotide Tandem Repeats
(D) Variable Nucleotide Triple Repeats
According to HGP, total nitrogen base pairs in a human cell are? [2026]
(A) $3 \times 10^9$
(B) $6 \times 10^9$
(C) $2 \times 10^9$
(D) $3 \times 10^6$
In which field is DNA Fingerprinting used? [2026]
(A) Forensic Science
(B) Paternity testing
(C) Checking genetic diversity
(D) All of these
How many sets of chromosomes are there in the human genome?
(A) 23
(B) 46
(C) 22
(D) 1
Which radioactive substance is used as a probe in DNA Fingerprinting?
(A) P-32
(B) S-35
(C) C-14
(D) H-3
Which is the largest known human gene?
(A) Insulin gene
(B) Dystrophin
(C) Haemoglobin gene
(D) Oncogene
What was the Human Genome Project called?
(A) Mini Project
(B) Mega Project
(C) Micro Project
(D) Nano Project
TOPIC 8: Genetics, Evolution and Disorders
How many chromosomes are in Turner’s syndrome? [2020A]
(A) 45
(B) 46
(C) 47
(D) None of these
In which stage does crossing-over occur? [2021A]
(A) Leptotene
(B) Cytokinesis
(C) Pachytene
(D) Diakinesis
If a person’s blood group is AB, what will be their genotype? [2026]
(A) $I^AI^A$
(B) $I^Bi$
(C) $I^Ai$
(D) $I^AI^B$
If a plant’s genotype is AaBbCc, how many types of gametes will be formed? [2026]
(A) Two
(B) Four
(C) Eight
(D) Sixteen
Which of these is not a chromosomal disorder? [2026]
(A) Klinefelter’s syndrome
(B) Turner’s syndrome
(C) Down’s syndrome
(D) Haemophilia
In which animal does sex determination depend on the number of sets of chromosomes? [2026]
(A) Birds
(B) Honeybees
(C) Grasshoppers
(D) Mammals
Which rule is based on monohybrid cross? [2026]
(A) Law of dominance
(B) Law of segregation
(C) Law of independent assortment
(D) Both (A) and (B)
In which type of rocks are fossils found? [2026]
(A) Sedimentary rock
(B) Metamorphic rock
(C) Igneous rock
(D) All of these
Which are examples of homologous organs in animals? [2026]
(A) Eyes of octopus and human
(B) Sweet potato and potato
(C) Flippers of penguins and dolphins
(D) Heart of reptiles and mammals
Who among these was most like an ape? [2026]
(A) Dryopithecus
(B) Ramapithecus
(C) Homo erectus
(D) Australopithecus
Which of these is the most resistant organic material? [2026]
(A) Pectin
(B) Cellulose
(C) Sporopollenin
(D) Chitin
Which gases did Miller use in his experiment? [2026]
(A) $CH_4, NH_3, H_2, H_2O$
(B) $O_2, CO_2, N_2, H_2$
(C) $CH_4, O_2, N_2$
(D) None of these
If a person’s blood group is AB, what would be his/her genotype? [2026]
(A) $I^A I^A$
(B) $I^B i$
(C) $i i$
(D) $I^A I^B$
How many types of gametes would be formed if the genotype of plant is AaBbCc? [2026]
(A) Two
(B) Four
(C) Eight
(D) Sixteen
Which of the following is not a chromosomal disorder? [2026]
(A) Klinefelter’s syndrome
(B) Turner’s syndrome
(C) Down’s syndrome
(D) Haemophilia
In which animal does sex determination depend on the number of chromosome sets? [2026]
(A) Birds
(B) Honeybees
(C) Grasshoppers
(D) Mammals
Which of the following laws is based on monohybrid cross? [2026]
(A) Law of dominance
(B) Law of segregation
(C) Law of independent assortment
(D) Both (A) and (B)
Fossils are found in which type of rocks? [2026]
(A) Sedimentary rock
(B) Metamorphic rock
(C) Igneous rock
(D) All of these
Which of the following are examples of homologous organs in animals? [2026]
(A) Eyes of octopus and human
(B) Sweet potato and potato
(C) Flippers of penguins and dolphins
(D) Heart of reptiles and mammals
Which of the following was more like ape? [2026]
(A) Dryopithecus
(B) Ramapithecus
(C) Homo erectus
(D) Australopithecus
Who discovered nuclear transplantation technique? [2023A]
(A) Griffith
(B) Gurdon
(C) Briggs
(D) Ian Wilmut
What do analogous organs represent?
(A) Convergent Evolution
(B) Divergent Evolution
(C) Parallel Evolution
(D) None of these
What was the atmosphere of Earth like at the time of origin of life?
(A) Oxidizing
(B) Reducing
(C) Neutral
(D) Very cold
Darwin’s Finches are an example of?
(A) Adaptive Radiation
(B) Mutation
(C) Isolation
(D) Mutualism
‘Oparin-Haldane’ theory is related to?
