Q1. Which of the following statements is the most appropriate for sickle cell anaemia ?
A) It cannot be treated with iron supplements.
B) It is a molecular disease.
C) It conferes resistance to acquiring malaria
D) All of the above.
Answer: (D) All of the above.
Q2. The first genetic material could be
A) protein
B) cabohydrates
C) DNA
D) RNA
Answer: (D) RNA
The first genetic material could be RNA
Q3. The human chromosome with the highest and least number of genes in them are respectively
A) chromosome 21 and Y
B) chromosome 1 and X
C) chromosome 1 and Y
D) chromosome X and Y
Answer: (C) chromosome 1 and Y
chromosome 1 and Y is the correct answer.
Q4. Who amongst the following scientist had no contribution in the development of the double helix model for the structure of DN A ?
A) Rosalind Franklin
B) Maurice Wilkins
C) Erwin Chargaff
D) Meselson and Stahl
Answer: (B) Maurice Wilkins
Maurice Wilkins contributed in development of double helix model
Q5. Which of the following steps in transcription is catalysed by RNA polymerase ?
A) Initiation
B) Elongation
C) Termination
D) All of the above
Answer: (D) All of the above
All of the above
Q6. Control of gene expression takes place at the level of
A) DNA-replication
B) transcription
C) translation
D) none of the above
Answer: (B) transcription
It takes place at the level of transcription
Q7. Which was the last human chromosome to be completely sequenced ?
A) Chromosome 1
B) Chromosome 11
C) Chromosome 21
D) Chromosome X
Answer: (D) Chromosome X
Chromosome X was the last human chromosome to be completely sequenced
Q8. In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called
A) A โ DNA
B) B โ DNA
C) cDNA
D) rDNA
Answer: (C) cDNA
Such a DNA is called cDNA
Q9. If the sequence of initrogen bases of the coding strand of DNA in a transcription unit is: 5โ โ ATGAATG โ 3โ, the sequence of bases in its RNA transcript would be
A) 5โ โ AUG A AUG โ 3โ
B) 5โ โ UACUU AC โ 3โ
C) 5โ โ CAUUCAU โ 3โ
D) 5โ โ GUAAGUA โ 3โ.
Answer: (D) 5โ โ GUAAGUA โ 3โ.
Sequence will be 5โ โ GUAAGUA โ 3โ.
Q10. The RNA polymerase holocnzyme transcribes
A) the promoter, structural gene and the terminator region
B) the promoter and the terminator region
C) the structural gene and the terminator region
D) the structural gene only.
Answer: (B) the promoter and the terminator region
The RNA polymerase holocnzyme transcribes the promoter and the terminator region
Q11. If the base sequence of a codon in mRNA is 5โ โ AUG โ 3โฒ the sequence of tRNA pairing with it must be
A) 5โ โ UAC โ 3โ
B) 5โ โ CAU โ 3โ
C) 5โ-AUG โ 3โ
D) 5โ โ GUA โ 3โ
Answer: (B) 5โ โ CAU โ 3โ
Q12. The amino acid attaches to the tRNA at its
A) 5โ- end
B) 3โ โ end
C) anticodon site
D) DHUloop.
Answer: (B) 3โ โ end
The amino acid attaches to the tRNA at its 3โ โ end
Q13. To initiate translation, the wiRNA first bind to
A) the smaller ribosomal sub-unit
B) the larger ribosomal sub-unit
C) the whole ribosome
D) no such specificity exists
Answer: (A) the smaller ribosomal sub-unit
bind to the smaller ribosomal sub-unit
Q14. In E. colt, the lac operon gets switched on when
A) lactose is present and it binds to the repressor
B) repressor binds to operator
C) RNA polymerase binds to the operator
D) lactose is present and it binds to RNA polymerase.
Answer: (A) lactose is present and it binds to the repressor
In E. colt, the lac operon gets switched on when lactose is present and it binds to the repressor
Q15. In DNA strand, the nucleotides are linked together by
A) glycosidic bonds
B) phosphodiester bonds
C) peptide bonds
D) hydrogen bonds
Answer: (B) phosphodiester bonds
In DNA strand, the nucleotides are linked together by phosphodiester bonds
Q16. If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it ?
A) 20%
B) 40%
C) 30%
D) 60%
Answer: (C) 30%
30%
Q17. If the sequence of bases in one strand of DNA is ATGCATGCA, what would be the sequence of bases on complementary strand ?
A) ATGCATGCA
B) AUGCAUGCA
C) TACTACGT
D) UACGUACGU
Answer: (C) TACTACGT
The sequence of bases on complementary strand TACTACGT
Q18. How far is each base pair from the next one in DNA double helix model ?
A) 2 nm
B) 3.4 nm
C) 34 nm
D) 0.34 nm
Answer: (D) 0.34 nm
Q19. Synthesis of DNA from RNA is explained by
A) central dogma reverse
B) reverse transcription
C) feminism
D) all of these
Answer: (D) all of these
all of these
Q20. Histone proteins are
A) basic, negatively charged
B) basic, positively charged
C) acidic, positively charged
D) acidic, negatively charged
Answer: (B) basic, positively charged
Histone proteins are basic, positively charged
Q21. The structure in chromatin seen as โbeads-on stringโ when viewed under electron microscope are called
A) nucleotides
B) nucleosides
C) histone octamer
D) nucleosomes
Answer: (D) nucleosomes
seen as โbeads-on stringโ when viewed under electron microscope are called nucleosomes
Q22. Find out the wrong statement about heterochromatin,
A) It is densely packed
B) It stains dark
C) It is transcriptionally active.
D) It is late replicating
Answer: (C) It is transcriptionally active.
Q23. They year 2003 was celebrated as the 50th anniversary of discovery of
A) transposons by Barbare Me Clintock
B) structure of DNA by Watson and Crick
C) Mendelโs laws of inheritance
D) biotechnology by Kary Muliis.
Answer: (B) structure of DNA by Watson and Crick
They year 2003 was celebrated as the 50th anniversary of discovery of structure of DNA by Watson and Crick
Q24. Amino acids which are specified by single codons are
A) phenylalanine and arginine
B) tryptophan and methionine
C) valine and proline
D) methionine and aroinine
Answer: (B) tryptophan and methionine
Amino acids which are specified by single codons are tryptophan and methionine
Q25. Which out of the following statements is incorrect ?
A) Genetic code is ambiguous.
B) Genetic code is deqenerate
C) Genetic code is universal
D) Genetic code is non-overlanning.
Answer: (A) Genetic code is ambiguous.
Genetic code is ambiguous is incorrect.
๐ฅ Video Resources
Molecular Basis of Inheritance | NEET Biology | Live Mock Test | NEET 2020 | Dr. Anand Mani
Molecular Basis of Inheritance | NEET Biology | Live Mock Test | NEET 2020 | Dr. Anand Mani
Molecular basis of inheritance Class 12 neet previous years questions last 33 years Part 1
MOLECULAR BASIS OF INHERITANCE | Most Important Questions For NEET | Prashankaal Series
Class 12 biology Chapter 6 Molecular basis Of Inheritance MCQ, Board exam 2022 Biology
Molecular Basis of Inheritance- MCQ | NCERT Line Questions | Class 12 Boards | Vedantu NEET
Molecular Basis of Inheritance Class 12 | Menti Quiz | NEET Biology Lectures | Vedantu BioTonic
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