(A) Genetics
(B) Chemical origin of life
(C) Evolution
(D) Ecology
Who is the closest relative of humans?
(A) Gorilla
(B) Chimpanzee
(C) Gibbon
(D) Monkey
Down’s Syndrome is caused by?
(A) Trisomy of 21st chromosome
(B) Trisomy of 18th chromosome
(C) Deficiency of X chromosome
(D) Excess of Y chromosome
What kind of disease is Sickle Cell Anaemia?
(A) Sex-linked
(B) Autosomal recessive
(C) Autosomal dominant
(D) None of these
What is the genetic makeup of Klinefelter’s Syndrome?
(A) XO
(B) XXY
(C) XYY
(D) XXX
What is the exception to Mendel’s Law of Independent Assortment?
(A) Linkage
(B) Dominance
(C) Segregation
(D) Incomplete Dominance
Bihar Board Class 12th के (Biology/जीवविज्ञान ) = जीवविज्ञान ‘भाग-1 (Englsih Medium) Book Chapter- 6 Molecular Basis of Inheritance के Exam 2027 MCQs Questions Answer Key
| Q.No. | Ans | Q.No. | Ans | Q.No. | Ans | Q.No. | Ans |
| 1 | (C) | 45 | (B) | 89 | (B) | 133 | (B) |
| 2 | (A) | 46 | (B) | 90 | (B) | 134 | (C) |
| 3 | (B) | 47 | (A) | 91 | (A) | 135 | (A) |
| 4 | (B) | 48 | (B) | 92 | (B) | 136 | (C) |
| 5 | (D) | 49 | (B) | 93 | (B) | 137 | (C) |
| 6 | (C) | 50 | (B) | 94 | (D) | 138 | (D) |
| 7 | (B) | 51 | (B) | 95 | (A) | 139 | (A) |
| 8 | (C) | 52 | (B) | 96 | (A) | 140 | (A) |
| 9 | (A) | 53 | (B) | 97 | (A) | 141 | (D) |
| 10 | (D) | 54 | (D) | 98 | (C) | 142 | (D) |
| 11 | (C) | 55 | (A) | 99 | (C) | 143 | (A) |
| 12 | (C) | 56 | (B) | 100 | (B) | 144 | (B) |
| 13 | (D) | 57 | (B) | 101 | (D) | 145 | (B) |
| 14 | (B) | 58 | (D) | 102 | (C) | 146 | (A) |
| 15 | (B) | 59 | (B) | 103 | (B) | 147 | (C) |
| 16 | (A) | 60 | (A) | 104 | (D) | 148 | (D) |
| 17 | (C) | 61 | (B) | 105 | (A) | 149 | (C) |
| 18 | (A) | 62 | (B) | 106 | (C) | 150 | (D) |
| 19 | (D) | 63 | (B) | 107 | (A) | 151 | (B) |
| 20 | (B) | 64 | (A) | 108 | (B) | 152 | (D) |
| 21 | (C) | 65 | (C) | 109 | (B) | 153 | (A) |
| 22 | (A) | 66 | (C) | 110 | (B) | 154 | (D) |
| 23 | (C) | 67 | (C) | 111 | (C) | 155 | (A) |
| 24 | (B) | 68 | (B) | 112 | (B) | 156 | (C) |
| 25 | (B) | 69 | (A) | 113 | (D) | 157 | (A) |
| 26 | (B) | 70 | (A) | 114 | (A) | 158 | (D) |
| 27 | (A) | 71 | (C) | 115 | (D) | 159 | (C) |
| 28 | (A) | 72 | (A) | 116 | (C) | 160 | (D) |
| 29 | (B) | 73 | (C) | 117 | (C) | 161 | (B) |
| 30 | (B) | 74 | (A) | 118 | (C) | 162 | (D) |
| 31 | (B) | 75 | (A) | 119 | (B) | 163 | (A) |
| 32 | (B) | 76 | (B) | 120 | (B) | 164 | (D) |
| 33 | (B) | 77 | (B) | 121 | (B) | 165 | (A) |
| 34 | (A) | 78 | (B) | 122 | (C) | 166 | (B) |
| 35 | (C) | 79 | (D) | 123 | (D) | 167 | (A) |
| 36 | (B) | 80 | (C) | 124 | (C) | 168 | (B) |
| 37 | (B) | 81 | (B) | 125 | (B) | 169 | (A) |
| 38 | (D) | 82 | (C) | 126 | (B) | 170 | (B) |
| 39 | (D) | 83 | (B) | 127 | (B) | 171 | (B) |
| 40 | (A) | 84 | (B) | 128 | (B) | 172 | (A) |
| 41 | (B) | 85 | (A) | 129 | (B) | 173 | (B) |
| 42 | (B) | 86 | (D) | 130 | (B) | 174 | (B) |
| 43 | (B) | 87 | (C) | 131 | (B) | 175 | (A) |
| 44 | (B) | 88 | (A) | 132 | (B) |
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